ProSoft MVI94-MCM-MHI Modbus Master

Product Description

MVI94-MCM-MHI is a dedicated single-slot protocol communication module developed by ProSoft Technology for Rockwell Allen‑Bradley SLC 500 series PLC backplane.

It acts as both Modbus RTU Master and Slave simultaneously, realizing bidirectional data exchange between SLC500 CPU and third-party Modbus devices including inverters, 

instruments, flow meters, RTUs and touch screens. Equipped with two isolated RS485 Modbus ports, internal high-speed data buffer, configurable fault action logic and front diagnostic LEDs. 

Conformal coated PCB, directly plug into SLC 500 chassis slot, widely used as replacement spare for old-generation water treatment, packaging machinery, HVAC and factory retrofit automation projects.

Technical Specifications

Model: MVI94-MCM-MHI, Brand: ProSoft Technology, Origin: USA

Compatible Host: Allen‑Bradley SLC 500 rack (5/03, 5/04, 5/05 CPU)

Protocol Mode: Modbus RTU Master + Slave dual mode

Communication Ports: 2 × isolated RS485 DB9 serial ports

Supported Baud Rates: 1200 / 2400 / 4800 / 9600 / 19200 / 38400 bps

Max Master Poll Points: Up to 100 Modbus slave nodes on the bus

Data Buffer Capacity: Large block input/output register mapping between Modbus and SLC data file

Electrical Isolation: 1500V isolation between backplane and field RS485 bus

Backplane Power Consumption: 550mA @ 5VDC from SLC rack power supply

Configuration Tool: ProSoft Configuration Builder (PCB) software

Operating Temperature: 0℃ ~ +60℃ full load

Storage Temperature: -40℃ ~ +85℃

Humidity: 5%–95% non-condensing, conformal coated PCB

Protection Class: IP20 cabinet internal installation only

Mounting: Standard single slot plug-in for SLC 500 chassis

Net Weight: Approx. 0.32kg

Certifications: CE, UL industrial EMC compliance

Key Features

Dual RS485 isolated channels support independent Modbus bus networks, expanding communication capacity without occupying PLC programming port.

Master/Slave integrated function: polls field Modbus devices as master, accepts host query as slave, flexible for multi-device networking.

Flexible data mapping, supports register offset adjustment and byte swapping to adapt different manufacturer Modbus address definitions.

Configurable fault mode: hold last value or reset output to zero when bus communication fails, ensures safe interlock logic.

Front panel LED indicators for module run status, backplane link, port TX/RX and fault alarm for quick on-site troubleshooting.

Electrical isolation design effectively eliminates ground loop interference and protects SLC backplane from field surge voltage damage.

Plug-and-play rack installation, power-off direct one-to-one replacement, simple commissioning for old equipment maintenance.

Perfect compatibility with legacy SLC 500 control systems, ideal spare for aging production line PLC communication retrofit.