Product Description
Product Overview
| Parameter | Details |
|---|---|
| Part Number | 6ES7241-1CH30-1XB0 |
| Product Name | SIMATIC S7-1200 Communication Board CB 1241 RS485 |
| Application | Serial communication interface for industrial automation, SCADA, and legacy device integration (e.g., Modbus RTU, USS, Freeport) |
| Compatibility | SIMATIC S7-1200 PLC (CPU 1211C_1217C); mounts directly on left side of CPU |
| Function | Provides 1_ RS485 serial port with galvanic isolation, baud rate up to 187.5 kbps, and support for point-to-point or multi-point networks |
Functional Specifications
| Parameter | Details |
|---|---|
| Interface Type | RS485 (2-wire, half-duplex) |
| Connector | 9-pin D-sub female (standard PROFIBUS-style) |
| Baud Rates | 300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200, 187500 bps |
| Protocols Supported | Modbus RTU (Master/Slave), USS, Freeport (ASCII), 3964(R) |
| Max Stations | 32 (with repeaters: up to 256) |
| Cable Length | Up to 1000 m at 9600 bps (shielded twisted pair) |
| Isolation | 500 V AC (interface to CPU logic) |
| Termination & Biasing | Built-in switchable 390 Ω termination resistors + biasing network |
| Power Consumption | 1.5 W (from CPU backplane) |
| Operating Temperature | _20°C to +60°C (horizontal); 0°C to +60°C (vertical) |
| Storage Temperature | _40°C to +70°C |
| Dimensions (W_H_D) | 30 mm _ 100 mm _ 75 mm |
| Weight | 0.09 kg (0.20 lbs) |
| Mounting | Direct plug-on left side of S7-1200 CPU (no additional rack space) |
| LED Indicators | 1_ DIAG (red/green) _ status and fault |
| Diagnostics | Link status, transmission error, configuration error (via CPU status bits) |
| Certifications | CE, UL, cULus, CSA, RCM, KC, ATEX, IECEx |
| Standards Compliance | IEC 61131-2, EN 61000-6-2/4 (EMC), UL 508, CSA C22.2 |
Ordering Information
| Parameter | Details |
|---|---|
| Part Number Configuration | 6ES7241-1CH30-1XB0 (CB 1241, RS485, plug-on communication board) |
| Replaces / Supersedes | 6ES7241-1CH30-0XB0 (adds higher baud rate, improved diagnostics) |
| Available Options | _ 6ES7241-1CH32-0XB0: RS232 version _ 6ES7241-1AH32-0XB0: RS232/RS485 combo |
| Accessories | _ 6ES7901-3DB30-0XA0: 9-pin D-sub connector (spare) _ 6ES7972-0BB12-0XA0: PROFIBUS connector with termination |
| Firmware | Configured via TIA Portal (V13 SP1 or higher) _ no field update needed |