Station Status At Error Occurrence; Status Of The Master Station, Standby Master Station (When The Master Station Is Operating) And Remote I/O Station At Error Occurrence - Mitsubishi MELSEC Q Series User Manual

5 DATA LINK PROCESSING TIME

5.5 Station Status at Error Occurrence

5.5.1 Status of the master station, standby master station (when the master station is
operating) and remote I/O station at error occurrence
Table 5.1 The status of the master station, standby master station
(when the master station is operating) and remote I/O station at error occurrence
Data link status
When data link is stopped due to an error generated
by the master station PLC CPU (data link continue)
When data link is stopped due to an error generated
by the local station PLC CPU (data link continue)
The GX Developer
When data link for
data link faulty
the entire system is
station is set (master
stopped
station setting)
When a
The GX Developer
communication error
data link faulty
(power off, etc.)
station is set (master
occurs in a remote
station setting)
I/O station
When a
The GX Developer
communication error
data link faulty
(power off, etc.)
station is set (master
occurs in a remote
station setting)
device station
When a
The GX Developer
communication error
data link faulty
(power off, etc.)
station is set (master
occurs in a local
station setting)
station
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This section explains the status of each station at error occurrence.
Table 5.1 lists the operation of the master station, standby master station (when the
master station is operating) and remote I/O station upon the occurrence of an error.
Remote input (RX)
Continue
2
Clear Clear
Hold Hold
Clears the receive area
from the remote I/O
Clear
station having a
communication error
Retains the receive
area from the remote
Hold
I/O station with a
communication error
Clears the receive
area from the remote
Clear
device station with a
communication error
Retains the receive
area from the remote
Hold
device station with a
communication error.
Clears the receive
area from the local
Clear
station with a
communication error
Retains the receive
area from the local
Hold
station with a
communication error
1: If parameter setting has been made using the dedicated instructions, the data is
held. If parameter setting has been made using GX Developer, the data is cleared
when the RY refresh device is set to Y, the data is cleared or held when the RY
refresh device is set to other than Y. (See Section 4.3.5.)
2: When the RY refresh device is set to "Y" for the local station that has stopped,
only the receive area is cleared from the stopped local station ; the receive area is
retained or cleared when the RY refresh device is set to other than Y. (See
Section 4.3.5.) Operation continues for the receive areas from other stations.
Master station, standby master station
(when the master station is operating)
Remote output Remote
(RY) register (RWw)
1
Continue
Continue Continue
Undefined Undefined
Continues
operation of
Continue
areas other than
the remote I/O
station
Continue Continue
Continue Continue
MELSEC-Q
Remote I/O station
Remote
Input
register (RWr)
Hold Continue
Continue Continue
By external
Hold
signals
Continues
operation of
By external
areas other than
signals
the remote I/O
station
Retains the Continue
receive area (Not affected by
from the remote the
device station communication
with a status of the
communication remote device
error station)
Retains the Continue
receive area (Not affected by
from the local the
station with a communication
communication status of the
error local station)
Output
1
Continue
All points OFF
All points OFF
Continue
(Not affected by
the
communication
status of the
remote device
station)
Continue
(Not affected by
the
communication
status of the
local station)
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