How Ethernet I/O Simplifies Communication Between One PLC and Multiple Remote Locations Application Note
This document illustrates using Acromag’s BusWorks® XT Ethernet I/O modules to split one signal from a central control room PLC and control multiple remote locations using Ethernet protocol.
Defining the Problem:
A customer has multiple remote locations linked over an Ethernet network, each requiring discrete outputs. They all need to be sent the same communication signal at the same time.
All remote sites need to be controlled simultaneously from one central control room via Ethernet protocol
Implementing the Solution:
- Set up the Ethernet comunication between master PLC device and the BusWorks XT discrete I/O modules (XT1111)
- Connect the field instruments and verify input status using the software test & polling feature
- Program the BAS with the remote I/O network parameters and Modbus registers.
- 16-Channel Discrete I/O, Modbus/TCP XT1111-000
- 16-Channel Discrete I/O, with Counter/Timers 989EN-4016
- Software Interface Package XT-SIP
Our BusWorks XT Modbus/TCP remote I/O modules include a peer-to-peer feature known as i2o, where two or more slaves can talk to each other without requiring a master. With i2o communication, one signal from the PLC is split by the XT1111 modules and sent to multiple locations. The XT1111 automatically re-transmits the discrete level to each 989EN module’s IP address, thus reproducing the status of the original PLC input.