GE IC670ALG620, Datasheet, Page: 10 / 11

9
RTD Input Module GFK-1206D
Analog Input Module
June 1997
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.
7 6 5 4 3 2 1 0
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
Circuit Diagnostics Bits (byte 0)
7 6 5 4 3 2 1 0
Input underrange, RTD 1
Input overrange, RTD 1
Circuit Diagnostics Bits (byte 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
Open Wire, RTD 1
Circuit Diagnostics Bits (byte 2)
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
7 6 5 4 3 2 1 0
Wiring error, RTD 1
Circuit Diagnostics Bits (byte 3)
Wiring error, RTD 2
Wiring error, RTD 3
Wiring error, RTD 4
spare
spare
spare
spare
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.
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
Output Command Bits to Clear Diagnostics