Recommended Use of ETHERNET ConnectionsΒΆ
The following types of ETHERNET communication is required:
- UDP: Communication between the two CPUs for HA synchronization.
- AB: Communication between CPUs and Engineering PC for program download.
- OPC: Communication between CPUs and HMI (optionally).
- WEB: Web server communication between CPUs and HMI (optionally).
ETHERNET ports are available on the CPU (onboard) and on the CM577-ETH communication module. For an optimal load balance the following connections are recommended:
| CPU Type | Web server required | Onboard ETH1 | Onboard ETH2 | CM577-ETH |
|---|---|---|---|---|
| PM57x, PM58x, PM591, PM592 | No | UDP | n/a | AB, OPC |
| PM57x, PM58x, PM591, PM592 | Yes | AB, OPC, WEB | n/a | UPD |
| PM592-2ETH, PM595 | No | UDP | AB, OPC | - |
| PM592-2ETH, PM595 | Yes | UDP | AB, OPC, WEB | - |
Note
PM591-2 ETH and PM595 PLCs must use onboard ETH1 for UDP data communication.