Beamline Equipment Protection System (BLEPS)

BLEPS (Beamline Equipment Protection System) is the PLC-based safety and interlock system used at the APS to protect beamline hardware — optics, vacuum components, water-cooled stops — from physical damage during user experiments. It continuously monitors the operating state of every protected component and, if any of them deviates from its safe envelope, either warns staff or trips a Fault condition that automatically closes the main beamline shutters to block the X-ray beam.

BLEPS protects equipment; the Personnel Safety System (PSS) protects people. The two are distinct but cooperate — a BLEPS fault asks the PSS-controlled shutter chain to close. PSS is the authoritative safety layer for people-in-hutch interlocks; BLEPS is the layer between PSS and the wear-and-tear of the hardware.

What BLEPS monitors

Typical quantities continuously read by the PLC and compared against component-specific limits:

• Water flow on every water-cooled element (mirror, DMM, slits, filters, white-beam stops, beam-defining masks).

• Vacuum pressure at every gauge along the front end and the beamline transport.

• Component temperatures (thermocouples on optics, mirror tank, monochromator crystals, etc.).

• Position / state of valves, masks, and shutters relevant to equipment protection (gate-valve open/closed, mask in/out).

Each input has a Warning threshold (notify staff, scan continues) and a Fault threshold (close shutters, latch the fault until manually cleared).

Response to a fault

When a Fault threshold is crossed, BLEPS:

1. Latches the fault on the PLC and propagates it to the PSS shutter chain.

2. Closes the main 2-BM beamline shutters — the A-shutter (front-end) and the P6-50 safety shutter / B_shutter further downstream — to block the X-ray beam. See the per-shutter blocks in Beamline components for PV names and command surfaces.

3. Surfaces the latched fault on the BLEPS MEDM / operator screen so staff can identify the root cause before clearing.

The fault is latched — the shutters do not re-open automatically when the offending parameter returns to normal. A staff member must verify the underlying condition, acknowledge the fault on the BLEPS panel, and then re-arm the shutter chain.

2-BM implementation

The full 2-BM-specific BLEPS implementation — interlock matrix (which inputs trip which outputs), PLC programme, MEDM screens, fault-recovery procedure — is documented in:

2-BM BLEPS implementation.

That document is the source of truth for the 2-BM interlock configuration. This page is the conceptual overview only.

Physical assignments at 2-BM

The Excel transfer table refers to the gate valves, mirror thermocouples and water-flow loops only by numeric index (GV1/GV2/GV3, Temp1/Temp2/Temp3, Flow1..``Flow8``). The physical device each index refers to is configured in the PLC and is not stored in the transfer table — it is read off the 2 BMBLEPS Allen-Bradley operator panel, which surfaces Flow1-Flow5 / Temp1-Temp3 / GV1 / GV2 on the Station A page and Flow6-Flow8 / GV3 on the Station B page. The mapping below is taken from those screens.

Gate valves — location in beam direction

Tag	Physical location
GV1	Between the upstream Slits (downstream of the BIV) and the M1 mirror tank. Isolates the mirror tank from the front-end side.
GV2	Between Windows 2 & 3 (downstream end of the Station A optics enclosure) and the SBS (Station B Shutter). Isolates the Station A optics enclosure from the transport to Station B.
GV3	Between the transport pipe coming from Station A and the Station B optics (Station B entrance slits and Window 4). Isolates Station B from the transport.

Mirror tank thermocouples

All three Temp channels are thermocouples on the M1 mirror tank; the index maps top-to-bottom on the tank:

Tag	Physical location
Temp1	M1 mirror tank — Lower thermocouple.
Temp2	M1 mirror tank — Middle thermocouple.
Temp3	M1 mirror tank — Upper thermocouple.

Water-flow loops

Each Flow channel monitors the cooling-water flow through one group of water-cooled components:

Tag	Cooled components
Flow1	Filter assembly and upstream Slits.
Flow2	M1 mirror tank and the DMM (Double Multilayer Monochromator).
Flow3	Window 1 and the Missteer Mask.
Flow4	Windows 2 & 3.
Flow5	White Beam Mask and the SBS (Station B Shutter).
Flow6	Station B entrance slits.
Flow7	Window 4 (Station B).
Flow8	Station B Photon Stop.

EPICS IOC

The 2-BM BLEPS PLC surfaces its state to EPICS via a soft IOC running on the beamline server arcturus under the 2bmb account. Every 2bmBLEPS: PV documented in the inventory below comes from this IOC.

Deployment

IOC directory:

/net/s2dserv/xorApps/epics/synApps_6_3/ioc/2bmBLEPS

Host:

arcturus

Account:

2bmb

PV prefix:

2bmBLEPS: (BLEPS-domain PVs live under 2bmBLEPS:BLEPS:*)

Framework:

synApps 6.3 — standard iocBoot/ + 2bmBLEPSApp/ layout, with 2bmBLEPSApp/op/ui holding the caQtDM screens.

PV count:

599 total — 385 in the BLEPS domain, 214 IOC-admin (heartbeat / CA statistics from iocAdminSoft).

Starting the IOC

The IOC is a synApps soft IOC. Two equivalent ways to start it.

Via the wrapper script (recommended — opens a new gnome-terminal tab and follows the beamline convention of one tab per running IOC):

~/bin/bleps_IOC.sh

The wrapper ssh’s to 2bmb@arcturus and invokes the softioc launcher.

Directly (when logged in as 2bmb@arcturus):

cd /net/s2dserv/xorApps/epics/synApps_6_3/ioc/2bmBLEPS/iocBoot/ioc2bmBLEPS/softioc
./2bmBLEPS.pl run

The IOC runs in the foreground of that terminal and prints its startup output. Leave the terminal open for the duration of the session; closing it kills the IOC.

Stopping the IOC

Two equivalent ways.

Via the wrapper script:

~/bin/bleps_IOC_stop.sh

which calls kill_IOC.sh 2bmBLEPS on arcturus.

Directly (as 2bmb@arcturus):

kill_IOC.sh 2bmBLEPS

Or, from the IOC’s own terminal, Ctrl-C.

MEDM status summary

The bleps_status.adl screen (see figure below) shows the operationally-relevant BLEPS state on a single page. It is the day-to-day interface for on-shift operators.

Launch it with:

medm -x -macro "P=2bmBLEPS:" /home/beams/2BMB/bin/bleps_status.adl

The figure above shows the running screen with a real snapshot of the beamline. Reading top to bottom, left to right:

Top row — ALARMS + SHUTTERS. Grey / coloured indicators for FAULT (grey when clear, red when latched), TRIP (grey / orange), WARNING (grey / yellow), and the BIV / FES / SBS shutter states (green = open, red = closed). Two message-button widgets — Reset FAULT and Reset TRIP — write 1 to A_FAULT_RESET / TRIP_RESET respectively. These clear the corresponding latches on the PLC; the underlying condition must have cleared first or the latch immediately re-arms. There is no dedicated WARNING_RESET PV — latched warnings can only be cleared by the physical BLEPS panel button (or, in some PLC configurations, by A_FAULT_RESET cascading).

Gate valves. GV1 / GV2 / GV3 open / closed limit-switch readbacks, labelled with the physical location each isolates (Slits ↔ M1, Windows 2&3 ↔ SBS, Transport ↔ Station B).

M1 mirror tank temperatures. Three thermocouple readings (TEMP1..``TEMP3``, lower / middle / upper on the tank) with their trip-high limits. A fault is raised when the reading rises above the setpoint.

Cooling water flows. Eight flow readings (FLOW1..``FLOW8``) with their trip-floor setpoints, labelled with the cooled components (filter/slits, M1/DMM, Window 1 & Missteer Mask, Windows 2&3, White Beam Mask / SBS Shutter, Station B slits, Window 4, Station B Photon Stop). A fault is raised when the reading falls below the setpoint.

Vacuum monitoring. Seven ion-pump indicators (IP1..``IP7``) and eight ion-gauge indicators (IG1..``IG8``) as compact coloured boxes. Three-state colouring:

• green — IPx_STATUS / IGx_STATUS = GOOD and no warning latched (all clear).

• yellow — device recovered, but IPx_WARNING / IGx_WARNING is still latched (needs a reset).

• red — _STATUS = BAD right now (overrides yellow).

In the screenshot, IP2 and the odd-numbered ion gauges IG1 / IG3 / IG5 / IG7 show red — four odd-numbered channels being simultaneously BAD usually points to a common controller-side issue rather than four independent failures, and is worth investigating on the physical side.

IOC row (bottom). A red Stop and a yellow BLEPS IOC start button invoke ~/bin/bleps_IOC_stop.sh / ~/bin/bleps_IOC.sh in a new gnome-terminal tab on the calling host, so operators can recycle the IOC without leaving the MEDM screen.

Reference — temperature and flow PVs shown on the summary. The Current and Trip limit columns are backed by the following PVs (all under the 2bmBLEPS:BLEPS: prefix).

Channel	Location / cooled components	Current value PV	Trip limit PV
Temp1	M1 mirror tank — Lower thermocouple	TEMP1_CURRENT	TEMP1_SET_POINT
Temp2	M1 mirror tank — Middle thermocouple	TEMP2_CURRENT	TEMP2_SET_POINT
Temp3	M1 mirror tank — Upper thermocouple	TEMP3_CURRENT	TEMP3_SET_POINT
Flow1	Filter / Slits	FLOW1_CURRENT	FLOW1_SET_POINT
Flow2	M1 Mirror / DMM	FLOW2_CURRENT	FLOW2_SET_POINT
Flow3	Window 1 / Missteer Mask	FLOW3_CURRENT	FLOW3_SET_POINT
Flow4	Windows 2 & 3	FLOW4_CURRENT	FLOW4_SET_POINT
Flow5	White Beam Mask / SBS Shutter	FLOW5_CURRENT	FLOW5_SET_POINT
Flow6	Station B entrance slits	FLOW6_CURRENT	FLOW6_SET_POINT
Flow7	Window 4 (Station B)	FLOW7_CURRENT	FLOW7_SET_POINT
Flow8	Station B Photon Stop	FLOW8_CURRENT	FLOW8_SET_POINT

Temperature trip limits are high setpoints (a fault is raised when the reading rises above the setpoint); flow trip limits are low setpoints (a fault is raised when the reading falls below the setpoint). The top-row status latches (A_FAULT_EXISTS, A_TRIP_EXISTS, WARNING_EXISTS), the shutter closed-status inputs (BIV_CLOSED, FES_CLOSED, SBS_CLOSED) and the gate-valve limit switches (GVx_OPENED_LS / GVx_CLOSED_LS) are documented under the Faults, Inputs and Outputs tables below.

Full caQtDM panel

The support-supplied bleps_all.ui screen (see figure below) surfaces every BLEPS channel: shutters, per-cause gate-valve fault flags, ion pumps and gauges, vacuum sections, flows, temperatures, and the trip / fault / warning FIFOs (10-entry history with timestamps). It is the diagnostics interface — use it to identify the specific channel that latched a warning and to acknowledge / reset faults that the MEDM buttons don’t cover.

Launch it with the wrapper shipped by the IOC:

/net/s2dserv/xorApps/epics/synApps_6_3/ioc/2bmBLEPS/start_caQtDM_2bmBLEPS

The wrapper exports P=2bmBLEPS: as the UI macro and opens bleps_all.ui by default. Optional positional arguments:

• first argument: alternate .ui filename (jumps directly to a sub-panel — e.g. bleps_top.ui for the top-level index).

• second argument: macro string override (defaults to P=2bmBLEPS:).

The figure above shows the panel with the same beamline snapshot as the MEDM summary. Notable groups, left to right:

Shutters (top-left). Beamline Iso, Front End, Station B — each with a state indicator, a Failed to Close alarm indicator, and explicit Close / Open command buttons that write to BIV_PERMIT / FES_PERMIT / SBS_PERMIT.

Gate Valves (below Shutters). One column per GV1 / GV2 / GV3 listing every per-cause fault the PLC tracks (Fault, No Switch, Opened Switch, Closed Switch, Both Switch, Fail to Open / Fully Open, Fail to Close / Fully Close, Beam Exposure) plus Close / Open command buttons wired to the GVx_EPICS_CLOSE / GVx_EPICS_OPEN PVs.

Flows (centre). Eight water-flow tiles, each with the current reading, the trip-floor setpoint, and the scaling factor (raw counts → gpm calibration).

Temps (centre-right). Three M1 mirror-tank thermocouples, each with the current value, trip-high setpoint, and an Over Range indicator.

Ion Pumps / Ion Gauges (top-right). One row per channel with independent Status (device health) and Warn (latched warning) indicators. In the screenshot the four odd-numbered gauges (IG1 / IG3 / IG5 / IG7) show red on both columns — the same pattern surfaced on the MEDM summary.

Vac. Sections (right). Seven vacuum-section trip indicators (VS1..``VS7``), all green in the screenshot.

Trip / Fault / Warning Stacks (bottom). 10-entry FIFOs of recent events with fault number, timestamp, and date. Reset Trips and Reset Faults buttons at the top of the Trip and Fault stacks are the caQtDM equivalents of the MEDM summary’s message buttons. There is no dedicated Reset Warnings button — the Warning stack drains as its underlying conditions clear (or via the physical BLEPS panel button).

BLEPS PV inventory (2-BM)

The Excel transfer table that defines the 2-BM BLEPS PLC tag set contains one worksheet per logical class of signals (FIFOs, Faults, Trips, Warnings, Info, Flows, Temps, Inputs, Outputs, Display, EPICS_Inputs). Each row has a Used flag that marks whether the row is in the deployed configuration; the subsections below reproduce only the rows currently in use at 2-BM and give the two fields needed to address each one over Channel Access:

• EPICS Ethernet Tag — the controller-side tag that the PLC publishes on the EtherNet/IP-to-EPICS gateway.

• Short Description — the human-readable label the PLC team attached to each row.

Source of truth is the Excel master (BLEPS EPICS Transfer Table Master 2BM.xls), itself part of the wider 2-BM BLEPS document set on Box (see the Box link in the 2-BM implementation section above). The full PV name on the EPICS gateway is the Base Name + PV Name template BL:$(xx)$(yy):<base name in caps>, which is also in the master Excel.

FIFOs (210 entries)

EPICS Ethernet Tag	Short Description
Faults.Number[0]	Fault Number 01
Faults.Number[1]	Fault Number 02
Faults.Number[2]	Fault Number 03
Faults.Number[3]	Fault Number 04
Faults.Number[4]	Fault Number 05
Faults.Number[5]	Fault Number 06
Faults.Number[6]	Fault Number 07
Faults.Number[7]	Fault Number 08
Faults.Number[8]	Fault Number 09
Faults.Number[9]	Fault Number 10
Faults.Year[0]	Fault Year 01
Faults.Year[1]	Fault Year 02
Faults.Year[2]	Fault Year 03
Faults.Year[3]	Fault Year 04
Faults.Year[4]	Fault Year 05
Faults.Year[5]	Fault Year 06
Faults.Year[6]	Fault Year 07
Faults.Year[7]	Fault Year 08
Faults.Year[8]	Fault Year 09
Faults.Year[9]	Fault Year 10
Faults.Month[0]	Fault Month 01
Faults.Month[1]	Fault Month 02
Faults.Month[2]	Fault Month 03
Faults.Month[3]	Fault Month 04
Faults.Month[4]	Fault Month 05
Faults.Month[5]	Fault Month 06
Faults.Month[6]	Fault Month 07
Faults.Month[7]	Fault Month 08
Faults.Month[8]	Fault Month 09
Faults.Month[9]	Fault Month 10
Faults.Day[0]	Fault Day 01
Faults.Day[1]	Fault Day 02
Faults.Day[2]	Fault Day 03
Faults.Day[3]	Fault Day 04
Faults.Day[4]	Fault Day 05
Faults.Day[5]	Fault Day 06
Faults.Day[6]	Fault Day 07
Faults.Day[7]	Fault Day 08
Faults.Day[8]	Fault Day 09
Faults.Day[9]	Fault Day 10
Faults.Hour[0]	Fault Hour 01
Faults.Hour[1]	Fault Hour 02
Faults.Hour[2]	Fault Hour 03
Faults.Hour[3]	Fault Hour 04
Faults.Hour[4]	Fault Hour 05
Faults.Hour[5]	Fault Hour 06
Faults.Hour[6]	Fault Hour 07
Faults.Hour[7]	Fault Hour 08
Faults.Hour[8]	Fault Hour 09
Faults.Hour[9]	Fault Hour 10
Faults.Minute[0]	Fault Minute 01
Faults.Minute[1]	Fault Minute 02
Faults.Minute[2]	Fault Minute 03
Faults.Minute[3]	Fault Minute 04
Faults.Minute[4]	Fault Minute 05
Faults.Minute[5]	Fault Minute 06
Faults.Minute[6]	Fault Minute 07
Faults.Minute[7]	Fault Minute 08
Faults.Minute[8]	Fault Minute 09
Faults.Minute[9]	Fault Minute 10
Faults.Second[0]	Fault Second 01
Faults.Second[1]	Fault Second 02
Faults.Second[2]	Fault Second 03
Faults.Second[3]	Fault Second 04
Faults.Second[4]	Fault Second 05
Faults.Second[5]	Fault Second 06
Faults.Second[6]	Fault Second 07
Faults.Second[7]	Fault Second 08
Faults.Second[8]	Fault Second 09
Faults.Second[9]	Fault Second 10
Trips.Number[0]	Trip Number 01
Trips.Number[1]	Trip Number 02
Trips.Number[2]	Trip Number 03
Trips.Number[3]	Trip Number 04
Trips.Number[4]	Trip Number 05
Trips.Number[5]	Trip Number 06
Trips.Number[6]	Trip Number 07
Trips.Number[7]	Trip Number 08
Trips.Number[8]	Trip Number 09
Trips.Number[9]	Trip Number 10
Trips.Year[0]	Trip Year 01
Trips.Year[1]	Trip Year 02
Trips.Year[2]	Trip Year 03
Trips.Year[3]	Trip Year 04
Trips.Year[4]	Trip Year 05
Trips.Year[5]	Trip Year 06
Trips.Year[6]	Trip Year 07
Trips.Year[7]	Trip Year 08
Trips.Year[8]	Trip Year 09
Trips.Year[9]	Trip Year 10
Trips.Month[0]	Trip Month 01
Trips.Month[1]	Trip Month 02
Trips.Month[2]	Trip Month 03
Trips.Month[3]	Trip Month 04
Trips.Month[4]	Trip Month 05
Trips.Month[5]	Trip Month 06
Trips.Month[6]	Trip Month 07
Trips.Month[7]	Trip Month 08
Trips.Month[8]	Trip Month 09
Trips.Month[9]	Trip Month 10
Trips.Day[0]	Trip Day 01
Trips.Day[1]	Trip Day 02
Trips.Day[2]	Trip Day 03
Trips.Day[3]	Trip Day 04
Trips.Day[4]	Trip Day 05
Trips.Day[5]	Trip Day 06
Trips.Day[6]	Trip Day 07
Trips.Day[7]	Trip Day 08
Trips.Day[8]	Trip Day 09
Trips.Day[9]	Trip Day 10
Trips.Hour[0]	Trip Hour 01
Trips.Hour[1]	Trip Hour 02
Trips.Hour[2]	Trip Hour 03
Trips.Hour[3]	Trip Hour 04
Trips.Hour[4]	Trip Hour 05
Trips.Hour[5]	Trip Hour 06
Trips.Hour[6]	Trip Hour 07
Trips.Hour[7]	Trip Hour 08
Trips.Hour[8]	Trip Hour 09
Trips.Hour[9]	Trip Hour 10
Trips.Minute[0]	Trip Minute 01
Trips.Minute[1]	Trip Minute 02
Trips.Minute[2]	Trip Minute 03
Trips.Minute[3]	Trip Minute 04
Trips.Minute[4]	Trip Minute 05
Trips.Minute[5]	Trip Minute 06
Trips.Minute[6]	Trip Minute 07
Trips.Minute[7]	Trip Minute 08
Trips.Minute[8]	Trip Minute 09
Trips.Minute[9]	Trip Minute 10
Trips.Second[0]	Trip Second 01
Trips.Second[1]	Trip Second 02
Trips.Second[2]	Trip Second 03
Trips.Second[3]	Trip Second 04
Trips.Second[4]	Trip Second 05
Trips.Second[5]	Trip Second 06
Trips.Second[6]	Trip Second 07
Trips.Second[7]	Trip Second 08
Trips.Second[8]	Trip Second 09
Trips.Second[9]	Trip Second 10
Warnings.Number[0]	Warning Number 01
Warnings.Number[1]	Warning Number 02
Warnings.Number[2]	Warning Number 03
Warnings.Number[3]	Warning Number 04
Warnings.Number[4]	Warning Number 05
Warnings.Number[5]	Warning Number 06
Warnings.Number[6]	Warning Number 07
Warnings.Number[7]	Warning Number 08
Warnings.Number[8]	Warning Number 09
Warnings.Number[9]	Warning Number 10
Warnings.Year[0]	Warning Year 01
Warnings.Year[1]	Warning Year 02
Warnings.Year[2]	Warning Year 03
Warnings.Year[3]	Warning Year 04
Warnings.Year[4]	Warning Year 05
Warnings.Year[5]	Warning Year 06
Warnings.Year[6]	Warning Year 07
Warnings.Year[7]	Warning Year 08
Warnings.Year[8]	Warning Year 09
Warnings.Year[9]	Warning Year 10
Warnings.Month[0]	Warning Month 01
Warnings.Month[1]	Warning Month 02
Warnings.Month[2]	Warning Month 03
Warnings.Month[3]	Warning Month 04
Warnings.Month[4]	Warning Month 05
Warnings.Month[5]	Warning Month 06
Warnings.Month[6]	Warning Month 07
Warnings.Month[7]	Warning Month 08
Warnings.Month[8]	Warning Month 09
Warnings.Month[9]	Warning Month 10
Warnings.Day[0]	Warning Day 01
Warnings.Day[1]	Warning Day 02
Warnings.Day[2]	Warning Day 03
Warnings.Day[3]	Warning Day 04
Warnings.Day[4]	Warning Day 05
Warnings.Day[5]	Warning Day 06
Warnings.Day[6]	Warning Day 07
Warnings.Day[7]	Warning Day 08
Warnings.Day[8]	Warning Day 09
Warnings.Day[9]	Warning Day 10
Warnings.Hour[0]	Warning Hour 01
Warnings.Hour[1]	Warning Hour 02
Warnings.Hour[2]	Warning Hour 03
Warnings.Hour[3]	Warning Hour 04
Warnings.Hour[4]	Warning Hour 05
Warnings.Hour[5]	Warning Hour 06
Warnings.Hour[6]	Warning Hour 07
Warnings.Hour[7]	Warning Hour 08
Warnings.Hour[8]	Warning Hour 09
Warnings.Hour[9]	Warning Hour 10
Warnings.Minute[0]	Warning Minute 01
Warnings.Minute[1]	Warning Minute 02
Warnings.Minute[2]	Warning Minute 03
Warnings.Minute[3]	Warning Minute 04
Warnings.Minute[4]	Warning Minute 05
Warnings.Minute[5]	Warning Minute 06
Warnings.Minute[6]	Warning Minute 07
Warnings.Minute[7]	Warning Minute 08
Warnings.Minute[8]	Warning Minute 09
Warnings.Minute[9]	Warning Minute 10
Warnings.Second[0]	Warning Second 01
Warnings.Second[1]	Warning Second 02
Warnings.Second[2]	Warning Second 03
Warnings.Second[3]	Warning Second 04
Warnings.Second[4]	Warning Second 05
Warnings.Second[5]	Warning Second 06
Warnings.Second[6]	Warning Second 07
Warnings.Second[7]	Warning Second 08
Warnings.Second[8]	Warning Second 09
Warnings.Second[9]	Warning Second 10

Faults (46 entries)

EPICS Ethernet Tag	Short Description
A_Fault_Exists	Any A_Fault Exists
Communications_Fault	1 Communications Fault
Flow1.Over_Range_Fault	11 Flow 1 Over Range Fault
Flow2.Over_Range_Fault	12 Flow 2 Over Range Fault
Flow3.Over_Range_Fault	13 Flow 3 Over Range Fault
Flow4.Over_Range_Fault	14 Flow 4 Over Range Fault
Flow5.Over_Range_Fault	15 Flow 5 Over Range Fault
Flow6.Over_Range_Fault	16 Flow 6 Over Range Fault
Flow7.Over_Range_Fault	17 Flow 7 Over Range Fault
Flow8.Over_Range_Fault	18 Flow 8 Over Range Fault
Temp1.Under_Range_Fault	51 Temp 1 Under Range Fault
Temp2.Under_Range_Fault	52 Temp 2 Under Range Fault
Temp3.Under_Range_Fault	53 Temp 3 Under Range Fault
BIV.Fail_to_Close	100 BIV Fail to Close
FES.Fail_to_Close	101 FES Fail to Close
SBS.Fail_to_Close	102 SBS Fail to Close
GV1.Faulted	GV1_Faulted
GV1.Fault.Both_Switch	1011 GV1 Both Switch
GV1.Fault.Opened_Switch	1012 GV1 Opened Switch
GV1.Fault.Fail_to_Open	1013 GV1 Fail to Open
GV1.Fault.Fully_Open	1014 GV1 Fail To Fully Open
GV1.Fault.Closed_Switch	1015 GV1 Closed Switch
GV1.Fault.Fail_to_Close	1016 GV1 Fail to Close
GV1.Fault.Fully_Close	1017 GV1 Fail To Fully Close
GV1.Fault.Beam_Exposure	1018 GV1 Beam Exposure
GV1.Fault.No_Switch	1019 GV1 No Switch
GV2.Faulted	GV2_Faulted
GV2.Fault.Both_Switch	1021 GV2 Both Switch
GV2.Fault.Opened_Switch	1022 GV2 Opened Switch
GV2.Fault.Fail_to_Open	1023 GV2 Fail to Open
GV2.Fault.Fully_Open	1024 GV2 Fail To Fully Open
GV2.Fault.Closed_Switch	1025 GV2 Closed Switch
GV2.Fault.Fail_to_Close	1026 GV2 Fail to Close
GV2.Fault.Fully_Close	1027 GV2 Fail To Fully Close
GV2.Fault.Beam_Exposure	1028 GV2 Beam Exposure
GV2.Fault.No_Switch	1029 GV2 No Switch
GV3.Faulted	GV3_Faulted
GV3.Fault.Both_Switch	1031 GV3 Both Switch
GV3.Fault.Opened_Switch	1032 GV3 Opened Switch
GV3.Fault.Fail_to_Open	1033 GV3 Fail to Open
GV3.Fault.Fully_Open	1034 GV3 Fail To Fully Open
GV3.Fault.Closed_Switch	1035 GV3 Closed Switch
GV3.Fault.Fail_to_Close	1036 GV3 Fail to Close
GV3.Fault.Fully_Close	1037 GV3 Fail To Fully Close
GV3.Fault.Beam_Exposure	1038 GV3 Beam Exposure
GV3.Fault.No_Switch	1039 GV3 No Switch

Trips (19 entries)

EPICS Ethernet Tag	Short Description
A_Trip_Exists	Any A_Trip Exists
Flow1.Below_Set_Point_Trip	11 Flow 1 Below Set Point
Flow2.Below_Set_Point_Trip	12 Flow 2 Below Set Point
Flow3.Below_Set_Point_Trip	13 Flow 3 Below Set Point
Flow4.Below_Set_Point_Trip	14 Flow 4 Below Set Point
Flow5.Below_Set_Point_Trip	15 Flow 5 Below Set Point
Flow6.Below_Set_Point_Trip	16 Flow 6 Below Set Point
Flow7.Below_Set_Point_Trip	17 Flow 7 Below Set Point
Flow8.Below_Set_Point_Trip	18 Flow 8 Below Set Point
Temp1.Above_Set_Point_Trip	51 Temp 1 Above Set Point
Temp2.Above_Set_Point_Trip	52 Temp 2 Above Set Point
Temp3.Above_Set_Point_Trip	53 Temp 3 Above Set Point
VS1.Trip	101 Vacuum Section 1
VS2.Trip	102 Vacuum Section 2
VS3.Trip	103 Vacuum Section 3
VS4.Trip	104 Vacuum Section 4
VS5.Trip	105 Vacuum Section 5
VS6.Trip	106 Vacuum Section 6
VS7.Trip	107 Vacuum Section 7

Warnings (30 entries)

EPICS Ethernet Tag	Short Description
Warning_Exists	Any Warn Exists
Flow1.Under_Range_Warning	11 Flow 1 Under Range Warn
Flow2.Under_Range_Warning	12 Flow 2 Under Range Warn
Flow3.Under_Range_Warning	13 Flow 3 Under Range Warn
Flow4.Under_Range_Warning	14 Flow 4 Under Range Warn
Flow5.Under_Range_Warning	15 Flow 5 Under Range Warn
Flow6.Under_Range_Warning	16 Flow 6 Under Range Warn
Flow7.Under_Range_Warning	17 Flow 7 Under Range Warn
Flow8.Under_Range_Warning	18 Flow 8 Under Range Warn
Temp1.Over_Range_Warning	51 Temp 1 Over Range Warn
Temp2.Over_Range_Warning	52 Temp 2 Over Range Warn
Temp3.Over_Range_Warning	53 Temp 3 Over Range Warn
IP1.Warning	101 Ion Pump 1 Warning
IP2.Warning	102 Ion Pump 2 Warning
IP3.Warning	103 Ion Pump 3 Warning
IP4.Warning	104 Ion Pump 4 Warning
IP5.Warning	105 Ion Pump 5 Warning
IP6.Warning	106 Ion Pump 6 Warning
IP7.Warning	107 Ion Pump 7 Warning
IG1.Warning	201 Ion Gauge 1 Warning
IG2.Warning	202 Ion Gauge 2 Warning
IG3.Warning	203 Ion Gauge 3 Warning
IG4.Warning	204 Ion Gauge 4 Warning
IG5.Warning	205 Ion Gauge 5 Warning
IG6.Warning	206 Ion Gauge 6 Warning
IG7.Warning	207 Ion Gauge 7 Warning
IG8.Warning	208 Ion Gauge 8 Warning
Power Supply 1.Warning	3 Power Supply 1 Warning
Power Supply 2.Warning	4 Power Supply 2 Warning
OR'ing Module.Warning	5 OR’ing Module Warning

Info (29 entries)

EPICS Ethernet Tag	Short Description
Info.Beamline_Number	Sector Number
Info.Beamline_Type	BM/ID, 0=BM, 1=ID
Info.Software_Version
Info.CPU_Product_Code	Processor Version
Info.CPU_Product_Revision	Processor revision
Info.CPU_Serial_Number	Processor Serial Number
Info.Year	Current Year
Info.Month	Current Month
Info.Day	Current Day
Info.Hour	Current Hour
Info.Minute	Current Minute
Info.Second	Current Second
Info.Last_Scan_Time	Time for Last scan
Info.Max_Scan_Time	Time for Longest scan
Info.Major_Events	Processor Major Events
Info.Major_Fault_Bits	Processor Major Event Bits
Info.Major_Fault.Time_Low	Major Fault Time Low
Info.Major_Fault.Time_High	Major Fault Time High
Info.Major_Fault.Type	Major Fault Type
Info.Major_Fault.Code	Major Fault Code
Info.Major_Fault.Info	Major Fault info
Info.Minor_Events	Processor Minor Fault
Info.Minor_Fault_Bits	Processor Minor Event Bits
Info.Minor_Fault.Time_Low	Minor Fault Time Low
Info.Minor_Fault.Time_High	Minor Fault Time High
Info.Minor_Fault.Type	Minor Fault Type
Info.Minor_Fault.Code	Minor Fault Code
Info.Minor_Fault.Info	Minor Fault info
Info.Communication_Faults	Control Net Faults

Flows (24 entries)

EPICS Ethernet Tag	Short Description
Flow1.Scaling_Factor	Scaling factor for 1st Flow
Flow1.Set_Point	Low Setpoint for 1st Flow
Flow1.Current_Value	Current value for 1st Flow
Flow2.Scaling_Factor	Scaling factor for 2nd Flow
Flow2.Set_Point	Low Setpoint for 2nd Flow
Flow2.Current_Value	Current value for 2nd Flow
Flow3.Scaling_Factor	Scaling factor for 3rd Flow
Flow3.Set_Point	Low Setpoint for 3rd Flow
Flow3.Current_Value	Current value for 3rd Flow
Flow4.Scaling_Factor	Scaling factor for 4th Flow
Flow4.Set_Point	Low Setpoint for 4th Flow
Flow4.Current_Value	Current value for 4th Flow
Flow5.Scaling_Factor	Scaling factor for 5th Flow
Flow5.Set_Point	Low Setpoint for 5th Flow
Flow5.Current_Value	Current value for 5th Flow
Flow6.Scaling_Factor	Scaling factor for 6th Flow
Flow6.Set_Point	Low Setpoint for 6th Flow
Flow6.Current_Value	Current value for 6th Flow
Flow7.Scaling_Factor	Scaling factor for 7th Flow
Flow7.Set_Point	Low Setpoint for 7th Flow
Flow7.Current_Value	Current value for 7th Flow
Flow8.Scaling_Factor	Scaling factor for 8th Flow
Flow8.Set_Point	Low Setpoint for 8th Flow
Flow8.Current_Value	Current value for 8th Flow

Temps (6 entries)

EPICS Ethernet Tag	Short Description
Temp1.Set_Point	High Setpoint for 1st Temp
Temp1.Current_Value	Current value for 1st Temp
Temp2.Set_Point	High Setpoint for 2nd Temp
Temp2.Current_Value	Current value for 2nd Temp
Temp3.Set_Point	High Setpoint for 3rd Temp
Temp3.Current_Value	Current value for 3rd Temp

Inputs (24 entries)

EPICS Ethernet Tag	Short Description
BIV.Closed	Beamline Iso Valve Closed
FES.Closed	Front End Shutter Closed
SBS.Closed	Station B Shutter Closed
IP1.Status	Ion Pump 1 Vacuum Status
IP2.Status	Ion Pump 2 Vacuum Status
IP3.Status	Ion Pump 3 Vacuum Status
IP4.Status	Ion Pump 4 Vacuum Status
IP5.Status	Ion Pump 5 Vacuum Status
IP6.Status	Ion Pump 6 Vacuum Status
IP7.Status	Ion Pump 7 Vacuum Status
IG1.Status	Ion Gauge 1 Vacuum Status
IG2.Status	Ion Gauge 2 Vacuum Status
IG3.Status	Ion Gauge 3 Vacuum Status
IG4.Status	Ion Gauge 4 Vacuum Status
IG5.Status	Ion Gauge 5 Vacuum Status
IG6.Status	Ion Gauge 6 Vacuum Status
IG7.Status	Ion Gauge 7 Vacuum Status
IG8.Status	Ion Gauge 8 Vacuum Status
GV1.Closed_LS	Vacuum Gate Valve 1 Closed
GV1.Opened_LS	Vacuum Gate Valve 1 Opened
GV2.Closed_LS	Vacuum Gate Valve 2 Closed
GV2.Opened_LS	Vacuum Gate Valve 2 Opened
GV3.Closed_LS	Vacuum Gate Valve 3 Closed
GV3.Opened_LS	Vacuum Gate Valve 3 Opened

Outputs (10 entries)

EPICS Ethernet Tag	Short Description
BIV.Permit	Beamline Iso Valve Permit
FES.Permit	Front End Shutter Permit
SBS.Permit	Station B Shutter Permit
GV1.Open_Command	Gate Valve 1 Open Command
GV2.Open_Command	Gate Valve 2 Open Command
GV3.Open_Command	Gate Valve 3 Open Command
Red_Light	Red Beacon Light
Yellow_Light	Yellow Beacon Light
Green_Light	Green Beacon Light
Buzzer	Audio Buzzer

Display (9 entries)

EPICS Ethernet Tag	Short Description
GV1.Type	GV1 Type
GV1.Open_Permit	GV1 Open Permit
GV1.Close_Permit	GV1 Close Permit
GV2.Type	GV2 Type
GV2.Open_Permit	GV2 Open Permit
GV2.Close_Permit	GV2 Close Permit
GV3.Type	GV3 Type
GV3.Open_Permit	GV3 Open Permit
GV3.Close_Permit	GV3 Close Permit

EPICS_Inputs (8 entries)

EPICS Ethernet Tag	Short Description
A_Fault_Reset_EPICS	EPICS A_Fault Reset
Trip_Reset_EPICS	EPICS Trip Reset
GV1.EPICS_Open	EPICS GV1 Open Request
GV1.EPICS_Close	EPICS GV1 Close Request
GV2.EPICS_Open	EPICS GV2 Open Request
GV2.EPICS_Close	EPICS GV2 Close Request
GV3.EPICS_Open	EPICS GV3 Open Request
GV3.EPICS_Close	EPICS GV3 Close Request

See also

• Beamline components — beamline components reference (per-component PV names; the shutter blocks document the BLEPS-closable shutters).

• BLEPS at the APS is a facility-wide standard; equivalent systems exist on every beamline, with the interlock matrix tailored to that beamline’s hardware.