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6
LINK DATA SEND/RECEIVE PROCESSING AND
PROCESSING TIME
6.1 Link Data Send/Receive Processing
6.1.3 Link data handling in the case of a communication error
6 - 3
1
OVERVIEW
2
SYSTEM
CONFIGURATION
3
SPECIFICATIONS
4
FUNCTIONS
5
PREPARATORY
PROCEDURES BEFORE
OPERATION
6
LINK DATA SEND/
RECEIVE PROCESSING
AND PROCESSING TIME
7
PROGRAMMING
8
TROUBLESHOOTING
6.1.3 Link data handling in the case of a communication error
When a communication error occurs, link data are handled as follows. (The same for a
communication error of the station connected to the bypass switch.)
• The communication error station holds link data immediately before the
communication error.
• The normally operating station holds link data immediately before the
communication error, in the send range of the communication error station.
(1) When a master station has a communication error
Data communications with all stations are stopped.
(a) Master station (Communication error station)
1) M9210 turns ON, or "5" is stored in D9204.
2) Data immediately before the communication error are held in the areas, M9224
to M9239 and D9202 to D9242.
3) The master station holds the data that have been received from local stations
and that were present immediately before the communication error.
(b) Q series local station
1) M9250 and M9251 turn ON.
2) The station holds the data that have been received from other stations and that
were present immediately before the communication error.
(2) When a Q series local station has a communication error
Data communications are continued among normally operating stations.
Figure 6.3 When a Q series local station (L1) has a communication error
Master station
L1 station
M station
send range
L1 station
receive range
L2 station
receive range
M station
receive range
L1 station
send range
L2 station
receive range
M station
receive range
L1 station
receive range
L2 station
send range
B/W
Sending/receiving data
Holding data
Communication error station
L2 station