Trial Run of Delta PLC Before Starting the Trial Run of Delta PLC anyone should check following things Power Indication of Delta PLC 1. At the front of the MPU or the expansion unit, there is a “POWER” LED. When the MPU is powered ON, the LED (in green) will be ON. If the indicator is not on when the MPU is powered up, it means there is problem that DC power supplies to PLC. Thus, it is important to check whether the wiring of +24V and 0V are properly conducted. If ERROR LED is blinking swiftly, it means +24VDC does not supply enough power to delta PLC. 2. If the other indicator, “L. V”, that locates at the front of the extension unit is on, it means that the input power voltage to the extension unit is insufficient, and the output from the extension unit should be prohibited. Preparation 1. Make sure that the power wiring and the I/O wiring are both conducted properly before the power ON. Please ensure NOT supply AC110V or AC220V to the I/O terminals, or the wiring might be short cir...