Err Led Turns On On The Expansion Unit - Panasonic FP7 Series User Manual

terminal, there is probably an abnormality in the power supply or the input device.
4. Monitor the input status using the tool software FPWIN GR7.
If the input monitored is off, there is probably an abnormality with the unit's input
part.
Modify the program if the input monitored is on. If the input device is a two-wire
sensor, influence of leaked current is possible.
KEY POINTS
When the program is to be reviewed, check the following points.
•
1. Check if output specifications are rewritten (e.g. duplicated output use)
2. Check if the program flow has been changed due to an MCR instruction, JMP
instruction or other control instructions.
3. Check if the I/O map allocation agrees with the actual mount status.

6.2.7 ERR LED Turns ON on the Expansion Unit

 Condition
There is probably an error in the power supply system of the expansion block in which the
expansion slave unit with the ERROR LED lit is attached or another expansion block
connected to the subsequent stage, or an error in a unit in the expansion block.
 Solution
Clarify the situation in the following procedure.
PROCEDURE
1. Check if the power supplies to all the expansion blocks registered in the I/O
map are ON.
2. Check the wiring conditions of expansion cables and power supplies.
3. Check if the end unit is connected at the end of the expansion block.
4. Check if an error occurs in a unit in the expansion block.
If a unit error occurs, refer to the manual of each unit and find the cause of the
error.
5. Clear the self-diagnostic error of the CPU unit.
6. Turn on the power to the expansion units first, and then turn on the power
to the CPU unit.
6.2 What to Do If an Error Occurs
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