TAIYO PQC-CU-02

Technical Dossier

Product Details And Specifications

TAIYO PQC Series Technical Notes

The TAIYO PQC (Programmable Quality Controller) series is a modular industrial automation platform deployed across high-demand process environments including chemical plants, petroleum refineries, nuclear power facilities, and precision manufacturing lines. Engineered for deterministic real-time control, the PQC architecture supports distributed I/O expansion, multi-axis coordination, and fieldbus communication — making it a long-cycle installed base across Asia-Pacific and European heavy industry. The series occupies a mid-to-high tier in TAIYO's industrial control portfolio, positioned between entry-level relay logic replacements and full-scale DCS platforms. Its backplane-based modular design allows field engineers to replace individual function modules without full system shutdown, a critical requirement in continuous-process industries.

The Evolution of PQC Architecture

The PQC series was introduced as TAIYO's response to the shift from hardwired relay panels to programmable logic in quality-critical manufacturing. Early revisions (PQC-CU-01 generation) used proprietary backplane communication at fixed baud rates with limited I/O addressing. Mid-generation revisions introduced the PQC-BP-08 extended backplane, doubling addressable slot count and enabling mixed analog/digital I/O configurations on a single rack. Later firmware revisions added Modbus RTU and PROFIBUS DP compatibility via dedicated communication adapter modules (PQC-CM-01, PQC-IF-01), allowing integration into plant-wide SCADA and DCS environments without replacing the core CPU infrastructure.

TAIYO PQC Full Catalog & Functionalities (SKU List)

The following SKUs represent the documented PQC series module range, classified by functional category. Each module is designed for slot-based installation on PQC-compatible backplanes.

CPU / Controller Modules

• PQC-CU-01: First-generation CPU module; fixed scan cycle; 4KB program memory; RS-232 port.
• PQC-CU-02: Mid-generation CPU module; extended instruction set; dual serial ports; 16KB program memory; supports structured text and ladder logic.
• PQC-CU-03: Current-generation CPU; 64KB program memory; Ethernet port onboard; supports IEC 61131-3 programming environments.

Digital Input (DI) Modules

• PQC-DI-01: 16-channel 24VDC digital input; sink/source configurable; 3ms input filter.
• PQC-DI-02: 32-channel 24VDC digital input; high-density format; optical isolation per channel.
• PQC-RI-01: 8-channel relay contact input; rated 250VAC/30VDC; for dry contact field devices.

Digital Output (DO) Modules

• PQC-DO-01: 16-channel transistor output; 24VDC; 0.5A per channel; short-circuit protection.
• PQC-DO-02: 8-channel relay output; 250VAC/2A per channel; for actuator and solenoid control.

Analog Input (AI) Modules

• PQC-AI-01: 8-channel analog input; 4–20mA / 0–10V selectable; 12-bit resolution.
• PQC-AI-02: 4-channel high-precision analog input; 16-bit resolution; for pressure and flow transmitters.
• PQC-TC-01: 4-channel thermocouple input module; supports J, K, T, E type; cold junction compensation onboard.

Analog Output (AO) Modules

• PQC-AO-01: 4-channel analog output; 4–20mA; 12-bit DAC; for control valve positioners.
• PQC-SV-01: 2-channel servo/stepper positioning output; pulse+direction interface; for precision axis control.

Communication & Network Modules

• PQC-CM-01: Modbus RTU/ASCII master/slave communication adapter; RS-485 interface.
• PQC-IF-01: PROFIBUS DP slave interface module; up to 12Mbps; GSD file available.
• PQC-NT-01: Ethernet TCP/IP communication module; Modbus TCP support; for SCADA integration.

Power Supply & Backplane

• PQC-PS-01: 24VDC rack power supply module; 5A output; over-voltage and over-current protection.
• PQC-BP-04: 4-slot backplane; supports CPU + 3 I/O modules; DIN rail mount.
• PQC-BP-08: 8-slot backplane; supports CPU + 7 I/O modules; extended rack configuration.

Sourcing Hard-to-Find & Obsolete PQC Parts

Several PQC series modules — particularly first-generation CPU units (PQC-CU-01), early analog input modules, and 4-slot backplanes — have reached end-of-active-production status. TAIYO no longer manufactures these part numbers through standard distribution channels. However, the installed base across refineries, chemical processing plants, and utility infrastructure means demand for replacement units remains consistent.

Quality Control for the PQC Range

PQC series modules present specific test challenges due to their backplane-dependent communication architecture. Standalone bench testing of I/O modules requires a compatible backplane and CPU to initialize the module bus. DriveKNMS operates a dedicated PQC test rack configured with PQC-BP-08 backplane and PQC-CU-02 CPU to simulate live system conditions.