• Product type: Communication module
• Manufacturer: Siemens
• Product family: SIMATIC S7-1200
• Model designation: CM 1243-5
• Primary function:

PROFIBUS DP Master communication module

Connects SIMATIC S7-1200 PLC to PROFIBUS networks

Supports PG/OP and S7 communication

• Communication protocol: PROFIBUS DPV1
• Transmission rate: 9.6 kbit/s to 12 Mbit/s
• Number of supported slaves: Up to 16 PROFIBUS DP slaves
• Interface type:

1 × PROFIBUS interface (RS-485, 9-pin Sub-D)

• Supply voltage: 24 V DC
• Mounting type: DIN rail mounting
• Housing design: Compact S7-1200 module format
• Protection class: IP20
• Operating temperature: −20 °C to +60 °C
• Dimensions (W × H × D): 30 × 100 × 75 mm
• Weight: Approx. 0.13–0.19 kg
• Key features:

Easy configuration using STEP 7

Supports module replacement without PG

Enables connection of operator panels and programming devices

Industrial-grade communication reliability

• Typical applications:

Industrial automation systems

PROFIBUS field device integration

Factory automation networks

PLC-to-fieldbus communication

1. Datasheet