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Chapter 4
Configure the Base 857 Relay
22
External I/O configuration for 857-RAD
Follow these steps to select the external I/O device type and protocol.
1. Under Protocol Configuration, select External I/O Configuration.
2. Click the External I/O Device Type.
3. Select 857-RAD.
4. Click External I/O Protocol.
5. Select ModBus.
The External I/O Bit Rate should be set to 9600 bits per second (bps) and the
Data Parity is always Even.
IMPORTANT If a parameter is changed, it will be highlighted in red. This indicates that a
change has been made and this data must be uploaded into the base relay.
Once saved to the relay, the relay may request a reboot (restart) depending
on the setting changed.
The External I/O Bit Rate should be set to 9600 bits per second (bps) and the
Data Parity is always Even.
The 857-RAA input settings are shown in
Table 6 - External I/O Configuration Settings
External I/O Device Type
(1)
External I/O Protocol
(1)
External I/O bit rate
(1)
Parity
(1) After changing this parameter, you must restart the relay using SetPointPS or by cycling power the 857 base relay.
Rockwell Automation Publication 857-UM002C-EN-P - February 2018
Table
6.
857-RAD
ModBus
9600
Even
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