The MVI94 Modbus Client/Server Communication Module allows Rockwell Automation FLEX processors to interface easily with other Modbus protocol compatible devices. Compatible devices include not only Modicon PLCs (which all support the Modbus protocol) but also a wide assortment of end devices. A 5000-word register space in the module exchanges data between the processor and the Modbus network.
The MVI94-MCM module has two serial ports: PRT1 - Debug/Configuration port RS-232 and PRT2 - Modbus port RS-232/422/485; MVI94 unit can sit in any FLEX rack I/O slot and works with all currently available FLEX communication adapters.
Modbus Master port PRT2 functionality: RTU mode (binary) with CRC-16 and ASCII mode with LRC error checking; Memory usage is user configurable; Full radio, modem and multi-drop support; Stores and transfers up to 3996 registers to/from the control processor; 125 word read and write command lengths; Floating point data movement supported; Software configurable communication parameters: Parity: none, odd or even, Stop bits: 1 or 2, Baud rate: 110 to 115,200 baud, RTS on delay: 0 to 65535 ms, RTS Off Delay: 0 to 65535 ms. See spec. sheet for additional information.