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- Siemens
- 6AG2241-1CH30-1XB0
- Communication Board
- Germany
- 38 × 62 × 21 mm
- 0.034 kg
- Xiamen, China
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Product Overview
The Siemens 6AG2241-1CH30-1XB0 is a SIPLUS S7-1200 CB 1241 RS485 RAIL communication board. It adds an RS-485 serial interface to a compatible SIMATIC S7-1200 CPU, allowing the controller to exchange data with field devices that use supported serial protocols. The board is based on the standard 6ES7241-1CH30-1XB0 CB 1241 RS485 and incorporates conformal coating for specified demanding environmental conditions.
This communication board is useful when a PLC needs to communicate with serial instruments, compatible variable-speed drives or other equipment using RS-485. Supported communication options include Freeport, ASCII, Modbus RTU master/slave and USS drive communication. The appropriate protocol and message handling depend on the connected equipment and the PLC application.
The CB 1241 installs directly on a compatible S7-1200 CPU as a communication board, rather than occupying a conventional signal-module position. Its terminal-block connection supports the RS-485 field wiring, making it suitable for serial communication tasks in compact control systems and specified railway-related installations.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Siemens |
| Order Number | 6AG2241-1CH30-1XB0 |
| Product Family | SIPLUS S7-1200 CB 1241 RS485 RAIL |
| Product Type | Communication Board |
| Product Designation | CB 1241 RS485 |
| Base Model | 6ES7241-1CH30-1XB0 |
| Automation Platform | SIMATIC S7-1200 |
| Communication Interface | RS-485 |
| Connection Type | Terminal block |
| Communication Mode | Serial, point-to-point or supported RS-485 network arrangement |
| Supported Protocols | Freeport, ASCII, Modbus RTU master, Modbus RTU device, USS |
| Maximum Cable Length | 1,000 m |
| Maximum Freeport Telegram Length | 1 kbyte |
| Freeport Bits per Character | 7 or 8 |
| Freeport Stop Bits | 1 or 2 |
| Typical Current Consumption from 5 V DC Backplane Bus | 50 mA |
| Typical Power Loss | 1.5 W |
| Diagnostic Function | Yes |
| Conformal Coating | Yes |
| Operating Temperature Range | -25 to +55 °C |
| Short-Term Temperature Capability | Up to +70 °C for 10 minutes under specified conditions |
| Railway Environmental Standards | EN 50155, EN 15121, EN 50124, EN 50125 and EN 45545 |
| Protection Class | IP20 |
| Dimensions | 38 × 62 × 21 mm |
| Weight | 0.034 kg |
Product Features
- RS-485 serial interface: Adds serial communication capability to a compatible S7-1200 CPU.
- Terminal-block connection: Provides a wired interface for RS-485 communication signals.
- Multiple protocol options: Supports Freeport, ASCII, Modbus RTU and USS for compatible applications.
- Modbus RTU master and device operation: Supports data exchange with compatible Modbus equipment according to the configured role.
- Freeport communication: Allows the PLC application to handle user-defined serial telegrams.
- USS drive communication: Supports communication with compatible drives using the USS protocol.
- SIPLUS conformal coating: Protects the electronic assembly under the specified environmental conditions.
- RAIL environmental capability: Supports the stated temperature range and railway-related environmental qualifications.
- Integrated diagnostics: Provides diagnostic functionality to assist with troubleshooting.
- CPU-mounted expansion: Adds serial communication without using a conventional S7-1200 signal-module slot.
Working Principle
The CB 1241 RS485 acts as the serial communication interface between the S7-1200 CPU and external equipment. The PLC program prepares data for transmission and processes incoming messages, while the board handles the configured serial interface and supported communication functions.
In Modbus RTU master operation, the PLC initiates requests to compatible devices and processes their responses. In Modbus RTU device operation, it responds to requests addressed to the configured device. Freeport allows the application to work with custom telegram formats, while USS supports communication with compatible drives for exchanging operating data and drive parameters.
The RS-485 interface supports long-distance serial wiring within its specified limits. Network topology, termination, signal reference, baud rate and device addressing must be configured appropriately for the installation. A protocol mismatch or incorrect wiring can prevent communication even when the board is correctly installed.
Role in a SIMATIC S7-1200 Communication Architecture
The 6AG2241-1CH30-1XB0 extends the S7-1200 CPU with RS-485 communication. It connects the controller’s application logic to compatible serial equipment, allowing process data, device status and control commands to be exchanged through the configured protocol.
| System Component | Function | Relationship to the Communication Board |
|---|---|---|
| SIMATIC S7-1200 CPU | Executes the PLC program | Processes received data and generates communication requests |
| 6AG2241-1CH30-1XB0 | Provides RS-485 serial communication | Exchanges data between the CPU and connected devices |
| RS-485 Network Wiring | Carries differential serial signals | Connects the board to compatible equipment |
| Modbus RTU Device | Exchanges registers and status information | Communicates through the configured Modbus role |
| Compatible Variable-Speed Drive | Controls motor operation | Can exchange drive commands and status through a supported protocol |
| Serial Instrument | Reports measurements or operating status | Sends data to the PLC application |
| TIA Portal | Configures hardware and develops PLC logic | Supports communication setup and application programming |
| 24 V DC Control-System Supply | Powers the S7-1200 system | Supplies the CPU and associated hardware according to system requirements |
| HMI Panel | Displays operating data and alarms | Presents information processed by the PLC |
| Diagnostic Logic | Evaluates communication and device status | Helps identify missing responses or abnormal operating conditions |
Industrial Applications
| Application | Communication Requirement | Role of the Board |
|---|---|---|
| Modbus RTU Networks | Exchange process values and device registers | Supports master or device communication with compatible equipment |
| Variable-Speed Drive Integration | Exchange commands, parameters and status | Supports USS or other applicable serial communication methods |
| Industrial Instrumentation | Collect measurements from serial instruments | Transfers data to the S7-1200 application |
| Water and Wastewater Systems | Communicate with distributed instruments and control devices | Provides RS-485 connectivity for supported serial protocols |
| Packaging Machinery | Exchange status and configuration data with peripheral devices | Connects serial equipment to the PLC |
| Machine Retrofits | Integrate compatible legacy serial equipment | Adds RS-485 connectivity to an S7-1200 CPU |
| Railway-Related Automation | Communicate with compatible serial equipment under specified environmental conditions | Provides the SIPLUS RAIL version’s environmental characteristics |
| Industrial Process Skids | Link a PLC to serial instruments or drives | Supports centralized data exchange through RS-485 |
Installation and Maintenance
- Verify the order number: Confirm that 6AG2241-1CH30-1XB0 matches the required SIPLUS S7-1200 CB 1241 RS485 RAIL communication board.
- Check CPU compatibility: Confirm that the intended SIMATIC S7-1200 CPU supports the communication board and its required configuration.
- Isolate the equipment: Follow the site’s electrical safety procedures before installing or removing the board or changing field wiring.
- Inspect the mounting interface: Check the CPU mounting position and connector interface for damage or contamination before installation.
- Identify the communication protocol: Determine whether the application requires Modbus RTU, Freeport, ASCII or USS before configuring the PLC program.
- Check RS-485 wiring: Verify signal polarity, terminal assignments and the wiring arrangement against the applicable connection diagram.
- Plan the network topology: Use an appropriate RS-485 bus arrangement and account for termination and signal-reference requirements.
- Observe the cable-length limit: Keep the communication cable within the specified maximum length and consider baud rate and installation conditions.
- Configure serial parameters: Match communication speed, character format, parity and other applicable settings across the connected devices.
- Set device addressing: For Modbus RTU applications, confirm the master/slave or master/device roles and ensure that addresses are configured correctly.
- Test communication: Verify message exchange, response timing and diagnostic indications before placing the system into normal operation.
- Document the configuration: Record the protocol, network layout, device addresses, serial settings and any changes made during maintenance.
Related Components
| Component | Function | Relationship to the Communication Board |
|---|---|---|
| Siemens 6ES7241-1CH30-1XB0 | Standard SIMATIC S7-1200 CB 1241 RS485 communication board | Base model for the SIPLUS RAIL version |
| SIMATIC S7-1200 CPU | Executes the automation program | Hosts the communication board |
| RS-485 Terminal Wiring | Carries serial communication signals | Connects the board to field devices |
| Modbus RTU Instrument | Exchanges measurements and status registers | Communicates through a configured Modbus application |
| Compatible Siemens Drive | Controls motor speed and torque | Can exchange data using a supported drive communication protocol |
| RS-485 Termination Components | Reduce signal reflections on suitable bus installations | Used when required by the network design |
| TIA Portal | Configures and programs the S7-1200 system | Supports hardware configuration and communication logic |
| SIMATIC HMI Panel | Displays operating values and alarms | Presents PLC data to operators |
| Siemens 6AG2241-1AH32-1XB0 | SIPLUS S7-1200 CM 1241 RS232 RAIL communication module | Related serial product for RS-232 devices, not a direct RS-485 replacement |
Recommended Related Models
| Model | Product Type | Relationship | Selection Consideration |
|---|---|---|---|
| Siemens 6AG2241-1CH30-1XB0 | SIPLUS S7-1200 CB 1241 RS485 RAIL Communication Board | Main product | RS-485 connectivity with SIPLUS RAIL environmental characteristics |
| Siemens 6ES7241-1CH30-1XB0 | SIMATIC S7-1200 CB 1241 RS485 Communication Board | Standard base model | Consider the environmental and installation requirements |
| Siemens 6AG1241-1CH30-5XB1 | SIPLUS S7-1200 CB 1241 RS485 Communication Board | Related SIPLUS variant | Compare the specified environmental range and mounting requirements |
| Siemens 6AG2241-1AH32-1XB0 | SIPLUS S7-1200 CM 1241 RS232 RAIL Communication Module | Related serial communication product | Choose when the connected equipment requires RS-232 rather than RS-485 |
| Siemens 6AG2241-1CH32-1XB0 | SIPLUS S7-1200 CM 1241 RS422/485 RAIL Communication Module | Related serial communication module | Consider when a communication-module format or RS-422 support is required |
| Siemens 6ES7241-1CH32-0XB0 | SIMATIC S7-1200 CM 1241 RS422/485 Communication Module | Standard serial communication module | Check interface type, mounting format and environmental requirements |
Key Advantages
- Adds RS-485 communication directly to a compatible S7-1200 CPU.
- Supports Modbus RTU, Freeport, ASCII and USS communication functions.
- Uses a terminal-block connection for serial field wiring.
- Incorporates conformal coating and specified railway-related environmental qualifications.
- Provides diagnostic functionality for communication troubleshooting.
Technical FAQs
Can the 6AG2241-1CH30-1XB0 communicate with multiple Modbus RTU devices?
Yes. It supports Modbus RTU master operation for compatible devices on an appropriately configured RS-485 network. The number of devices and network arrangement must follow the applicable protocol and electrical requirements.
Is this communication board suitable for USS drive communication?
Yes. USS is supported through the communication board’s available protocol functions. The PLC program, drive parameters and serial settings must be configured for the connected drive and intended communication tasks.
What should be checked when the S7-1200 cannot read data from an RS-485 device?
Check the A/B signal wiring and terminal assignments, baud rate, parity, stop bits, device address and protocol configuration. Also inspect network termination and grounding where applicable, and review diagnostic information and device response behavior.
Can this board replace the CM 1241 RS232 module?
No, not as a direct interface replacement. The 6AG2241-1CH30-1XB0 uses RS-485, while the CM 1241 RS232 uses RS-232. The interface, wiring and electrical characteristics must match the connected equipment.