Siemens SIMATIC S7-1200 CM 1242-5 PROFIBUS DP slave communicatiemodule 6ES72784BD320XB0

The Siemens 6ES7278-4BD32-0XB0 is a communication module for the SIMATIC S7-1200 series that adds PROFIBUS DP slave functionality to the controller. Unlike basic expansion modules that only add I/O, this module integrates the S7-1200 into existing PROFIBUS networks as a slave device, enabling data exchange with a PROFIBUS master. It supports data rates up to 12 Mbit/s and provides a 9-pin D-sub connector for the PROFIBUS network.

Highlights

• PROFIBUS DP slave interface for SIMATIC S7-1200 CPUs
• Supports up to 244 bytes of input and 244 bytes of output data
• Data rates up to 12 Mbit/s
• Powered via the S7-1200 backplane bus
• Configuration via Siemens TIA Portal

In daily use

The CM 1242-5 module mounts on a DIN rail alongside the S7-1200 CPU and connects to the PROFIBUS network via a standard 9-pin D-sub connector. It draws power directly from the backplane bus, so no separate power supply is needed. The module is configured using Siemens TIA Portal software, which handles the PROFIBUS slave settings and data mapping. It operates in temperatures from 0 to 60 °C when mounted horizontally and up to 50 °C vertically.

Full specifications

• Product type: Communication module
• Series: SIMATIC S7-1200
• Interface: PROFIBUS DP
• PROFIBUS data rate: up to 12 Mbit/s
• PROFIBUS connector: 1x 9-pin D-sub
• Max. input data: 244 bytes
• Max. output data: 244 bytes
• Power supply: via S7-1200 backplane bus
• Current consumption from backplane: 100 mA at 5 V DC
• Operating temperature (horizontal): 0 to 60 °C
• Operating temperature (vertical): 0 to 50 °C
• Storage temperature: -40 to 70 °C
• Relative humidity: 10-95% non-condensing
• Protection class: IP20
• Mounting type: DIN rail
• Configuration software: Siemens TIA Portal
• Compatibility: SIMATIC S7-1200 CPUs
• Firmware update: supported

Final note

The CM 1242-5 is the direct way to connect a SIMATIC S7-1200 controller to a PROFIBUS DP network as a slave, with simple configuration through TIA Portal.