Siemens 6ES7241-1CH30-1XB0 SIMATIC S7-1200 CB 1241 RS485 Communication Board

The Siemens 6ES7241-1CH30-1XB0 is a SIMATIC S7-1200 CB 1241 communication board that adds an RS485 port with terminal-block wiring for point-to-point serial links up to 1000m. It supports the Freeport, Modbus RTU master/slave, USS, and 3964(R) protocol drivers, drawing 50mA from the backplane bus at 1.5W power loss, and mounts onto the CPU's signal-board slot without using a side-rack position.

Technical Specifications

Certifications & Standards

• CE
• CSA
• UL
• cULus
• FM
• RCM
• KC
• Marine

Selection Notes

Built-in Modbus RTU master and device drivers let this board poll third-party serial devices or answer as a Modbus slave without an external gateway or a separate CM 1241 module on the rack side. It mounts on the CPU's signal-board slot, so it's the right choice when the application needs exactly one extra serial port and the side rack slots are needed for I/O instead — for a second independent RS485/RS232 port, add a CM 1241 communication module rather than stacking signal boards. The 1000m point-to-point run at RS485 levels covers longer field runs than the RS232 boards in the same family support.

Applications

Adds a Modbus RTU or Freeport serial link to a compact S7-1200 CPU for connecting VFDs, meters, or third-party instruments over RS485 without a rack-mounted communication module.