Description
The Hitachi LYA210A is a high-density analog output module designed for use with Hitachi H-Series (H-200, H-300, H-700, and H-2000) Programmable Logic Controllers. It is used to convert digital values from the PLC processor into precise analog current or voltage signals to control proportional valves, variable frequency drives (VFDs), and other actuators.
Product Parameters (Datasheet)
- Model Number: LYA210A
- Module Type: Analog Output (D/A Conversion)
- Number of Channels: 2 independent output channels
- Output Range: * Voltage: 0 to 10V DC, -10 to +10V DC
- Current: 4 to 20mA DC, 0 to 20mA DC
- Resolution: 12-bit binary (1/4095)
- Conversion Speed: Approximately 2.5 ms per channel
- Overall Accuracy: ±0.3% of full scale (at 25°C)
- External Power Supply: 24V DC (+10% / -15%)
- Current Consumption: 150mA (Internal 5V), 100mA (External 24V)
Country of Origin
This PLC module is manufactured by Hitachi, Ltd. in Japan, ensuring high industrial reliability and long-term service life for legacy automation systems.
Application Fields
The LYA210A is a staple in classic industrial automation environments:
- Motor Speed Control: Providing the speed reference signal (0-10V or 4-20mA) to AC and DC motor drives.
- Process Control: Modulating control valves in chemical processing or water treatment plants.
- Temperature Regulation: Controlling power controllers (SCRs) for industrial ovens and heating elements.
- Hydraulic Systems: Interfacing with proportional valves to manage pressure and flow in heavy machinery.
Product Usage Instructions
- Mounting: Insert the LYA210A into a vacant slot on the H-series base unit. Ensure the module is properly seated in the backplane connector before powering on.
- Wiring: Use shielded twisted-pair cables for analog signals to minimize electrical noise. Connect the shield to the designated ground terminal at the PLC end only.
- Mode Selection: Use the on-board DIP switches (located on the side or under the front cover) to select between voltage and current output modes for each channel.
- External Power: This module requires an external 24V DC power source to drive the output loops, especially for 4-20mA configurations.
- Programming: In the Hitachi ladder logic, use the assigned I/O addresses (e.g., WY registers) to send digital values to the module. Ensure your logic accounts for the 12-bit resolution limits (0 to 4095).
Product Technical Description
The LYA210A features high-quality digital-to-analog conversion circuitry with integrated galvanic isolation. Technically, it uses an optical isolator between the PLC’s internal logic and the output circuit to protect the CPU from field-side electrical surges. The module’s 12-bit resolution provides sufficiently fine control for most industrial applications. Its robust design is capable of driving high-impedance loads in voltage mode and standard 500-ohm loads in current mode, making it highly versatile for mixed-component control cabinets.
Q&A (Common Questions)
Q: My output is stuck at 0V/0mA even though the PLC logic is sending data. What is wrong? A: Check the external 24V DC power supply. The LYA210A cannot generate an analog signal without this external “loop power.”
Q: Can I mix voltage and current outputs on the same module? A: Yes, each channel can be independently configured via the internal jumpers or DIP switches, allowing you to run 0-10V on Channel 1 and 4-20mA on Channel 2.
Q: Is this module compatible with the modern Hitachi HX series? A: No, the LYA210A is specific to the legacy H-series. For newer systems, you would need the equivalent module from the HX or EH series.
Q: What is the maximum distance for the analog signal? A: For voltage (0-10V), keep runs under 10 meters to avoid voltage drop. For current (4-20mA), you can typically run several hundred meters if using high-quality shielded cable.
Similar Model Recommendations
- Hitachi LYA200 (Earlier analog output version)
- Hitachi LXA200 (Analog input companion module)
- Hitachi LYA410 (4-channel high-density variant)
- Hitachi LYA211 (Updated version with enhanced diagnostics)
- Hitachi H-252C (Standard CPU for this series)
For technical support or to procure the Hitachi LYA210A, please contact our industrial legacy parts specialists.
