Siemens 6ES7137-6AA01-0BA0 SIMATIC ET 200SP CM PtP RS422/485/232 Serial Communication Module

The Siemens 6ES7137-6AA01-0BA0 is a SIMATIC ET 200SP CM PtP point-to-point communication module with RS-422, RS-485, and RS-232 interfaces on push-in terminals, supporting Freeport, 3964(R), USS, and Modbus RTU master/slave protocols at up to 250 kbit/s. It mounts on BaseUnit type A0 and draws 31 mA typical from the ET 200SP backplane.

Technical Specifications

Selection Notes

This module's value is protocol flexibility on one RS-422/485/232 port set - Freeport for custom ASCII devices, 3964(R) for legacy Siemens point-to-point links, and Modbus RTU master or slave for third-party instrumentation, all selectable in configuration rather than requiring separate hardware per protocol. RS-485's 1200 m cable range at reduced baud rate suits long-distance sensor or metering links across a plant floor; RS-232's 15 m limit restricts it to local device connections such as a barcode scanner at the panel. As a Modbus RTU master it addresses up to 32 slave devices, covering most single-segment instrumentation networks without a gateway.

Applications

Connecting ET 200SP stations to legacy serial devices, third-party instrumentation, or barcode and RFID readers over RS-232/422/485 where the plant network doesn't run PROFINET or PROFIBUS end-to-end.