The Saia-Burgess BUS M120 is an S-Bus master module designed for use with Saia PCD1 and PCD2 programmable logic controllers (PLCs). It enables robust and efficient master/slave communication over an RS485 network, supporting up to 32 stations per segment and up to 255 stations in total, with a maximum segment length of 1200 meters. The BUS M120 is ideal for industrial automation networks requiring reliable data exchange between multiple PLCs and distributed I/O modules.

This module supports twisted, shielded two-wire bus lines and integrates seamlessly with Saia S-Bus protocol, offering baud rates from 110 to 38,400 bit/s and fast register transmission rates. It is suitable for point-to-point and multi-segment installations, with repeaters available for network extension. The BUS M120 is engineered for demanding industrial environments, providing stable communication and easy integration with Saia PLC hardware.

Key Features:

• S-Bus master module for Saia PCD1/PCD2 PLCs

• RS485 physical interface for robust industrial networking

• Supports up to 32 stations per segment, 255 total

• Max. segment length: 1200 m (twisted, shielded cable)

• Baud rates: 110 to 38,400 bit/s

• Fast data transfer: Up to 265 registers/s (at 19,200 bps)

• Error detection: CRC-16

• Supports point-to-point and multi-segment topologies

• Compatible with Saia S-Bus protocol

• Industrial-grade design for reliable operation

Saia-Burgess – BUS M120 – S-Bus Master Module, RS485, for PCD1/PCD2 PLC Systems