Rockwell Automation T8461 Trusted TMR 24 48Vdc Digital Output Module - Manual (Page 21)

Trusted
TM
Module T8461
Issue 13 Apr 10 PD-T8461 21
3.2.4. Rack 4: CI
The CI board returns the field loop current at the output.
Channel Description
1 Field output channel 1 current
2 Field output channel 2 current
40 Field output channel 40 current
Table 9 Rack 4: CI descriptions
The current is the sum value taken from the triplicated module. The current level is reported as an
integer, with the units being
1 /
1000
A. This may be used directly, scaled arithmetically or scaled using the
IEC1131 TOOLSET conversion tables.
To scale the value arithmetically simply divide the returned ‘integer’ by 1000 to return the current as
either a REAL or INTEGER as required.
The IEC1131 TOOLSET conversion tables may be used to convert the value to engineering units, in
this case current. The full-scale range for this number format is decimal ±32, corresponding to
physical range –32000 to +32000.
3.2.5. Rack 5: LINE_FLT
Channel Description
1 Field output channel 1 line fault
2 Field output channel 2 line fault
40 Field output channel 40 line fault
Table 10 Rack 5: LINE_FLT descriptions
The line fault input state is reported as true (logic ‘1’) for a line fault condition (open circuit, short circuit,
and no field supply voltage). The logic state is the majority voted value.
3.2.6. Rack 6: DISCREP
Channel Description
1 Discrepancy status outputs 1 to 16 (output
1 is LSB)
2 Discrepancy status outputs 17 to 32
(output 17 is LSB)
3 Discrepancy status outputs 33 to 40
(output 33 is LSB)
Table 11 Rack 6: DISCREP bit descriptions
Each of the words reports the discrepancy status of 16 output channels. The corresponding bit within
the word is set to ‘1’ when a discrepancy condition is detected on that output channel’s output state
(rack 2).