The Allen-Bradley 1747-L541 SLC 500 Modular Processor includes a built-in DH+ channel that supports extended messaging capabilities and high-speed communication, and an RS-232 channel that supports Modbus RTU, ASCII, DH-48t, and DF1 radio modem communication. Advanced math instructions and various additional instructions are included for programming. The module supports indirect addressing, remote I/O, and DeviceNet pass-through.
The module is ideal for medium applications, and can implement distributed I/O with the a communication adapter on the CPU rack and communication scanner on the I/O racks. The RS232 communication port is configurable for DF1 and DH485 peer-to-peer topology, and DH+ supports multi-drop and extended distance topology.
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