Error Communication - Mitsubishi Electric NF250-SEV Programming Manual

5.5 Error communication

When an error occurs in the MDU, the status changes to the error communication. The chart below shows the procedure
to cancel the error.
Write values to each device (bit device and word device set for each refresh device in the automatic refresh parameter) of
the corresponding sequencer CPU or read values from each device so that each signal changes as shown in the chart
below.
Error status flag
(Remote input (RX (n + 1) A))
Error reset request flag
(Remote output (RY (n + 1) A))
Remote register (RWr)
Remote ready
(Remote input (RX (n + 1) B))
[1] When an error occurs in the MDU, the error flag is turned on and the remote ready is turned off.
[2] When the error flag is turned on, read the error code from the remote register (RWr). Remove the cause for the
error by reading the error code and turn on the error reset request flag when restarting the communication with
the MDU.
[3] When the error reset request flag is turned on, the error flag is turned off.
[4] After the error flag is turned off, turn off the error reset request flag.
[5] After the error reset request flag is turned off, the remote ready is turned on and the normal communication is
restarted.
Note：For the error code, see "7. Error occurrence" to be mentioned later.
Error
occurrence
[1]
[2]
[2]
Error code
[1]
27
[3]
[4]
[5]
ON(1)
OFF(0)
ON(1)
OFF(0)
ON(1)
OFF(0)
KGA120334-C