Finding The Cause Of An Error And Correcting The Error; Finding The Cause Of An Error - Panasonic MEWNET-F Technical Manual

9.1 Finding the Cause of an Error and Correcting the Error

This chapter explains the method for troubleshooting and checking error states when using the remote
I/O system [MEWNET-F].

9.1.1 Finding the Cause of an Error

Follow the procedure below to find the cause of an error and eliminate it.
1. Checking the LEDs
Check the "ALARM" and "COMM." (or COM.) LEDs on the master unit, slave unit and FP I/O terminal.
LED name Status
ALARM Lights:
Flashing
slowly
(1-s cycle)
COMM.
(COM.)
Goes out:
2. Determining what kind of error has occurred
When an error occurs, the self-diagnostic function will be activated and the type or source of the error
will be able to be checked.
They will be stored in teh special data registers DT9136(DT90136) and DT9137(DT90137).
3. Checking the communication path (for master 1 through master 4) on which an error has
occurred
You can check which communication path has produced an error with the special data registers
DT9136(DT90136) and DT9137(DT90137), and with the special internal relays R9058 to R905B.
4. Checking the slave station number of the slave station where an error occurs
You can check the slave station number in error with the special data registers DT9131(DT90131) and
DT9135(DT90135).
9-2
Contents
Error in the unit or board.
A communication error (such as
the disconnection of transmission
cable or the power off of slave
station) occurs on another station.
Transmission error (Error in
transmission cables or the
terminal station setting,
communication with a master unit
cannot be performed.)
Actions
Replace the unit/board with a
new one.
Check the transmission line
and location, and take a proper
step.
Check the error and take a
proper step.