Judge the Error through the Indicator at the Front Panel When error occurred for the DVP PLC, please check : POWER LED There is a “POWER” LED at the front of the MPU. When the MPU is powered On, the green LED light will be on. If the indicator is not on when the MPU is powered up and with the input power being normal, it is an indication that the PLC is out of order. Please have this machine replaced or have it repaired at a dealer near you. RUN LED Identify the status of the PLC. When the PLC is in operation, this light will be on, and users could thus useHPP or the ladder diagram to edit program and give commands to make the PLC “RUN” or “STOP”. ERROR LED 1. If illegitimate program is input to the MPU, or that the commands and devices of the program exceed the allowable range, the indicator will thus be blinking. In this case, the user should inquire about the errorcode from the special data register D1004 in the MPU and look it up in the Error Code Table. After the error is found ...