Product Overview
Technical Summary
| Parameter | Value |
|---|---|
| Communication interface | RS485 |
| Connection | Terminal block |
| Supported protocols | Freeport; ASCII; Modbus RTU master; Modbus RTU device; USS |
| Modbus RTU master address area | 1 through 49 999 (Standard Modbus addressing) |
| Modbus RTU device address area | 1 through 49 999 (Standard Modbus addressing) |
| Maximum Modbus RTU devices | 247; maximum 32 devices per MODBUS network segment; additional repeaters needed to expand the network to maximum configuration |
| Backplane bus input current | 5 V DC, typ. 50 mA |
| Typical power loss | 1.5 W |
| Diagnostics function | Yes |
| IP degree of protection | IP20 |
Applications
- Serial communication: Supports Freeport, ASCII, Modbus RTU master, Modbus RTU device and USS communication through RS485.
Key Features
- RS485 communication board: CB 1241 RS 485 Communication Board for SIMATIC S7-1200 with a terminal block.
- Supported protocol drivers: Supports Freeport, ASCII, Modbus RTU master, Modbus RTU device and USS; ASCII and USS are available as library functions.
- Point-to-point cable length: Maximum cable length: 1 000 m.
- Freeport telegram length: Maximum Freeport telegram length: 1 kbyte.
- Modbus RTU device capacity: Up to 247 devices; slave numbers 1 through 247, with a maximum of 32 devices per MODBUS network segment and additional repeaters needed for the maximum configuration.
- Electrical and protection data: Input current from the backplane bus 5 V DC, typ.: 50 mA. Power loss, typ.: 1.5 W. IP degree of protection: IP20.
Frequently Asked Questions
1. What communication protocols does the Siemens 6ES7241-1CH30-1XB0 support?
It supports Freeport, ASCII, Modbus RTU master, Modbus RTU device and USS. ASCII and USS are available as library functions.
2. What cable length is supported for the CB 1241 RS485 board?
The maximum point-to-point cable length is 1 000 m.
3. How many Modbus RTU devices are supported?
The maximum is 247 devices, with slave numbers 1 through 247. Each MODBUS network segment supports a maximum of 32 devices; additional repeaters are needed for the maximum configuration.
4. What connection does this Communication Board use?
It uses a terminal block.
