HITACHI LYD105A Digital Input Module

The HITACHI LYD105A is a high-performance digital input module designed for seamless integration with Hitachi's series of programmable logic controllers (PLCs). It provides 16 independent input channels, each capable of accepting 24 VDC signals from field devices such as proximity sensors, limit switches, and pushbuttons. The module is engineered for reliable operation in harsh industrial environments, featuring optical isolation between field and logic sides, as well as built-in EMI/RFI filtering to prevent false triggering.

Key Features

• 16-Channel High-Density Input: Maximizes I/O capacity in a single slot, reducing panel space and overall system cost.

• Wide Input Voltage Range: Accepts 24 VDC nominal (12–30 VDC) with polarity protection, compatible with most industrial sensors.

• High-Speed Response: Typical response time of less than 1 ms, suitable for high-speed counting and position detection.

• Optical Isolation: 1500 VAC isolation between field and logic circuits ensures safety and noise immunity.

• LED Status Indicators: Each channel has a bright LED for quick visual confirmation of input status, simplifying troubleshooting.

• Removable Terminal Blocks: Facilitates easy wiring and module replacement without disturbing field wiring.

Technical Specifications

• Number of Inputs: 16 (sinking/sourcing selectable via common wiring)

• Input Voltage: 24 VDC nominal (operating range 12–30 VDC)

• Input Current: Typically 5 mA at 24 VDC

• ON Voltage Threshold: ≥15 VDC

• OFF Voltage Threshold: ≤5 VDC

• Response Time: OFF→ON ≤ 0.5 ms, ON→OFF ≤ 0.5 ms

• Isolation: 1500 VAC between field and logic, 500 VAC between groups

• Operating Temperature: -20°C to +60°C

• Certifications: CE, UL, cUL

Applications

The LYD105A is widely used in automated assembly lines, packaging machinery, material handling systems, and process control where reliable digital signal acquisition is critical. It interfaces directly with Hitachi PLCs through the backplane, providing real-time data for logic execution and monitoring. Its fast response makes it ideal for applications requiring precise timing, such as conveyor tracking and machine safety interlocks.

Integration and Configuration

When installed in a compatible Hitachi PLC rack, the LYD105A is automatically recognized by the CPU. I/O mapping and filter settings can be configured using Hitachi's programming software (e.g., Pro-H or EC Runner). The module supports both sinking and sinking/sourcing wiring configurations, giving engineers flexibility in connecting various sensor types. Diagnostic information, including module status and channel faults, is accessible via the PLC's diagnostics menu.

Reliability and Environmental Compliance

Built to withstand industrial extremes, the LYD105A operates reliably in temperatures ranging from -20°C to 60°C and is resistant to vibration and shock per IEC standards. Its conformal-coated circuit boards protect against humidity and corrosive atmospheres. The module meets CE and UL safety requirements, ensuring safe operation in global markets.

With its robust design and high-speed performance, the HITACHI LYD105A digital input module is a trusted choice for expanding PLC digital input capabilities in demanding automation applications.