Saia PCD4.U100 Kit System Upgrade Guide

Saia PCD4.U100 System Upgrade Kit: A Smooth Migration Guide from Classic to Modern

In the field of industrial automation, technological iteration and system upgrading are inevitable requirements for maintaining equipment competitiveness and improving operational efficiency. For users using the Saia PCD4 classic series PLC, upgrading their core control system to the new generation PCD2.M5 or PCD3. M series platforms based on NT-OS is an ideal choice to improve performance and extend the system lifecycle. The PCD4.U100 kit was born for this purpose, serving as a bridge between old and new platforms, allowing users to enjoy higher processing speeds and richer features brought by the new CPU while retaining their existing investment in PCD4 I/O modules. This article aims to provide a comprehensive and professional technical reference for automation engineers by delving into the official technical manual of the PCD4.U100 suite, systematically explaining the key technical points, operational steps, and precautions throughout the entire migration process.

Part 1: Migration Preparation and Compatibility Assessment

A successful system upgrade begins with careful planning and comprehensive compatibility checks.

1.1 Core migration process

At the beginning of the manual, a clear migration checklist is provided, outlining the execution path of the entire project:

Hardware check: First, confirm that all existing PCD4 I/O modules can be used in the new system.

Hardware installation: Replace the original PCD4 CPU with the PCD4. U100 kit and install a new PCD2. M5 or PCD3. M series CPU. The original PCD4 I/O module will continue to be used.

Software preparation: Ensure Saia PG5 ®  Develop software version not less than 1.4.300 (patch 15 must be installed) or 2.0.150 (SP1).

Project conversion: Open the original project in PG5. For projects programmed using Fupla (Function Block Diagram) or IL (Instruction List), the system will automatically or manually update the code.

Download and debug: After completing the program adaptation, download the new program to the new CPU and perform system testing.

1.2 Hardware Compatibility Checklist

Before starting the physical installation, it is necessary to strictly check the compatibility list to avoid hardware damage or system failure caused by incompatibility.

Supported CPUs: CD2.M5xxx (firmware version 1.10.16 or higher) and PCD3.Mxxxx (firmware version 1.10.16 or higher). These new CPUs are all equipped with the NT-OS operating system.

Power module: PCD4. N2x0 power module, and the hardware version needs to be B or updated. The manual specifically warns that using older versions of power modules may damage the PCD4.U100 kit, which requires high attention.

Unsupported modules: All PCD4. HXxx series modules (such as high-speed counting, positioning, and other intelligent modules) are not supported. This means that during the upgrade process, if the original system contains such modules, alternative solutions or redesign of related functions need to be sought.

Software version: As mentioned earlier, the specified version or higher of Saia PG5 must be used ® Develop software to ensure that new I/O libraries and functional blocks can function properly.

Part 2: Hardware Installation and Addressing Mode Configuration

The core of hardware installation lies in the connection of the PCD4.U100 kit and the address allocation of new and old I/O modules.

2.1 Role of PCD4.U100 kit

The PCD4.U100 kit is essentially an adapter that connects the new PCD2/3 CPU to the existing PCD4 I/O rack. It converts the high-speed I/O bus of the new CPU into signals that the old PCD4 system can recognize, while processing power and address mapping. The correct installation of this module is the physical foundation for achieving the integration of old and new platforms.

2.2 Selection and Influence of Addressing Modes

This is one of the most critical technical decisions in the migration process, determining how the new CPU "sees" and manages physical I/O points. A micro switch on the back of the PCD4. U100 module provides four addressing modes, with two main modes being the most commonly used:

Mode 1: Address starts from '0' (no new I/O module)

In this mode, the address space of the PCD4 I/O module starts from 0 and is directly mapped to the I/O bus of the new CPU.

Advantages: The original PCD4 program does not require any address changes and can be used directly.

Cost: Unable to add any new PCD2/3 I/O modules to the idle slots of the new CPU. Because address 0 is already occupied. This also means that no intelligent modules (such as PCD2/3. Fxxx communication modules) or memory modules (such as PCD2/3. R6xx) can be added.

Applicable scenarios: Only perform CPU upgrades, do not expand any new hardware, and strive to minimize program changes.

Mode 2: Address starting from '256' (new I/O modules can be added)

In this mode, the addresses of all PCD4 I/O modules are offset by 256. For example, the module with the original address of 0 has its address changed to 256 in the new system.

Advantages: The 0-255 address range on the new CPU bus is released and can be used to install up to 8 new PCD2/3 I/O modules. This provides the possibility for system expansion.