Rockwell Automation T8451 Trusted TMR 24V dc Digital Output Module - 40 Channel - Manual (Page 20)

Trusted
TM
Module T8451
Issue 12 Apr 10 PD-T8451 20
Value Description
7 Channel fault
6 Field fault (e.g. field leakage to 0V or 24V)
5 Short circuit in field wiring or load
4 Output energised (ON)
3 Open circuit in field wiring or load
2 Output de-energised (OFF)
1 No field supply voltage
0 Unused
Table 7 Rack 2: STATE Output description
3.2.3. Rack 3: AI
The AI board returns the field loop voltage at the output.
Channel Description
1 Field output channel 1 voltage
2 Field output channel 2 voltage
40 Field output channel 40 voltage
Table 8 Rack 3: AI 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 /
500
V. 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 500 to return the voltage 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 voltage. The full-scale range for this number format is decimal ±64, corresponding to
physical range –32000 to +32000.