Allen Bradley 1771-DMC Control Coprocessor Main Module

Product Introduction

The Allen-Bradley 1771-DMC Control Coprocessor Main Module is a specialized control module designed for use within PLC-5 automation systems developed by Allen-Bradley. The module functions as a dedicated coprocessor that enhances the processing capability of the main controller by handling complex control tasks independently from the primary PLC processor.

In many industrial automation environments, certain operations such as high-speed calculations, advanced motion control logic, and complex data processing require additional computing capability beyond standard PLC execution cycles. The 1771-DMC module addresses this requirement by operating as a parallel processing unit inside the PLC rack, allowing demanding control algorithms to be executed without overloading the central processor.

Installed directly in a 1771 I/O chassis, the module communicates with the PLC-5 system through the chassis backplane. It includes built-in serial communication interfaces that allow connection to external devices, engineering workstations, or diagnostic systems. These communication ports enable efficient data exchange, parameter configuration, and monitoring during system operation.

With its dedicated processing architecture and reliable industrial design, the 1771-DMC module is commonly applied in automation systems that require precise control timing, high-speed processing, and reliable communication within PLC-based control platforms.

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Product Specifications

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Applications

● Advanced Control Processing
Used to execute complex control algorithms and high-speed processing tasks that require additional computing capability within PLC systems.

● Motion and Machine Control Systems
Applied in automated machinery where precise control timing and fast response are required.

● Industrial Automation Platforms
Supports large PLC-based automation systems that require distributed processing capabilities.

● Process Monitoring Systems
Allows advanced data processing and control calculations in industries such as chemical processing and manufacturing.

● System Communication Integration
Provides serial communication interfaces for connecting engineering stations, diagnostic tools, and external control equipment.

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Advantages

● Dedicated Processing Capability
Operates as an independent coprocessor, reducing the workload on the main PLC processor.

● Fast Data Processing
With a 1 ms update period, the module supports rapid control calculations and quick response times.

● Reliable Industrial Communication
Integrated RS-232 communication ports allow connection to external monitoring or configuration devices.

● Seamless PLC-5 Integration
Designed specifically for 1771 I/O systems, ensuring compatibility with PLC-5 architectures.

● Stable Backplane Communication
Utilizes the chassis backplane for efficient data exchange between the coprocessor and the main controller.

● Flexible Control Expansion
Provides additional processing resources that allow complex automation tasks to be implemented within existing PLC systems.

FAQ

1. What is the primary function of the 1771-DMC module?
   The module operates as a coprocessor that performs advanced control calculations and processing tasks in parallel with the PLC processor.

2. How does the module communicate with the PLC system?
   Communication occurs through the chassis backplane, allowing the module to exchange data with the PLC-5 processor and other installed modules.

3. What type of communication interfaces are available on the module?
   The module includes a 9-pin and a 25-pin EIA RS-232C serial communication port for external device connectivity.

4. What role does the update period play in system performance?
   The update period determines how quickly the module processes and updates control calculations, allowing high-speed control operations.

5. What type of applications typically use the 1771-DMC module?
   It is commonly used in systems requiring complex control algorithms, motion control processing, or specialized automation tasks.

6. How is the module installed in the PLC system?
   The module is installed into a slot in the 1771 I/O chassis where it connects to the backplane for communication and power.

7. Does the module replace the PLC processor?
   No, it operates alongside the PLC processor as a supplemental processing unit.

8. Can the serial ports be used for diagnostics or configuration?
   Yes, the RS-232 ports allow engineers to connect programming devices or monitoring systems for configuration and troubleshooting.

9. What type of wiring interface does the module use?
   The module uses the 1771-WB wiring arm for secure electrical connections.

10. How does the coprocessor improve system efficiency?
    By handling complex calculations separately, it allows the main PLC processor to focus on standard control tasks.

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