Cause : PLC download fail comes when PLC download failure due to momentary power loss during the downloading. After the power is ON again, the PLdF warning occurs. This warning comes when PLC download is forced to stop, so the written program is incomplete.

• Check if the program is correct and download the program again. If the fault does not exist, the warning automatically clears.
• Check if there is any error in the program and re-download the PLC program.