Rockwell Automation T8423 Trusted TMR 35 - 120 Vdc Digital Input Module - Manual (Page 22)

Trusted
TM
Module T8423
Issue 15 Apr 10 PD-T8423 22
The IEC1131 TOOLSET conversion tables may be used to convert the input value to engineering
units, in this case voltage. The full-scale range for this number format is decimal ±256, corresponding
to physical range –32768 to +32767. Other units may be chosen depending on the numeric resolution
and span of the desired result.
When the TMR Processor detects a 2oo3 channel fault or discrepancy, or if the input module is
simulated, the input voltage numeric value is reported as –2048.
3.2.4. Rack 4: SPARE
This rack is reserved for future used and is included to promote consistency with other High Integrity
I/O modules.
3.2.5. Rack 5: LINE_FLT
Channel Description
1 Field input channel 1 line fault
2 Field input channel 2 line fault
40 Field input channel 40 line fault
Table 11 Rack 5: LINE_FLT
The line fault input is reported as true (logic ‘1’) for a line fault condition (open circuit, indeterminate, or
short circuit condition). The logic state is the majority voted value.
When the TMR Processor detects a 2oo3 channel fault or discrepancy, or if the input module is
simulated, the line fault input is set to True.
3.2.6. Rack 6: DISCREP
Channel Description
1 Discrepancy status inputs 1 to 16 (input 1 is
LSB, bit 0)
2 Discrepancy status inputs 17 to 32 (input 17
is LSB, bit 0)
3 Discrepancy status inputs 33 to 40 (input 33
is LSB, bit 0)
Table 12 Rack 6: DISCREP bit descriptions
Each of the integers reports the discrepancy status of 16 input channels. The corresponding bit within
the integer is set to ‘1’ when a discrepancy condition is detected on that input channel’s input state
(rack 2). For example, if slice B of the input module reports the state of channel 4 as state 5, while
slices A and C report channel 4 as state 2, then Slice B has a channel discrepancy for channel 4. In
this case, bit 3 of channel 1 on the Discrepancy board would be set to ‘1’.