6GK7243-5DX30-0XE0 SIMATIC S7-1200 CM 1243-5 Communication Module.

The 6GK7243-5DX30-0XE0 is the Siemens article number for the SIMATIC S7-1200 CM 1243-5 Communication Module.

Unlike the CPU units, this is an expansion card used specifically to turn an S7-1200 PLC into a PROFIBUS DP Master module. This allows the PLC to control older or specialized legacy field devices like drives, remote I/O blocks, and instruments running on PROFIBUS.

The complete technical profile for this module includes:

General Configuration

• Module Type: CM 1243-5 Communications Module

• Primary Function: Connects a SIMATIC S7-1200 CPU to a PROFIBUS network as a DP Master.

• Firmware Compatibility: Integrates seamlessly into the V4.x hardware matrix via TIA Portal.

Power Supply & Electrical

• Supply Voltage: 24 V DC (takes external supply via a 3-pole terminal block).

• Permissible Range: 20.4 V to 28.8 V DC.

• Current Consumption: Typ. 0.1 A at 24 V DC.

• Power Loss: ~2.4 W.

PROFIBUS Interface Specifications

• Physical Interface: 1 x 9-pin Sub-D socket (RS485).

• Transfer Rates: Automatically detects and supports data rates from 9.6 kbit/s up to 12 Mbit/s.

• Services Supported:

  • PROFIBUS DP Master (DP-V1 functionality).

  • PG/OP Communication (for HMI panel mapping or programming access).

  • S7 Communication.

• Capacity Limit: Supports a maximum connection of up to 32 PROFIBUS DP Slaves.

Expansion Placement

• Mounting Position: Must be fitted to the left side of the S7-1200 CPU.

• Maximum per CPU: A maximum of 1 CM 1243-5 master module can be configured per CPU station (though you can run it alongside other left-side Ethernet/Serial modules).

Physical & Environmental

• Dimensions (W x H x D): 30 mm x 100 mm x 75 mm (Standard single-width module).

• Net Weight: ~0.134 Kg.

• Enclosure Rating: IP20.