modbus communications interface module

mvi94-mcm-std

the mvi94-mcm flex i/o module allows the user to easily add a modbus port to a flex based i/o system.
the mvi94-mcm modbus master solution consumes a single flex i/o slot, and via flex backplane communications can be interfaced to the currently available flex communication adapters. the mvi94-mcm solution enables the many field instruments and other modbus slave compatible devices to be integrated into the rockwell automation flex environment.

features

• the mvi94-mcm module has two serial ports

  prt1 -- debug/configuration port rs-232

  prt2 -- modbus port rs-232/422/485

applications

the mvi94-mcm module is the ideal solution for many applications where modbus master/slave connectivity needs to be added to a flex system. the mvi94-mcm module can be found in many industrial sectors and in following applications -

• foreign device data concentrator
• pipelines & offshore platforms
• food processing
• mining
• pulp & paper

functional specifications

the mvi94 unit can sit in any flex rack i/o slot position and works with all currently available flex communication adapters.

debug/configuration port (prt1)

• communication parameters

  - baud: 57,600 (fixed)

  - parity: none (fixed)

  - stop: 1 (fixed)

• port functionality

  - configuration of module

  - comm and backplane transfer stats

  - protocol data monitor

  - internal database viewer

modbus master port (prt2)

• rtu mode (binary) with crc-16 and ascii mode with lrc error checking
• memory usage is user configurable
• full radio, modem and multi-dr-op support
• support for the storage and transfer of up to 3996 registers to/from the control processor
• 125 word read and write command lengths supported
• 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

protocol specifications - modbus master port

• binary and register data read and write function codes are supported

  1 coil read

  2 input read

  3 multiple register read

  4 input register read

  5 coil write

  6 register write

  15 multiple bit write

  16 multiple register write

• up to 100 entries in the command list, each fully configurable for function, register to/from addressing and word/bit count/word and byte swap
• conditional and continuous command list polling
• event driven bit and register write commands
• communication error codes returned to ladder logic on a per command basis
• configuration possible via ladder logic or by simple file text file download to configuration/debug port.

hardware specifications

• application serial ports (prt1, prt2)- application port to db-9m pc compatible connector is supplied- rs232/422/485 jumper se-lectable- rs232 handshaking configurable- 500v optical isolation from backplane

• form factor- single slot - 94 backplane compatible- locate in any slot of backplane
• dimensions- 46 mm x 94 mm x 75 mm- 1.8 in x 3.7 in x 2.95 in- weight 200 g (approximay
• backplane current load- 20 ma @ 5 v
• external power supply- 12-24vdc- 340 ma to 170 ma
• operating temperature- 0 to 55 deg c (32 to 140 deg f)
• storage temperature- from -40 to 85 deg c (-40 to 185 deg f)
• shock- 30g operational- 50g non-operational- 5 g from 10 - 150 hz
• relative humidity- 5-95% (w/o condensation)
• led indicators- module status- backplane transfer status- application status- serial activity and error led status
• configuration serial port (prt1)- db-9m pc compatible- rs-232- hardware handshaking
• application serial port (prt2)- db-9m pc compatible- rs232/422/485 jumper se-lectable- 500v optical isolation from backplane

ordering information