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Siemens 6ES7241-1CH30-0XB0 — PLC Communication Modules

Siemens 6ES7241-1CH30-0XB0 CM 1241 RS485 Module, RS422/485,

MPN6ES7241-1CH30-0XB0

Siemens SIMATIC S7-1200 CM 1241 RS485 communication module, order code 6ES7241-1CH30-0XB0, RS422/485 interface, 9-pin D-sub, supports USS and ASCII protocols via library function, IP20, 30 x 100 x 75 mm.

$180.02Ref. price · indicative, final on quote
Siemens 6ES7241-1CH30-0XB0 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

6ES7241-1CH30-0XB0 — Electrical
ParameterValue
Current consumption, max.220 mA; From L5+; logic
Power loss (typ.)1.1 W
6ES7241-1CH30-0XB0 — Environmental
ParameterValue
Operating temperature, max.70 °C
Operating temperature, min.-40 °C
IP protection degreeIP20
Operating temperature, horizontal install, min.0 °C
Operating temperature, horizontal install, max.55 °C
Operating temperature, vertical install, max.45 °C
Operating temperature, vertical install, min.0 °C
6ES7241-1CH30-0XB0 — Mechanical
ParameterValue
Width30 mm
Height100 mm
Depth75 mm

Product details

What the CM 1241 RS485 does

The Siemens 6ES7241-1CH30-0XB0 is a Communication Module CM 1241 for the SIMATIC S7-1200 controller family. It provides a single RS422/485 interface on a 9-pin D-sub socket, supporting Freeport protocol in addition to USS and ASCII available as library functions. That means protocol handling is done in the CPU software using library blocks, not in the module hardware — factor the programming effort into your spares or line-based planning. The module draws 220 mA from the L5+ backplane logic supply and dissipates 1.1 W typ. At 30 mm wide, it fits tightly in the rack with room alongside CPU and other modules. IP20 rated, clean environment only.

Sourcing and compatibility note

This module snaps into any S7-1200 CPU rack and communicates over the backplane bus, supporting USS and ASCII via library functions. The RS485 interface uses a 9-pin D-sub socket and supports cable lengths up to 1 000 m.

Frequently asked questions

Does 6ES7241-1CH30-0XB0 support USS protocol?

Yes, USS is available as a library function for the CPU. It is not hardware-implemented on the module itself.

What is the maximum operating temperature for the CM 1241 RS485?

The module is rated for -40 to 70 °C ambient, covering both cold unheated cabinets and warm enclosures.

Will 6ES7241-1CH30-0XB0 drop into a panel originally specified with 6AG1278-4BD32-4XB0?

No, due to the width difference: 30 mm vs 45 mm. The SIPLUS variant is wider and may not fit the same rail or leave room for adjacent modules. Rewiring or panel modification is required.

MPN
6ES7241-1CH30-0XB0