1. Product Overview

• Model: MVI56E-MCMR (often written MV156E-MCMR)

• Manufacturer: ProSoft Technology

• Platform: Allen‑Bradley ControlLogix 1756 chassis

• Function: Modbus RTU/ASCII serial gateway for ControlLogix; dual serial ports, master/slave per portProSoft Technology Inc

• Data Size: Reduced 40‑word I/O block (vs. 200‑word standard MVI56E‑MCM)

• Typical Use: Low‑bandwidth ControlNet/remote chassis, small Modbus point counts

2. Key Features

• Dual serial ports: Independent RS‑232/RS‑422/RS‑485 (switchable)ProSoft Technology Inc

• Modbus modes: RTU (CRC16) / ASCII (LRC); each port master or slaveProSoft Technology Inc

• Function codes: 01/02/03/04/05/06/15/16 (all common Modbus)

• Database: 10,000‑word internal register map; float supportProSoft Technology Inc

• Configuration: ProSoft Configuration Builder (PCB), web diagnostics, CIP pass‑thru

• LEDs: 4‑character scrolling plain‑text status display

• Backward compatible: Replaces older MVI56 modules without logic changesProSoft Technology Inc

3. Communications Specifications

• Baud rate: 110–115,200 bpsProSoft Technology Inc

• Data/parity/stop: 7/8 data bits; none/odd/even parity; 1/2 stop bitsProSoft Technology Inc

• Connector: DB9 (EIA‑232/EIA‑485)ProSoft Technology Inc

4. Electrical & Environmental

• Backplane power: 800 mA @ 5 VDC; 3 mA @ 24 VDC

• Power consumption: 1.5 W typical

• Operating temp: 0 °C to +60 °C (32 °F to 140 °F)

• Storage temp: −40 °C to +85 °C (−40 °F to 185 °F)

• Humidity: 5%–95% non‑condensing

• Vibration: 5 g (10–150 Hz); Shock: 30 g operational / 50 g non‑operational

5. LED Indicators

• MOD: Module status

• BP: Backplane communication

• APP: Application run status

• TX/RX: Serial transmit/receive activity

6. MVI56E‑MCMR vs MVI56E‑MCM

• MVI56E‑MCM: Standard 200‑word I/O block; large data exchangeProSoft Technology Inc

• MVI56E‑MCMR: 40‑word reduced I/O block; saves bandwidth for remote/ControlNet

7. Applications

• Connect Modbus RTU/ASCII drives, meters, flowmeters, instruments to ControlLogixProSoft Technology Inc

• Remote chassis / ControlNet low‑bandwidth links

• Legacy Modbus device integration in Rockwell systemsProSoft Technology Inc