140CRA31908 适配器模块 是S908总线的I/O主机

140CRA31908C

This guide describes the 140CRA31908 adapter module. Use this module to modernize S908 architectures to M580 systems.
Quantum or 984 CPUs drive S908 non-Ethernet RIO architectures. When you mount and install the 140CRA31908 module in am X80 drop in an M580 system, you can attach S908 architectures to that X80 drop and allow your S908 network to communicate with the M580 network.
NOTE: The 140CRA31908 module is not compatible with Quantum Ethernet I/O architectures; the module cannot be scanned by a Quantum 140CRP31200 communication module.
NOTE: The specific configuration settings contained in this guide are intended to be used for instructional purposes only. The settings required for your specific configuration may differ from the examples presented in this guide.

Two of the Ethernet ports allow implicit I/O exchanges with an M580 ePAC through the EIO network. (An implicit I/O exchange has a maximum frame size of 1,400 bytes.) You can use both Ethernet ports when you connect the 140CRA31908 module to an Ethernet main ring.
There is a maximum of 31 adapters in a single EIO network. For network topologies, refer to the Modicon M580 Hot Standby, System Planning Guide for Frequently Used Architectures (see Modicon M580 Hot Standby, System Planning Guide for, Frequently Used Architectures)

Identification of the I/O master of the S908 bus:
 In a configuration with a single 140CRA31908 module, the 140CRA31908 is the I/O master of the S908 bus.
 In configurations that have redundant 140CRA31908 modules the Com Act LED on the 140CRP93•00 module identifies the I/O master.