Rockwell ProSoft MVI56-MCM Modbus master-slave communication module

Rockwell ProSoft MVI56-MCM Modbus master-slave communication module

ProSoft MVI56-MCM is a product designed specifically for Rockwell Automation ®  ControlLogix ®  The Modbus master-slave communication module designed by the processor enables convenient integration between the ControlLogix system and other devices that support the Modbus protocol, such as PLCs, process control devices, and SCADA systems. As an interface module between the Modbus network and the ControlLogix backplane, it has high compatibility, ease of configuration, and reliable communication performance.

Core Features and Advantages

The module meets the flexible communication and efficient operation and maintenance needs in industrial scenarios through targeted design. The core features and corresponding values are as follows:

Characteristics classification, specific characteristics, advantages

Backboard technology authorized by Rockwell Automation; Support 1756 backplane single slot installation (local/remote rack) 1. Implement high-speed data transmission between modules and ControlLogix processors

2. Compatible with ControlLogix system architecture, no additional hardware adaptation required

The protocol supports Modbus RTU (binary, with CRC-16 checksum) and Modbus ASCII (with LRC error checksum) protocols; Support floating-point data transmission (including Enron and Daniel) ®  1. Adapt to the communication requirements of different Modbus devices, with wide compatibility

2. Meet the transmission requirements of high-precision data (such as flow and temperature) in industrial scenarios

Configuration and Monitoring 1. Based on RSLogix ™  5000 configuration, supports viewing module data and status through controller tags

2. Provide example ladder diagrams with complete annotations (including user-defined data types, steps, and labels), which can be used in most scenarios without modification

3. LED diagnostic indicator lights (module status, backplane transmission status, application status, serial activity)

4. Menu driven hardware and protocol diagnostic tools; Support viewing module database content through serial port connection to PC 1. Reduce configuration threshold and shorten deployment time

2. Operations personnel can quickly locate faults (such as communication interruptions, module abnormalities), reducing downtime

20 years of experience in developing industrial communication solutions with technical support and warranty; Global free unlimited technical support (pre-sales, deployment, troubleshooting); 3-year warranty: 1. Ensure long-term stable operation of equipment and reduce maintenance risks

2. Global service network ensures timely access to support and adapts to cross-border project needs

Functional specifications

The module supports both Modbus master and slave modes, allowing for flexible configuration of port roles according to different communication topology requirements.

（1） Modbus master mode

After configuring the port as a master, it can actively send instructions to slave devices in the Modbus network, with intelligent polling and detailed status feedback capabilities:

Instruction configuration: Each master port supports up to 100 configurable instructions, each of which can customize function codes, slave addresses, register read/write addresses, and word/bit counts.

Polling strategy: supports flexible instruction list polling configuration, including continuous polling, polling when data changes, and can be manually or automatically enabled for polling; For slave stations with abnormal communication, the polling frequency will be automatically reduced to optimize network resource utilization.

Status feedback: Provide error codes for individual instructions and maintain a list of slave status for each active master port for troubleshooting purposes.

（2） Modbus Slave Mode

The port is configured to allow remote master access to all data within the module after the slave station (data can come from other Modbus slave stations in the network, master station ports, or the module itself):

Node address: Supports 1-247 software selectable addresses, suitable for multi device networking requirements.

Status monitoring: Each configured slave port provides error codes, counters, and port status data, providing real-time feedback on communication health.

（3） Supported Modbus Function Codes

Covering commonly used read and write operations in industrial scenarios to meet data collection and control requirements:

Function code function description applicable mode (master/slave)

1. Read the status of the coil from the master station (sending) and slave station (responding)

2. Read input status: master station (sending), slave station (responding)

3 Read and hold register master (send), slave (respond)

4. Read input register master (send), slave (respond)

5. Force (write) a single coil master station (send), slave station (respond)

6 preset (write) single hold register master (send), slave (respond)

8 Diagnosis (only supports sub function 00) Only slave station (response)

15. Force (write) multiple coil master stations (send) and slave stations (respond)

16 preset (write) multiple hold registers master (send), slave (respond)

Report 17: Slave ID Only Slave (Response)

22 Block Write Keep Register Only from Slave Station (Response)

23 Read Write Keep Register Only Slave (Response)

Hardware specifications and interfaces

（1） Basic hardware parameters

Detailed description of specification category

Backboard current consumption: 800mA at 5VDC; 3mA at 24Vdc

Working temperature: 0 ° C -60 ° C (32 ° F -140 ° F)

Storage temperature -40 ° C -85 ° C (-40 ° F -185 ° F)

Impact resistance performance working state: 30g; non working state: 50g

Anti vibration performance 5g at frequencies of 10Hz-150Hz

Relative humidity 5% -95% (non condensing)

LED indicator light module status light, backplane transmission status light, application status light, serial activity light

（2） Interface configuration

The module provides multiple dedicated interfaces to meet configuration, communication, and expansion requirements:

Configure/debug ports (CFG):

Interface type: RJ45 (including matching DB-9M adapter cable)

Communication standard: Only supports RS-232

Purpose: To connect to a PC for module configuration, diagnosis, and database viewing.

Application ports (PRT1&PRT2):

Interface type: RJ45 (including matching DB-9M adapter cable)

Communication standard: Supports RS-232/485/422, with full hardware handshake control (suitable for radio stations, modems, and multi machine networking scenarios)

Communication parameters: baud rate 110-115200 baud (depending on the protocol); Data bits 5/6/7/8; Stop position 1/2; Check bit none/odd/even; RTS switch delay 0-65535 milliseconds (software configurable).

（3） Accompanying accessories

RJ45 to DB-9M cable (1 per port)

6-foot RS-232 configuration cable