Schneider Electric PC-E984-285 Modicon 984 PLC CPU

The PC-E984-285 is a high-performance CPU for the Modicon 984 family. It offers expanded memory and faster processing than earlier models. This CPU is built for more complex and demanding automation tasks.

Core Technical Specifications

• Brand & Model: Schneider Electric PC-E984-285
• Logic Memory: 32K Words for user program
• Data Memory: 64K Words for data storage and handling.
• Data Registers: 1920 registers (1 word each).
• Scan Time: 2.5 ms per kilobyte of logic, enabling faster control cycles.
• Local I/O Capacity: 256 points in the local chassis.
• Total I/O Capacity: 512 Discrete Inputs and 512 Discrete Outputs.
• I/O Drops: 1 local drop.

Communication & Networking

• Integrated Ports:
  • 2 x Modbus Serial Ports (typically one RS-232 and one RS-485).
  • 1 x Modbus Plus (MB+) Network Port.
• Network Role: Can act as a node or potential manager on a Modbus Plus network for peer-to-peer data exchange.
• Serial Flexibility: Two Modbus ports allow connection to multiple devices like HMIs, drives, or other PLCs on separate networks.

System Context & Application

• Series: A top-tier model within the Modicon 984-2xx series.
• Compatibility: Works with standard 800-series I/O modules in 984 racks.
• Programming: Programmed using legacy software such as Modsoft or ProWORX NxT.
• Legacy Status: A high-end legacy component, crucial for supporting complex existing installations where performance is key.

Package & Support Information

• Package Contents: One PC-E984-285 CPU module.
• Shipping: Securely packaged and shipped worldwide via FedEx, UPS, or DHL.
• Warranty: Covered by a 12-month warranty for reliable operation.
• Support Purpose: Supplied for the maintenance, repair, or like-for-like upgrade of critical legacy Modicon 984 control systems.

Frequently Asked Questions

• Q: How does this model compare to the PC-A984-145?
• A: The PC-E984-285 offers four times the logic memory (32K vs 8K), significantly more data memory (64K vs 2K), and a faster scan time (2.5 ms/k vs 5 ms/k). It also has an extra Modbus port.
• Q: What is the advantage of having two Modbus ports?
• A: It allows you to create two separate serial networks. For example, you could connect an operator terminal (HMI) to one port and a group of variable frequency drives (VFDs) to the other, simplifying wiring and network management.
• Q: Can it control more than 512 I/O points?
• A: The CPU's direct addressing is limited to 512 discrete inputs and 512 discrete outputs. Larger systems would require a network of multiple PLCs or a move to a more modern platform like Modicon Quantum.
• Q: What type of backup battery does it use, and how long does it last?
• A: It uses a standard lithium battery (like the BLP-A) to retain the program and data in RAM when power is off. Battery life is typically 2-5 years, depending on temperature.
• Q: Is technical documentation still available for this CPU?
• A> Yes, while it is a legacy product, reference manuals, data sheets, and programming guides for the Modicon 984 series are still available from Schneider Electric's website or through distributors like us.

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