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Chapter 4
Configure the Base 857 Relay
Parameter
Value
AI Enabled
On, Off
AI Slave Address
1...247
AI Modbus Address 1...9999
AI Register Type
HoldingR, InputR Modbus RTU register type. Relay sets these according to the selected device type.
AI Signed
On, Off
AI Offset
-32000...32000 AI Offset is subtracted from Modbus value, before running X/Y scaling. This is normally left at 0.
x1, y1, x2, y2
-32768...32768 X1 and X2 are the minimum and maximum Modbus values. Y1 and Y2 are the minimum and maximum scaled values (see
24
External Analog Inputs for 857-RAD
The 857-RAD is equipped with four individual isolated analog inputs. If used,
these inputs must be configured within the base relay for proper operations.
IMPORTANT Some of the parameters are preset by the hardware configuration. Not all
Analog Input Settings
Select External Analog Inputs.
In the External Analog Inputs tab, you do not need to adjust the first 12
channels that are associated with the RTD Inputs- if you followed the
Inputs Quick Setup for 857-RAD on page
Notes
Enable the analog input channel by clicking on the appropriate location under the AI Enabled area. Turn ON or OFF each individual
channel. These will be the last four lines of the table.
The AI Slave Address must match the hardware selection made on the dip switch on the side of the 857-RAD module.
Select the units of measure for each channel by clicking on the appropriate location under the AI Unit area. Select mA.
The other units listed in the drop list are not presently available.
AI Signed should be left as OFF. For other uses please contact Rockwell Automation.
Rockwell Automation Publication 857-UM002C-EN-P - February 2018
fields need to be changed.
23.
Figure
RTD
11).
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