Allen-Bradley 1756-M3 Modbus Communications Module

The Allen-Bradley 1756-M3 is a dual-port Modbus communications module designed for use with the ControlLogix 5580 Programmable Automation Controller (PAC) by Rockwell Automation. It enables the ControlLogix 5580 to simultaneously communicate with devices on two independent Modbus networks, expanding its data exchange and control capabilities.

Overview:
Function: Dual-Port Modbus Communications Module
Series: ControlLogix 5580
Part Number: 1756-M3
Supported Modbus Protocols: Modbus RTU, Modbus ASCII (each port)
Baud Rate: Up to 115.2 kbps (each port)
Data Size: 8 bits
Parity: None, Even, Odd (each port)
Stop Bits: 1 or 2 (each port)
Number of Modbus Nodes: Up to 31 per port
Number of Modbus Registers: Up to 4096 per port

Features:
Dual Modbus ports: Enables communication with two separate Modbus networks simultaneously.
Support for both Modbus RTU and Modbus ASCII protocols: Provides flexibility for connecting to various devices.
High Baud rate: Enables fast data communication on both ports.
Wide range of data types supported: Including integers, floating-point numbers, and strings.
Individual diagnostic LEDs: Indicate the status and potential errors for each port.
Removable terminal block (RTB): Simplifies wiring and maintenance.
CE, C-UL, and UL listed: Meets safety and regulatory standards.

Applications:
Integrating ControlLogix PACs with multiple Modbus-enabled devices across different networks.
Exchanging data and control signals between two independent Modbus systems.
Implementing complex industrial automation systems with diverse communication requirements.
Data acquisition and monitoring from various Modbus devices across networks.

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