Monitoring the TRT Hardware Interlock System

Version 0.0: 2 April, 2007

Index

  1. LEDs on the Logic Board
  2. DCS Monitoring Signals
  3. How to tell what's disabled

LEDs on Logic Board

State No. LEDs conditions
Comparator Boards 256 • green
• yellow
• yellow
• red
 • Board OK
• barrel ntc count over threshold
• endcap ntc count over threshold
• board disabled
Sums/Trip 4 • yellow
• yellow
• yellow
• red
 • barrel sum over threshold
• endcap sum over threshold
• trip condition met (no delay)
• trip signal sent (trip cond + delay)
System Disable 1 • red • Logic Board disabled
   (perhaps add a big flashing light on top of rack)

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Full List of Possible DCS Monitoring Signals

Name No. of
Terms 		Signal Description
Trip Signal Monitoring
barrel_ntc_cnt[i] 64 analog level (0-8) Count of barrel NTCs over threshold for Comparator Board i
• 8 barrel NTCs per Comparator Board
• ~250 mV / NTC
endcap_ntc_cnt[i] 64 analog level (0-20) Count of endcap NTCs over threshold for Comparator Board i
• 20 endcap NTCs per Comparator Board
• ~250 mV / NTC
spare_cnt[i] 8 analog level (0-??) Readout of spare Logic Board input i
• DCS watchdog state + ???
barrel_sum 1 analog level (0-64) Count of Comparator Boards (barrel section) over threshold
• ??? mV / board
endcap_sum 1 analog level (0-64) Count of Comparator Boards (endcap section) over threshold
• ??? mV / board
spare_sum 1 analog level (0-??) Count of Spare Inputs over threshold
• ??? mV / input
barrel_over 1 binary Barrel Sum is over the trip threshold
endcap_over 1 binary Endcap Sum is over the trip threshold
spare_over 1 binary Spare Sum is over the trip threshold
trip_inst 1 binary Trip condition has been met
• no delay-time requirement
trip_delay 1 binary Trip signal has been sent to HV/LV rack
• trip condition & delay-time requirement
Enable/Disable Monitoring
cmpbrd_disable[i] 64 binary Comparator Board i is disabled
spare_disable[i] 8 binary Spare Input i is disabled
logic_disable 1 binary Logic Board is disabled
Not Necessary ?
cmpbrd_bar_over[i] 64 binary Comparator Board i Count (barrel section) is over the trip threshold
• corresponds to Logic Board Conparator LEDs
cmpbrd_end_over[i] 64 binary Comparator Board i Count (endcap section) is over the trip threshold
• corresponds to Logic Board Conparator LEDs

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Monitoring Disabled Components

DCS Status
  • TRT DCS watchdog is a Trip Condition input ?
Logic Board Output
  • Prominent DCS Alarm in Control Room
  • Flashing Light on rack in USA15
  • LED on Logic Board front panel
Comparator Boards
(inputs to Logic)
  • DCS Variable: state display at Interlock GUI
  • LEDs on Logic Board front panel
Comp Board Power
  • Trip Condition if Comp Board enabled

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