Saia PCD PCA1 Modules SAIA PCA1.M41M4

Name: Saia PCD PCA1 Modules SAIA PCA1.M41M4
Brand: SAIA-Burgess

Model: PCA1.M41M4

Brand SAIA-Burgess

Series Saia PCD PCA1

Model PCA1.M41M4

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Technical Dossier

Product Details And Specifications

Saia PCD PCA1 Series Technical Notes

The Evolution of PCA1 Architecture

The Saia PCD platform originated in the 1980s as a modular PLC architecture targeting European industrial automation markets. The PCA1 designation identifies a specific processor board form factor within the PCD1/PCD2/PCD3 chassis family. Early PCA1 variants operated on proprietary Saia instruction sets with serial communication via RS-232/RS-485. Subsequent generations introduced PROFIBUS-DP master/slave capability, Ethernet TCP/IP connectivity, and expanded memory addressing. The PCA1.M41M4 represents a mature iteration with 512 KB program memory, integrated real-time clock, and support for up to 4 communication ports. Compatibility across PCD chassis generations is not universal: PCA1 boards are mechanically and electrically specific to their designated chassis backplane. Migration from PCA1 to PCD3.M5560 or PCD3.M6560 processors requires firmware re-compilation and I/O address remapping. For installations where chassis replacement is not feasible, PCA1 board-level repair and tested-used sourcing remain the primary lifecycle extension strategies. The PCD platform has entered a mature/maintenance phase; Saia-Burgess (now part of Honeywell) continues to supply spare parts but new PCA1 processor development has ceased, making secondary market sourcing critical for long-term site support.

PCA1 & PCD Series Full Catalog & Functionalities (SKU List)

CPU / Processor Modules

PCA1.M41M4: PCD1/PCD2 processor, 512 KB RAM, 4 comm ports, RTC integrated
PCA1.M40M4: PCD1/PCD2 processor, 256 KB RAM, 4 comm ports, standard variant
PCA1.M10: Entry-level PCA1 processor, 64 KB program memory, RS-232 only
PCA1.M15: PCA1 processor with expanded I/O addressing, 128 KB RAM
PCA1.M12: PCA1 mid-range processor, 128 KB RAM, dual serial ports
PCD2.M5540: PCD2 chassis processor, Ethernet + PROFIBUS, 1 MB memory
PCD2.M5560: PCD2 processor with dual Ethernet, extended diagnostics
PCD3.M5560: PCD3 chassis processor, dual Ethernet, USB programming port
PCD3.M6560: PCD3 high-performance processor, 4 MB RAM, web server integrated

Digital I/O Modules

PCD2.M4560: 16 DI / 16 DO mixed digital I/O module, 24 VDC
PCD1.M2120: 8 DI / 8 DO compact digital module for PCD1 chassis
PCD2.M150: 32-channel digital input module, 24 VDC sink/source

Communication & Network Modules

PCD3.M3330: PROFIBUS-DP master communication module for PCD3
PCD3.M5360: Ethernet communication processor, Modbus TCP / S-Bus
PCD7.D232: RS-232/RS-485 serial communication interface module

Power Supply Modules

PCD2.M480: 24 VDC power supply module, 4 A output, for PCD2 chassis

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