YASKAWA DDSCR-R84H Programmable Logic Controller

The YASKAWA DDSCR-R84H is a legacy high-performance Central Processing Unit (CPU) module belonging to the Memocon-SC series of Programmable Logic Controllers (PLCs). 

It was widely used in industrial automation during the late 1990s and early 2000s, specifically for complex motion control and logic processing.

1. Introduction

The DDSCR-R84H (often designated with an "-M" suffix) serves as the "brain" of a Memocon-SC R84H system.

 It is designed to handle high-speed logic operations and manage data processing tasks like arithmetic calculations and numerical comparisons. 

A key physical feature of this board is the Memory Protect ON/OFF switch, which prevents accidental overwriting of the control program.

2. Technical Parameter Table

Data Processing Capabilities: Unlike simpler PLCs of its era, the R84H can perform complex addition, subtraction, multiplication, and division directly using register modules.

Flexible I/O Allocation: Supports a mix of BCD (3-digit) and Binary (10-bit or 16-bit) data forms within the same slot configuration.

Robust Diagnostic Interface: The front panel typically includes status LEDs for "RUN," "ERR," and communication activity to simplify troubleshooting.

Industrial Hardening: Designed for high-reliability in environments with a wide temperature range (up to 55°C) and resistance to electrical noise.

4. Application Cases

Because of its motion control heritage, the DDSCR-R84H was frequently used in:

Large-scale Conveyor Systems: Managing complex routing logic and motor synchronization.

Automotive Parts Manufacturing: Controlling dedicated machine tools and metalworking equipment.

Palletizing & Packaging: Coordinating high-speed I/O signals from sensors and actuators to manage product flow.

Legacy Robot Cells: Often interfaced with early Yaskawa robot controllers for auxiliary logic tasks.

5. Other Models in the Same Series

The Memocon-SC family includes several CPU and specialized modules that are often interchanged or used alongside the R84H:

DDSCR-GL60H / GL20: Advanced versions for larger-scale processing requirements.

DDSCR-U84 / U84S: Parallel CPU models with different memory or speed capacities.

JAMSC-B1071: Register Input Module commonly used with the R84H for numerical data entry.

JAMSC-B1058: Standard Output Module for the Memocon-SC rack.

Note: The DDSCR-R84H is currently discontinued by Yaskawa. If you are maintaining an existing system, it is recommended to keep a "New Surplus" or "Refurbished" unit as a spare.

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