SAIA PCD3.M5540

Product Name:​ Saia PCD3.M5540 High-Performance CPU Basic Module
Product Introduction:​ A top-tier PCD3 processor unit built around a 32-bit RISC CPU for complex building management and industrial sequences with fieldbus master/slave duties.
Category:
Description
Technical Specifications:
  • Processor:​ 32-bit RISC, up to 100 MHz
  • Memory:​ 32 MB RAM, 32 MB Flash, 1 MB program memory, 2 MB backup flash, optional file system up to 4 GB via PCD7.Rxxx flash card
  • Communication:​ Ethernet TCP/IP 10/100 Mbit, Profibus-DP slave (1.5 Mbit/s), USB for PG5, RS-485 S-Bus/Modbus RTU
  • I/O Capacity:​ Up to 1023 centralized I/O points
  • Power Supply:​ 24 V DC ±20 % (or 19 V AC rectified), typical 4–8 W
  • Backup:​ Lithium battery for RTC and retentive variables
  • Environment:​ 0…+55 °C operating, -20…+70 °C storage, 30–95 % RH non-condensing, IP20
  • Dimensions / Weight:​ 180 × 28.5 × 63.8 mm, ~820 g
    Functional Features:​ Integrated web server (on variants with file system), multitasking OS (COSinus), floating-point math, alarm buffering, SNMP/BACnet-ready with option card.
    Application Scenarios:​ Campus energy centers, pharmaceutical batch control, multi-protocol gateway between Profibus-DP field devices and Ethernet SCADA.
    Installation Notes:​ Leave 10 mm lateral ventilation gap; use shielded CAT5e for Ethernet; battery must be inserted before first power-on to avoid RTC drift.
    Usage Precautions:​ Profibus-DP on M5540 is slave only—pair with a DP master PLC or drive; do not hot-swap flash card while RUN LED is green.
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