Controller - Institute of Transportation Engineers

5.4.2.10
A 22-line minimum HAR 2 Harness shall be provided between EX2 Connector and Type
2070-6 Serial COMM Module in the 2070 UNIT. This provides two Modems or EIA-232
Interfaces with the 2070 UNIT and the outside world.
5.4.2.11 Fault and Voltage Monitor Circuitry
NEMA TS1 and TS2 Controller FAULT and VOLTAGE MONITOR functions (outputs
to cabinet monitor) shall be provided.
5.4.2.11.1
Two 3-input OR gates shall be provided. The gate 1 output shall be connected to
Connector A, Pin A (FAULT MONITOR) and gate 2 output shall be connected to
Connector A, Pin C. Any FALSE state input shall cause a gate output FALSE (+24VDC)
state.
5.4.2.11.2
The FCU Port 10, Bit 7 output shall normally change its state every 100 ms. A MODULE
Watchdog (WDT) circuit shall monitor the output. No state change for 2 ±0.1 seconds
shall cause the circuit output to generate a FALSE (+24 VDC) output (input to gates 1
and 2). Should the FCU begin changing state, the WDT output shall return to TRUE (0
VDC) state.
5.4.2.11.3
The module shall have a +5 VDC monitoring circuit which monitors the module’s +5
VDC (±0.25). If the voltage exceeds the limits, the circuit output shall generate a FALSE
output (input to gates 1 and 2). Normal operation shall return the output state to TRUE
state.
5.4.2.11.4
The FCU microprocessor output shall be assigned to FAULT Monitor (input to gate 1)
and another output shall be assigned to VOLTAGE Monitor (input to gate 2).
5.4.2.11.5
CPU Port 5 SET OUTPUT COMMAND Message OUTPUTs O78 and O79 shall be
assigned to FAULT (O78) and VOLTAGE (O79). The bit logic state “1” shall be FCU
output FALSE.
5.4.2.11.6
Standard for the ATC – Type 2070 March 29, 2001
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