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MVI56-MDA4 is a
COMMUNICATIONS MODULE specifically designed for the MDA Scientific CM4 gas analyzer in industrial environments. Its core function is to enable seamless integration between Rockwell Automation’s ControlLogix processor and MDA Scientific CM4 gas monitoring hardware, acting as a communication bridge between the two. It is suitable for industries that produce, utilize, or come into contact with toxic and corrosive gases (such as petrochemicals, environmental monitoring, and chemical manufacturing), and is particularly well-suited for scenarios requiring centralized control and data management of gas monitoring systems via the ControlLogix processor.
As part of the ProSoft inRAx product line, this module features high compatibility, stable data transmission capability, and flexible configuration options. Leveraging ProSoft’s global technical support network, it delivers a reliable solution for gas monitoring and control requirements in industrial field applications.
related documents
MVI56-MDA4 user manual.pdf
MVI56-MDA4.pdf
Core Functions and Advantages
Communication Bridge Function
The module acts as an input/output unit between the CM4 gas monitoring network and the Rockwell Automation Backplane, enabling bidirectional data interaction. Data transmission between the ControlLogix processor and the CM4 network adopts an asynchronous mode, which prevents mutual interference and ensures the independence and stability of data transmission.
Large-Capacity Data Exchange Space
It has a built-in register space of 5,000 words, dedicated to data flow exchange between the processor and the CM4 network. The module supports the transmission of multiple data types including binary, integer, ASCII and floating-point, meeting the real-time transmission requirements of various parameters in gas monitoring (such as gas concentration, equipment status, alarm information, etc.).
Dual CM4 Master Port Configuration
Equipped with two fully configurable serial ports (PRT1 & PRT2), each port supports the CM4 master device function. A single port can connect up to 10 CM4 devices, and the entire module supports a total of 10 CM4 device accesses, making it suitable for multi-device distributed gas monitoring scenarios.
Rich Instruction Support
The module supports 4 types of read instructions and 5 types of write instructions, covering the core operation requirements of gas monitoring systems.
- Read instructions include:
- Acquire system information (0x30)
- Retrieve equipment status (0x31)
- Query alarm history (0x36)
- Get current monitoring point status (0x37)
- Write instructions include:
- Reset faults or alarms (0x51)
- Set secret keys (0x52)
- Lock the keyboard (0x53)
- End monitoring point lock (0x60)
- Initiate monitoring point lock (0x61)
Comprehensive control and status query of CM4 devices can be realized through the above instructions.
Convenient Configuration and Debugging
Supports parameter downloading via configuration text files (including sample configuration files) and provides sample ladder logic programs, allowing users to directly conduct secondary development based on the samples and reduce programming workload.
The module is equipped with a debug/configuration port (CFG, RJ45 interface, with DB-9M adapter cable), which supports RS-232 communication for on-site connection to a computer for parameter debugging and status diagnosis.
Detailed Specifications
General Specifications
Backplane Compatibility
Single-slot design, compatible with the 1756 series backplane, supporting local or remote chassis installation.
Device Recognition Type
Recognized as an input/output module by the ControlLogix processor, allowing direct access to the processor memory for data transmission.
Data Transmission Method
Data interaction between the module and the processor is realized via Ladder Logic.
Configuration MethodParameters are downloaded based on configuration text files, with support for software configuration via the processor’s ladder logic.
Hardware Specifications
Backplane Current Load
800 mA @ 5V
Operating Temperature
0 ~ 60°C (32 ~ 140°F)
Storage Temperature & Shock Resistance
Storage temperature ranges from -40 ~ 85°C (-40 ~ 185°F); shock resistance stands at 30g during operation and 50g when not in operation.
Relative Humidity
5% ~ 95% (non-condensing)
Vibration Resistance
5g vibration intensity at a frequency range of 10 ~ 150 Hz
LED Indicators
Includes module status light, backplane transmission status light, application status light, and serial activity light, facilitating intuitive diagnosis of equipment operating status.
Port Configuration
- Configuration Port (CFG): RJ45 interface (with DB-9M cable), supporting RS-232 only.
- Application Ports (PRT1/PRT2): RJ45 interfaces (with DB-9M cables), supporting RS-232/485/422, and equipped with 500V optical isolation protection.Accessories SuppliedRJ45-to-DB-9M cable for each port, plus a 6-foot RS-232 configuration cable.
Communication Parameter ConfigurationBaud rate: 110 ~ 115200 baud; parity: none/odd/even; data bits: 5 ~ 8 bits; stop bits: 1/2 bits; RTS switching timing: 0 ~ 65535 ms; response timeout: 0 ~ 65535 ms;
polling delay: 0 ~ 65535 ms.
- Slave Device Support CapacityA single module supports up to 10 CM4 slave devices.
- Protocol Version SupportSupports CM4 protocol versions 1 and 2.
- Data Structure OptionsSupports the "simplified data structure" toggle (Y/N), allowing selection of data transmission format based on actual requirements.
- Status Feedback FunctionCan send equipment operating mode and error codes back to the ladder processor, facilitating fault location and system maintenance.
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