The MVI56E Communication Module allows for Modbus Master and/or Slave connectivity from Rockwell Automation® ControlLogix® processors to Modbus RTU/ASCII devices. Each MVI56E port can be configured as a Master or Slave.
The MVI56E-MCM and MVI56E-MCMXT act as input/output modules on the ControlLogix backplane, making Modbus data appear as I/O data to the processor. Two independently configurable serial ports can operate on the same or different Modbus networks. The MVI56E-MCM is designed for standard process applications and the MVI56E-MCMXT is designed for the Logix-XT™ control platform, allowing it to operate in extreme environments. It can tolerate higher operating temperatures, and has conformal coating to protect it from harsh or caustic conditions.
A conformal coating option is available for this product.
Backward Compatibility |
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10,000 Word Database |
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Add-On Instruction |
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CIPconnect® Enabled |
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Add-On Profile |
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The MVI56E-MCM will operate on a Local or Remote rack (For remote rack applications with smaller data packet size please refer to the MVI56E-MCMR product)
The MVI56E-MCM module accepts Modbus function code commands of 1, 2, 3, 4, 5, 6, 8, 15, 16, 17, 22, and 23 from an attached Modbus Master unit. A port configured as a Modbus Slave permits a remote Master to interact with all data contained in the module.This data can be derived from other Modbus Slave devices on the network, through a Master port, or from the ControlLogix processor.
A port configured as a virtual Modbus Master device on the MVI56E-MCM moduleactively issues Modbus commands to other nodes on the Modbus network. Up to 325 commands are supported on each port. Additionally, the Master ports have an optimized polling characteristic that polls Slaves with communication problems less frequently.The ControlLogix processor ladder logic can issues commands directly from ladder logic or actively select commands from the command list to execute under ladder logic control.
Communication parameters |
Baud Rate: 110 baud to 115.2 kbps |
Modbus Modes |
RTU mode (binary) with CRC-16 |
Floating Point Data |
Floating point data movement supported, including configurable support for Enron and Daniel implementations |
Modbus Function Codes |
1: Read Coils Status |
Command List |
Up to 325 commands per Master port, each fully configurable for function code, slave address, register to/from addressing and word/bit count. |
Optimized Polling |
Configuration options allow Master ports and commands to be optimized to poll slaves with communication problems less frequently. |
Command Status/Error Monitoring |
Command Status or Error codes are generated for each command as it executes, allowing careful monitoring o fcommunication health between the Master and its Slaves. |
Slave Polling Control |
Master Port maintains a Slave Status list of all network Slaves. Polling of each Slave may be disabled and enabled using this list. |
Full Memory Access |
A port configured as a Modbus Slave permits a remote Master to read from or write to any of the 5000 registers that make up the user memory database. |
Multi-source Slave data |
Data presented at the Slave port can be derived from other Modbus Slave devices on a different network through the module's Master port or from the processor tag database. |
Node address |
1 to 247 (software selectable) |
Status Data |
Slave port error codes, counters and statuses are available separately for each port when configured as a Slave |
Specification |
Description |
Backplane Current Load |
800 mA @ 5 Vdc, 3 mA @ 24 Vdc |
Operating Temperature |
0°C to 60°C (32°F to 140°F) - MVI56E-MCM |
Storage Temperature |
-40°C to 85°C (-40°F to 185°F) |
Shock: |
30g Operational |
Relative Humidity |
5 to 95% (without condensing) |
LED Indicators |
Battery Status (ERR) Application Status (APP) Module Status (OK) |
4-Character, Scrolling, Alpha-Numeric LED Display |
Shows Module, Version, IP, Port Master/SlaveSetting, Port Status, and Error Information |
Debug/Configuration Ethernet port (E1 - Config) |
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Ethernet Port |
10/100 Base-T, RJ45 Connector, for CAT5 cable Link and Activity LED indicators Auto-crossover cable detection |
Serial Application ports (P1 & P2) Full hardware handshaking control, providing radio, modem, and multi-drop support |
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Software configurable communication parameters |
Baud rate: 110 baud to 115.2kbps RS-232, 485 and 422 Parity: none, odd or even Data bits: 5, 6, 7, 8 Stop bits: 1 or 2 RTS on/off delay: 0 to 65535 milliseconds |
Serial Applications Ports (P1, P2) |
RJ45 (DB-9M with supplied adapter cable) Configurable RS-232 hardware handshaking 500V Optical isolation from backplane RS-232, RS-422, RS-485 jumper-select, each port RX (Receive) and TX (Transmit) LEDs, each port |
Shipped with Unit |
RJ45 to DB-9M cables for each serial port 5 foot Ethernet Straight-Thru Cable (Gray) |
CB Safety | 504.75 kB | Last Modified 10/06/2021 |
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