Saia PCD4.B900 Modules

Technical Dossier

Product Details And Specifications

Saia Burgess PCD4 Series Technical Notes

The PCD4 CPU modules support the S-Bus communication protocol natively, enabling peer-to-peer networking between controllers without additional gateway hardware. The platform is compatible with PG5 programming software and supports IEC 61131-3 languages including Structured Text, Function Block Diagram, and Instruction List. Field installations of PCD4 hardware remain active in facilities with 20+ year operational horizons, making spare parts availability a critical procurement concern for maintenance engineers and plant operators.

The Evolution of PCD4 Architecture

The PCD4 platform succeeded the earlier PCD2 and PCD3 families, introducing a wider backplane bus, higher-density I/O modules, and expanded memory addressing. Early PCD4 deployments used serial S-Bus at 9600–38400 baud for inter-node communication. Subsequent hardware revisions introduced Ethernet-capable CPU variants and expanded the analog I/O resolution from 12-bit to 16-bit on select modules.

PCD4 Full Catalog & Functionalities (SKU List)

CPU & Controller Modules

• PCD4.M170: Base CPU module, 128KB program memory, S-Bus master, onboard serial port.
• PCD4.M175: Enhanced CPU, 512KB program memory, dual serial ports, extended instruction set.
• PCD4.M480: High-performance CPU with Ethernet interface, 2MB memory, supports PG5 remote programming.

Digital Input Modules

• PCD4.B100: 16-channel 24VDC digital input module, sink/source configurable.
• PCD4.B200: 32-channel 24VDC digital input, high-density format, LED status per channel.
• PCD4.B310: 16-channel 120VAC digital input module, optically isolated.
• PCD4.B400: 8-channel 230VAC digital input, surge-protected, DIN rail mount.

Digital Output Modules

• PCD4.B500: 16-channel 24VDC transistor output, 0.5A per channel, short-circuit protected.
• PCD4.B600: 8-channel relay output, 250VAC/2A, Form C contacts.
• PCD4.B700: 16-channel relay output, 24VDC/120VAC, 1A per channel.
• PCD4.B800: 32-channel 24VDC transistor output, high-density, group fusing.
• PCD4.B900: Combined 16 DI / 8 DO digital I/O module, 24VDC, mixed-function backplane card for space-constrained rack configurations.

Analog I/O Modules

• PCD4.C100: 8-channel analog input, 0–10V / 4–20mA selectable, 12-bit resolution.
• PCD4.C200: 4-channel analog output, 0–10V / 4–20mA, 12-bit DAC.
• PCD4.C340: 4-channel analog input + 2-channel analog output combo module, 16-bit resolution.

Communication & Specialty Modules

• PCD4.E100: S-Bus Ethernet gateway module, 10/100 Mbps, enables legacy PCD4 racks on TCP/IP networks.
• PCD4.E110: Profibus-DP slave adapter, connects PCD4 I/O to third-party Profibus masters.
• PCD4.E150: CANopen communication module, 1Mbps, for integration with drive and sensor networks.
• PCD4.W600: Power supply module, 24VDC input, 5VDC/3A backplane output, redundancy-capable.

Quality Control for the PCD4 Range

PCD4 modules undergo a structured inspection and functional test protocol prior to dispatch. The backplane edge connector is inspected for pin deformation, oxidation, and mechanical wear. Digital I/O modules are bench-tested under simulated field conditions: input channels are verified against known voltage thresholds, and output channels are load-tested at rated current to confirm switching integrity and protection circuit function.