Rockwell Automation T8424 Trusted TMR 120Vac Digital Input Module - Manual (Page 16)

Trusted TM Module T8424
Issue 8 Sep 11 PD-T8424 16
Value Description
7 Faulted
6 N/A
5 N/A
4 Closed contact (ON)
3 N/A
2 Open contact (OFF)
1 N/A
0 FTA to module Open circuit.
Table 6 Rack 2: STATE Input Bit descriptions
The input channel has a value 7 (Unknown) when:
1. The input channel cannot be correctly measured by two or more slices of the TMR input
module.
2. The TMR Processor detects a 2-oo-3 channel discrepancy between the three slices of the
TMR input module.
3. The module is simulated (not installed or the TMR Processor cannot communicate with 2-oo-
3 slices of the module).
3.2.3. Rack 3: AI - Channel Field Voltage
The AI board returns the field loop voltage at the input.
Channel Description
1 Field input channel 1 voltage
2 Field input channel 2 voltage
40 Field input channel 40 voltage
Table 7 Rack 3: AI -Channel Field Voltage descriptions
The voltage is the median value taken from the triplicated module. The voltage level is reported as an
integer, with the units being
1 /
100
V, i.e. a reported value of 10000 corresponds to a 100VAC RMS input
signal amplitude. This may be used directly, scaled arithmetically or scaled using the IEC1131
TOOLSET conversion tables.
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 ±327.67,
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 use and is included for consistency with other High Integrity I/O
modules.