Siemens RS485 Communication Module SIMATIC S7-1200 CB 1241 6ES72411CH301XB0
SIE 6ES72411CH301XB0
6940408100930
Siemens RS485 SIMATIC S7-1200 CB 1241 communication card: reliable and versatile connectivity for your automation system, with the following features:
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Compatible with: SIMATIC S7-1200, direct installation on CPU
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RS485 interface: With support for Modbus RTU, USS, Freeport and 3964(R) protocols
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Point-to-point communication: With cable up to 1000 meters
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Support: Freeport and ASCII with dedicated libraries
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Degree of protection: IP20 and wide operating temperature range
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Certified: CE, UL, CSA, RCM, Marine and other industrial approvals
€116.09
Items Available: 23
: 4
Siemens Communication Board maximum flexibility for serial communication
The CB 1241 RS485 is a Communication Board for SIMATIC S7-1200 PLCs designed to extend the communication capabilities of the CPU. With support for major industrial protocols such as Modbus RTU (master and slave), USS, Freeport, and 3964(R), it offers broad versatility in managing serial devices and integrating heterogeneous systems.
Robust, long-range connectivity
Point-to-point communication over RS485 interface enables stable connection up to 1000 meters cable length, with support for up to 32 devices per network segment, expandable via repeaters. A perfect solution for distributed automation in industrial or plant engineering.
High performance and integrated diagnostics
The board offers comprehensive diagnostics, reporting any anomalies or malfunctions. With telegram length up to 1 kB and wide configurability of communication parameters (bits per character, stop bits, parity), it ensures reliable performance even in complex environments.
Suitable for harsh environmental conditions
Designed to withstand demanding environmental conditions, the CB 1241 operates properly in a temperature range of -20 °C to +60 °C (up to +50 °C vertically) and tolerates humidity up to 95 percent without condensation. All this in a compact and robust format with IP20 protection.
Certifications and compliance
The product complies with major international standards and has the following certifications: CE, UL, CSA, cULus, FM, KC, RCM and Marine Approval, making it suitable for use even in naval applications or regulated environments.
Technical Specifications Siemens Communication Module
| Type | CB 1241 RS485 for S7-1200 |
| Interface | RS485 |
| Supported protocols | Freeport, ASCII (with library), Modbus RTU (master/slave), USS (with library), 3964(R) |
| Maximum cable length | 1000 m |
| Maximum telegram | 1 kB |
| Communication configuration | Bit/char: 7 or 8 Stop bit: 1 or 2 Parity: none, even, odd, mark, space |
| Built-in diagnostics | Yes |
| Power supply | From back bus: 5 V DC, typ. 50 mA |
| Power loss | 1,5 W |
| Degree of protection | IP20 |
| Dimensions (W x H x D) | 38 x 62 x 21 mm |
| Operating temperature | -20 °C TO +60 °C |
| Storage temperature | -40 °C TO +70 °C |
| Maximum relative humidity | 95% (non-condensing) |
| Certifications | CE, UL, CSA, RCM, KC, Marine, FM |
| Mounting | On SIMATIC S7-1200 CPU |
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Data sheet
- Type: Interface Modules
