Rack 3: Ai; Rack 4: Ci - Rockwell Automation ICSTT-RM280N-EN-P Manual

3. Application

3.2.3. Rack 3: AI

The AI board returns the field loop voltage at the output.
The voltage is the median value taken from the triplicated Module. The voltage level is
reported as an integer, with the units being
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.
3.2.4.

Rack 4: CI

The CI board returns the field loop current at the output.
The current is the sum value taken from the triplicated Module. The current level is
reported as an integer, with the units being
arithmetically or scaled using the IEC 61131 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.
18
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
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
Issue 14
Trusted TMR 24Vdc Digital Output Module – 40 Channel
1/
V. This may be used directly, scaled
500
1 / A. This may be used directly, scaled
1000
Rockwell Automation Publication ICSTT-RM280N-EN-P