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Chapter 4
Application
Rockwell Automation Publication ICSTT-RM451D-EN-P - March 2021
25
Table 7 Rack 2: State Output Descriptions
Channel
Description
6
Field fault (for example, field leakage to 0V or
24V)
5
Short circuit in field wiring or load
4
Output energized (ON)
3
Open circuit in field wiring or load
2
Output de-energized (OFF)
1
No field supply voltage
0
Unused
Rack 3: AI
The AI board returns the field loop voltage at the output.
Table 8 Rack 3: AI Descriptions
Channel
Description
1
Field output channel 1 voltage
2
Field output channel 2 voltage
40
Field output channel 40 voltage
The voltage is the median value that is taken from the triplicated Module. The
voltage level is reported as an integer, with the units being 1/500V. This may
be used directly, scaled arithmetically, or scaled using the IEC 61131 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 IEC 61131 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.
Rack 4: CI
The CI board returns the field loop current at the output.
Table 9 Rack 4: CI Descriptions
Channel
Description
1
Field output channel 1 current
2
Field output channel 2 current
40
Field output channel 40 current