HITACHI LYT000A | EH-150 PLC Analog Output Module

Description Key Technical Specifications Parameter Specification Part Number LYT000A Product Type Analog Output Module Series EH-150 PLC Channels 2 outputs Output Type 4-20 mA DC (current) Load Resistance 600 ohms maximum Resolution 12-bit (4096 steps) Accuracy ±0.5% of full scale typical Conversion Speed 2 ms per channel typical Isolation Photocoupler isolation between output and PLC internal circuits External Power 24V DC ±10% (loop power required) Current Consumption 80 mA max from 24V DC external supply Indicators Status LED (module operation) Wiring Removable terminal block Mounting EH-150 base rack Condition New Surplus (Original Packaging) Product Introduction The HITACHI LYT000A is a 2-channel analog output module for the EH-150 series programmable logic controllers. It converts digital values from the PLC CPU into proportional 4-20 mA current signals for controlling analog field devices such as control valves, variable frequency drives, and positioning actuators. The module is commonly used in water treatment, HVAC, and light industrial applications. The LYT000A requires external 24V DC loop power and provides 12-bit resolution across the full 4-20 mA range. Each channel is updated independently, and the module includes photocoupler isolation between outputs and the PLC backplane. This unit is new surplus, factory-sealed in original Hitachi packaging. EH-150 components remain in service across many facilities; contact us for current stock and firm pricing. Frequently Asked Questions (FAQ) Q: Is the LYT000A compatible with all EH-150 CPU models? A: Yes, the HITACHI LYT000A works with all EH-150 CPU models—EH-CPU, EH-CPUA, EH-CPU2, and later variants. The EH-150 backplane is universal; any I/O module fits any slot. However, the CPU must support analog I/O in its firmware. Most standard CPUs do, but if you have a very basic CPU, check your I/O capacity. In my experience, LYT000A modules plug into any EH-150 rack and work immediately after configuration. Q: Does the LYT000A require external 24V power, or does it get power from the backplane? A: Both. The LYT000A gets its internal logic power from the EH-150 backplane ( 5V). But the 4-20 mA output loops require external 24V DC power—the module does not generate loop power internally. You must connect 24V DC to the appropriate terminals (typically 24V and 0V on the removable terminal block). Without external power, the module configures and shows status, but outputs stay at 0 mA. This catches people new to Hitachi analog modules. Q: What’s the resolution of the LYT000A, and is it sufficient for precise control? A: 12-bit resolution means 4096 steps over 4-20 mA. That’s about 0.024% of span per step, or roughly 0.004 mA resolution. For most industrial applications—valve positioning, VFD speed control—this is plenty. The HITACHI LYT000A provides smooth analog output without noticeable stepping. If you need higher precision (0.1% or better control), you’d need a 14-bit or 16-bit module. But for 90% of applications, 12-bit does the job. I’ve used modules on chemical feed pumps for years—stable and repeatable. Q: Can I wire the to drive two-wire transmitters or only four-wire devices? A: The is a sourcing output—it controls current by varying resistance in the loop. It’s designed for four-wire devices (valve positioners, drives) that have their own power. For two-wire transmitters (loop-powered devices), you need the module to provide power, which the does not do. If you must drive a two-wire device, you’ll need an external 24V supply and careful wiring. Honestly, it’s simpler to use four-wire devices with this module. Read the manual—Hitachi shows both configurations, but four-wire is cleaner. Q: How do I configure the output range? Can I use 0-20 mA instead of 4-20 mA? A: The HITACHI LYT000A is fixed at 4-20 mA. It does not support 0-20 mA or 0-10V outputs. The hardware is calibrated for 4 mA at zero scale, 20 mA at full scale. In your PLC program, you map 0-4000 (or 0-4095) digital counts to 4-20 mA. If you absolutely need 0-20 mA, you’d need external signal conditioning or a different module. The assumes live zero (4 mA) for open-wire detection—standard in process industries. Q: What do I do if an output gets stuck at a fixed value? A: First, check external 24V power. If power is present, measure voltage at the output terminals with the loop disconnected. You should see a varying voltage as you command different outputs. If voltage changes but current doesn’t when connected to the load, the load may be shorted or open. If voltage doesn’t change, the output channel may be damaged. In my experience, most “stuck output” problems trace to field wiring issues, not the module itself. But if you’ve verified everything and one channel is dead, the needs replacement. Surges from nearby VFDs can kill output transistors. Q: Can I mix modules with other analog modules in the same rack? A: Yes. The EH-150 backplane handles mixed I/O types without issue. You can have analog outputs next to digital input modules, analog inputs, or specialty modules. No slot restrictions. The system automatically allocates I/O addresses based on module type and position. Just be aware that analog modules consume multiple I/O points in the CPU’s memory map—typically 2 words per channel for the . Plan your addressing accordingly. Q: What’s the typical failure mode for modules in the field? A: In my experience: Output transistor failure from surges or shorts on field wiring Power supply section aging—the DC-DC converters fail after 10 years Connector corrosion in humid environments Calibration drift (rare, but happens after many years) The HITACHI LYT000A is built to industrial standards, but it’s not bulletproof. If you lose one channel while the other works, the module is damaged—replace it. We keep spares for critical loops. For non-critical, you can limp along with one channel until replacement arrives. Q: Does this module support hold last value on communication loss? A: The itself doesn’t have onboard intelligence for hold last value. That function must be handled by the PLC program. When the CPU stops or loses communication, the outputs will go to whatever value the CPU last wrote—or to zero if the CPU halts without updating. In critical applications, program fail-safe logic in the CPU to set outputs to safe values on fault detection. The module just follows commands; it doesn’t decide. Q: What’s the maximum cable distance from to field device? A: The HITACHI LYT000A outputs 4-20 mA, so cable length is limited by voltage drop and noise pickup. With 600 ohm maximum load and 24V supply, practical limit is about 500-1000 feet using 18 AWG twisted pair. Beyond that, voltage drop reduces the voltage available to the field device. Use this formula: V_drop = I × R_cable × 2 (round trip). If voltage at device drops below its minimum operating voltage, it won’t work. For long runs, use larger wire or consider remote I/O. The doesn’t care about distance; Ohm’s law does. 77-964-2300 plc 6SE7090-0XX85-1DA0 PLC 6SE7038-6GL84-1JA1 PLC 6SE7041-2WL84-1JC0 PLC 6SE7038-6GL84-1BG2 PLC AKD-B00606-NAAN-0000 PLC 6DD1683-0BC5 PLC Email: [email protected] Phone: 86 15340683922 Sales:Wu Jiedong Our products are guaranteed for 1 year, with new and original production stopped and imported spare parts. All prices listed on the official website are subject to confirmation by contact: Wu Jiedong (manager). Our product: brand new original packaging Our warranty: All new or repaired parts have a 12 month warranty period beginning Our payment: 100% telegraphic transfer of inventory items before shipment, conditions can be proposed! If you have any downtime spare parts that you cannot find, please feel free to call or use email to contact me. If there are issues that the product cannot solve, please contact me. Product prices can be negotiated. Please do not consider contacting me!