modbus plus communication module

mvi46-mbp

the mvi46 modbus plus communication module allows rockwell automation slc i/o compatible processors to interface easily with other modbus plus protocol compatible devices.

the modbus plus module is a powerful module designed with both master and slave support, enabling easy connection to other modbus devices (modicon processors and many others).

features and benefits

compatible devices include not only modicon plcs (which all support the modbus plus protocol) but also a wide assortment of end devices licensed through the modconnect program. the mvi46-mbp module acts as an input/output module between the modbus plus network and the rockwell automation backplane. the data transfer from the slc processor is asynchronous from the actions on the modbus plus network. a 4000-word register space in the module exchanges data between the processor and the modbus plus network.

these modules allow rockwell automation platforms to connect directly on modbus plus networks as a peer. in addition, the modules act as slaves to processors that must read/write data from the module"s memory.

crossing all industrial boundaries, potential applications include the connection of rockwell automation processors to modicon processors, and the connection of modbus plus speaking devices such as drives, relays, and power monitor hardware to the rockwell automation backplanes.

general specifications

• single slot – 1746 backplane compatible (local or extended i/o rack only. remote rack not supported)
• the module is recognized as an input/output module and has access to processor memory for data transfer between processor and module using m0/m1 files
• ladder logic is used for data transfer between module and processor
• configuration data obtained through user-defined ladder. sample ladder file included

hardware specifications

applications

applications using the modbus communication module can be found in many industrial sectors and in the following applications

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

functional specifications

• communication parameters
  • baud: 57,600 (fixed)
  • parity: none (fixed)
  • stop: 1 (fixed)
• modbus plus ports
  • memory usage is user definable
  • support for the storage and transfer of up to 4,000 registers across the backplane
  • 100 word reads and writes (max. allowed)
  • supports all five levels of modbus plus routing
  • software configurable parameters node address: 1-64
  • global out size: 0-32 words
  • global in size: 0-32 words
  • module data transfer: 0 to 4,000 words
  • master command count.: 0 to 100 commands
  • function codes supported: 1, 2, 3, 4, 5, 6, 15, 16.

global data specifications

the mbp module actively exchanges global in (32 words max. per node) and global out (32 words max.) data on the modbus plus network. priority is given to these data types to provide a high speed mechanism for the transfer of control data.

modbus slave mode specifications

• supports broadcast commands from host
• communication error codes returned to ladder logic

modbus master mode specifications

• command list support of up to 100 commands
• conditional and continuous command list polling
• each command list entry is fully configurable for function register to/from addressing and word/bit count/word and byte swap
• event driven bit and register write commands (ladder logic controlled)
• supports sending of broadcast commands
• communication status error codes returned to ladder logic on a per command basis

hardware specifications

• connector- 2 standard modbus plus - dp-9f

• led indicators- modbus plus status (green)

ordering information