1. Product Overview

Product Name: Opto-Isolated 32/32 Channel Digital Input/Output AT Card (Negative Common)
Model: PIO-32/32RL(PC)
Series: PIO Series – Opto-Isolated Digital I/O Interface Boards
Article Number: PIO-32/32RL(PC)
Manufacturer: CONTEC Co., Ltd. (Japan)
Product Category: Industrial Automation / Measurement and Control – Digital I/O Interface Boards
Bus Type: ISA AT Bus (PC/AT compatible)

The CONTEC PIO-32/32RL(PC) is an opto-isolated digital input/output interface card designed for PC/AT-compatible systems. It provides 32 optically isolated input channels and 32 optically isolated output channels, configured for negative common operation. The board is engineered for industrial automation, process control, and data acquisition systems requiring reliable isolation between field I/O and the host computer.

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2. Key Features

- Opto-Isolated I/O: Provides complete electrical isolation between the PC’s internal logic and external I/O circuits using opto-couplers, protecting the system from surges, noise, and ground potential differences.
- 32 Inputs / 32 Outputs: Supports 32 opto-isolated digital input channels and 32 opto-isolated open-collector output channels.
- Negative Common Configuration: Designed for current sourcing circuits (negative common), where the common polarity is reversed relative to current sinking circuits.
- Input Voltage Range: 12–24 VDC input level with 2.2 kΩ input resistance.
- Output Rating: 35 VDC maximum, 150 mA per channel (open collector type).
- High Isolation Voltage: 5 kV isolation between PC logic and I/O interface.
- Interrupt Support: Four independent interrupt request lines (IRQ 3–7, 9–12, 14, 15) can be assigned for event-driven input monitoring.
- Surge and Overcurrent Protection: Built-in Zener diode and protective circuitry prevent damage from voltage surges and overcurrent conditions.
- High Noise Immunity: Opto-coupler isolation and digital filtering ensure stable operation in electrically noisy environments.
- Standard 96-pin Half-Pitch Connector: Provides a compact, high-density interface for external wiring.
- Software Support: Compatible with CONTEC’s API-TOOL driver suite for Windows and Linux, and VI-DAQ library for LabVIEW integration.
- Industrial-Grade Reliability: Designed for continuous operation in industrial control systems, with robust PCB design and high-quality components.

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3. Technical Specifications

| Parameter | Specification |
|----------------|------------------|
| Bus Interface | ISA AT Bus |
| Input Channels | 32 opto-isolated inputs |
| Output Channels | 32 opto-isolated open collector outputs |
| Input Type | Opto-isolated (for high sink current output) |
| Input Voltage Range | 12–24 VDC (negative common) |
| Input Resistance | 2.2 kΩ |
| Output Type | Opto-isolated open collector (current sinking type) |
| Output Rating | 35 VDC, 150 mA max per channel |
| Isolation Voltage | 5 kV (between I/O and PC logic) |
| Response Time (Max) | 200 µs typical |
| Interrupt Lines | 4 IRQ lines selectable from IRQ 3–7, 9–12, 14, 15 |
| Wiring Distance | Up to 50 m (depending on cable and environment) |
| I/O Address Range | Any 8-byte or 16-byte boundary (configurable) |
| Power Consumption | +5 VDC, 250 mA (typical) |
| Dimensions | 160 mm (L) × 122 mm (H) |
| Connector Type | 96-pin half-pitch D-type female connector |
| Isolation Method | Opto-coupler isolation |
| Operating Temperature | 0–50°C (typical industrial range) |
| Storage Temperature | -10–60°C |
| Humidity | 10–90% RH (non-condensing) |
| Weight | Approx. 200 g |
| Mounting | Internal PC/AT expansion slot |

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4. Functionality

The PIO-32/32RL(PC) functions as a digital I/O interface board that allows a PC to monitor and control external devices through optically isolated channels. Each input channel detects the ON/OFF state of external DC signals (12–24 VDC), while each output channel drives external loads such as relays, solenoids, or indicator lamps via open-collector transistors.

Operation Principle:
- Input Section: Each input signal passes through an opto-coupler, converting the external DC signal into a logic-level signal for the PC while maintaining electrical isolation.
- Output Section: Each output channel uses an opto-coupler and transistor driver to switch external loads. The open-collector configuration allows flexible interfacing with various external circuits.
- Negative Common: The board’s negative common configuration means that the common terminal is connected to the negative side of the external power supply, suitable for current sourcing devices.
- Interrupt Function: Input channels can generate interrupts to the host system, enabling event-driven control without continuous polling.

Applications:
- Factory automation and process control systems
- Machine status monitoring and control
- PLC and sensor interfacing
- Data acquisition and test systems
- Industrial equipment control panels
- Safety and alarm monitoring systems

Compatibility:
- Compatible with PC/AT and ISA bus systems.
- Works with CONTEC’s API-TOOL (Windows/Linux) and VI-DAQ (LabVIEW) software environments.

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5. Components & Accessories

Included Components:
- PIO-32/32RL(PC) main board
- User manual and installation guide
- Software driver package (API-TOOL for Windows/Linux)

Optional Accessories:
- Cables:
- PCB96P / PCB96PS – 96-pin half-pitch cable (standard or shielded)
- PCB96W / PCB96WS – 96-pin half-pitch cable (wide type)
- Terminal Blocks:
- EPD-96, EPD-37A, EPD-37 – Terminal block units for easy wiring
- CM-32(PC)E, CM-64(PC)E – Compact terminal modules
- Connector Sets:
- CN5-H96F – 96-pin half-pitch connector set
- Adapters:
- PCA96P, PCA96PS – Conversion adapters for 96-pin connections

All accessories are designed to ensure reliable signal transmission and simplify wiring in industrial environments.

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6. Installation & Setup

System Requirements:
- PC/AT-compatible computer with available ISA expansion slot
- +5 VDC power supply from the system bus
- Supported operating systems: Windows (via API-TOOL), Linux (via API-TOOL for Linux), LabVIEW (via VI-DAQ library)

Installation Steps:
1. Power off the PC and remove the cover.
2. Insert the PIO-32/32RL(PC) card into an available ISA slot.
3. Secure the card with the mounting screw.
4. Connect external devices using a 96-pin half-pitch cable to the board’s connector.
5. Configure I/O address and interrupt settings via DIP switches or software (depending on system).
6. Install the appropriate driver software (API-TOOL or VI-DAQ).
7. Verify operation using the provided diagnostic utilities.

Mounting Options:
- Standard internal mounting in PC chassis
- External wiring via terminal blocks and shielded cables

Configuration:
- I/O address and IRQ lines can be set manually to avoid conflicts with other devices.
- Software configuration allows enabling/disabling interrupts and setting digital filter parameters.

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7. Performance & Capabilities

- Speed: Typical response time of 200 µs ensures reliable detection of digital signals in real-time control applications.
- Capacity: 32 input and 32 output channels provide a total of 64 I/O points per board.
- Efficiency: Opto-isolation minimizes noise coupling and ground loops, improving signal integrity.
- Load Handling: Each output channel supports up to 150 mA at 35 VDC, suitable for driving relays, LEDs, and solenoids.
- Interrupt Handling: Four IRQ lines allow flexible event-driven control, reducing CPU load.
- Distance: Supports wiring distances up to 50 meters, depending on cable type and environment.
- Limitations:
- Designed for DC signals only (12–24 VDC input, 35 VDC output).
- Not suitable for AC signal interfacing.
- Requires external power for driving output loads.

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8. Standards & Compliance

- Bus Standard: ISA AT Bus compliant
- Electrical Isolation: 5 kV opto-coupler isolation between PC logic and I/O interface
- Safety & EMC: Designed to meet industrial noise immunity and surge protection standards
- Environmental Compliance: RoHS-compliant components and lead-free soldering
- Software Standards:
- Windows API-TOOL driver (Win32 API compatible)
- Linux API-TOOL driver (module-style device driver)
- LabVIEW VI-DAQ library (compatible with National Instruments’ Data Acquisition VI format)

Certifications:
- CE Marking (for electromagnetic compatibility and safety)
- Conforms to CONTEC’s industrial-grade quality assurance standards

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9. Additional Information

Warranty:
- Standard manufacturer warranty (typically one year) covering defects in materials and workmanship.

Support & Maintenance:
- Technical support available via CONTEC’s global portal (www.contec.com).
- Software updates and driver downloads provided free of charge.
- Comprehensive documentation and sample code included for rapid integration.

Maintenance Recommendations:
- Periodically inspect connectors and cables for wear or corrosion.
- Ensure adequate ventilation within the PC chassis to prevent overheating.
- Use surge-protected power supplies in industrial environments.

Software Updates:
- API-TOOL and VI-DAQ libraries are regularly updated to support new OS versions and improve performance.
- Latest drivers and manuals can be downloaded from CONTEC’s website.

Related Products:
- PIO-16/16RL(PC): 16 input / 16 output negative common version
- PIO-32/32L(PC): Standard opto-isolated I/O (positive logic)
- PIO-32/32F(PC): High-speed opto-isolated I/O (5 µs response)
- PIO-32/32H(PC): High-voltage I/O (24–48 VDC)

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Summary

The CONTEC PIO-32/32RL(PC) is a robust, opto-isolated digital I/O interface card designed for PC/AT systems requiring reliable, noise-immune digital signal interfacing. With 32 input and 32 output channels, negative common configuration, and 5 kV isolation, it provides a secure and efficient solution for industrial automation, process control, and data acquisition applications. Its support for multiple interrupt lines, surge protection, and comprehensive software compatibility (Windows, Linux, LabVIEW) make it a versatile choice for engineers and system integrators seeking dependable digital I/O performance in demanding environments.