GE IC670ALG620 Datasheet page 10

Analog Input Module
RTD Input Module
Diagnostics
The RTD module performs diagnostics and provides the diagnostic data to the BIU using its
configured discrete input (I) references, starting at the configured reference offset.
The RTD sets the appropriate bit when a diagnostic condition is detected. The bit remains set
until cleared.
Circuit Diagnostics Bits (byte 0)
7 6 5 4 3 2 1 0
Circuit Diagnostics Bits (byte 1)
7 6 5 4 3 2 1 0
Clearing Faults and Alarms
Four optional discrete output bits in the BIU's discrete output (Q) table can be used to clear
module faults and alarms.
Setting the discrete output bit for an RTD clears all diagnostic bits for that RTD that may be
set.
Output Command Bits to Clear Diagnostics
Low alarm for RTD 1
High alarm for RTD 1
Low alarm for RTD 2
High alarm for RTD 2
Low alarm for RTD 3
High alarm for RTD 3
Low alarm for RTD 4
High alarm for RTD 4
Input underrange, RTD 1
Input overrange, RTD 1
Input underrange, RTD 2
Input overrange, RTD 2
Input underrange, RTD 3
Input overrange, RTD 3
Input underrange, RTD 4
Input overrange, RTD 4
7 6 5 4 3 2 1 0
Circuit Diagnostics Bits (byte 2)
7 6 5 4 3 2 1 0
Circuit Diagnostics Bits (byte 3)
7 6 5 4 3 2 1 0
Clear All Faults on RTD 1
Clear All Faults on RTD 2
Clear All Faults on RTD 3
Clear All Faults on RTD 4
not used
not used
not used
not used
9
GFK-1206D
June 1997
Open Wire, RTD 1
Open Wire, RTD 2
Open Wire, RTD 3
Open Wire, RTD 4
Shorted input, RTD 1
Shorted input, RTD 2
Shorted input, RTD 3
Shorted input, RTD 4
Wiring error, RTD 1
Wiring error, RTD 2
Wiring error, RTD 3
Wiring error, RTD 4
spare
spare
spare
spare