Hitachi PLCs Troubleshooting & Procedures

Step-by-step procedures

• Hitachi EH-150 — ERR LED & Clearing Errors — On a Hitachi EH-150 (HIDIC) PLC the ERR LED won't go out until you actually fix the cause — pressing the clearance switch alone does nothing. Learn how error clearing works, why the CPU's special internal outputs hold the detail, and how to handle a module ERR.