User`s manual

12-15
M-net (Master Station) Function
12
12-4-2 Error flag
[1] Error flag details
The error flags are relays that are turned ON when the M-net is not able to communicate normally.
When using the JW-32CUM1, the details of the error are displayed on the indicator lamps (CM-M section)
as error codes.
- Set the relay number for the error flag using the switches on the communication selection register
address is "15010" when the JW-32CUM1 is used as a master station.
- When an error flag is programmed as an input signal, communication errors can be monitored.
[EX]
- When the start relay (page 12-8) is turned ON after a connection sequence error or a communication
sequence error has occurred, the error flag will be turned OFF.
[2] Relationship between communication errors and switch settings
The method for handling communication errors varies with each switch (SW3-4) setting on the master
module (JW-32CUM1).
15010
Communication error
OFF ONSwitch setting
When an
error occurs
The M-net communication will stop. (Communication with all
stations stops.)
- The error flag turns ON.
- The error code is displayed and the error code is stored in
system memory.
Faulty stations are not restored automatically. (The following
procedures are required to restore a station.)
Communication only
continues with normal
stations.
Error display
Same as on the left.
Recovery pro-
cess for a
faulty station
1. When applying the power to the PC
- When the start relay is set to "always ON," first turn ON
the power to the slave station PCs, and then provide
power to the master station PC.
- After checking that all of the communication station PCs
are ON, turn ON the start relay.
2. Communication recovery process when a slave station
is faulty
After repairing and restarting the faulty station, turn the start
relay OFF and ON again. The communication process will
be restarted from the connection sequence.
3. If you must remove a faulty station
Turn ON the communication selection and turn the start re-
lay OFF and ON again to remove the registration of the faul-
ty slave station from the M net. The communication process
will be restarted from the connection sequence.
The faulty station will
recover automatically.
The master sta-
tion periodically
executes a com-
munication re-
covery process
to restore faulty
stations.