Product Details

The ProSoft MVI71-MNET is a legacy single-slot Modbus TCP communication module designed for Rockwell 1771 PLC-5 chassis platform, which realizes stable Modbus TCP network communication between PLC-5 processors and Modbus TCP compatible field instruments, remote controllers and SCADA host systems. It is equipped with one 10/100Mbps auto-negotiating RJ45 Ethernet port for Modbus TCP data transmission, and a separate RS232 configuration port for configuration download, online communication monitoring and fault diagnosis. The module can run as Modbus TCP client and server at the same time, supporting multiple client commands and server connections, and it supports standard Modbus function codes for reading coils, discrete inputs, holding registers and input registers. It has a built-in local database with 5000 words register space for data caching and mapping, and supports configurable floating-point parsing compatible with Enron and Daniel floating-point formats to solve byte order conversion problems of different Modbus devices. The module exchanges data with the PLC-5 processor through BTR and BTW instructions over the 1771 backplane, and Modbus network polling and message response run asynchronously, so it will not occupy the PLC scan cycle and affect the real-time control logic. Sample ladder logic files are provided for RSLogix 5, and ProSoft Configuration Builder software is used to set client command list, connection parameters and data mapping rules. This module is discontinued and only supplied as spare parts for legacy PLC-5 automation systems.

This module fits standard 1771 single-slot rack and consumes 800mA at 5VDC from the backplane. It supports hot-swappable operation for on-site replacement without shutting down the whole automation rack. Multiple LED indicators display module power status, backplane communication health, Ethernet link status and application running state for fast on-site inspection and troubleshooting. The operating temperature range is 0°C to 60°C, storage temperature ranges from -40°C to 85°C, with 5% to 95% non-condensing humidity tolerance. It meets industrial shock and vibration standards and adopts reliable EMC protection against surge and electrostatic interference. It supports configuration file backup and firmware upgrade for routine maintenance.

This Modbus TCP Ethernet module is widely used in water treatment, oil and gas, petrochemical, power distribution and factory automation renovation projects. It brings native Modbus TCP connectivity inside the PLC-5 rack without external protocol converters, realizing stable data interaction with power meters, pressure transmitters, flow meters, remote RTU and Modicon PAC. As a discontinued legacy communication module, the MVI71-MNET is mainly supplied as spare replacement parts for running automation systems. It maintains stable Modbus TCP data transmission, preserves the original field instruments and Ethernet wiring, and reduces the renovation cost of Modbus TCP network integration.