Mitsubishi Electric QJ71PB93D User Manual page 57

4 FUNCTIONS
1) Before receiving FREEZE service
Class 1 master
station
Input data
Output data
2) After receiving FREEZE service
FREEZE service
Class 1 master
station
Input data
Output data
3) After receiving UNFREEZE service
UNFREEZE service
Class 1 master
station
Input data
Output data
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(b) When receiving FREEZE and UNFREEZE services
Input/Output
Image memory
Input data
Output data
Input/Output
Image memory
Input data
Output data
Input/Output
Image memory
Input data
Output data
(2) Group selection
There are a total of 8 groups from 1 to 8.
The QJ71PB93D is allowed to belong to any of the 8 groups. (Specify the group
using the configuration tool of the master station.)
QJ71PB93D
Buffer
memory
Input
send
area
Output
receive
area
QJ71PB93D
Buffer
memory
Upon reception of the FREEZE service, the
FREEZE mode is started and refresh from the
Input
input send area to the input data area is stopped.
send
area
During the FREEZE mode, the FREEZE LED of
the QJ71PB93D is on.
Output
receive
When the FREEZE service is received during the
area
FREEZE mode, refresh to the input sending area
is performed only once.
Even during the FREEZE mode, refresh from the
output data area to the output receive area is
executed continuously.
QJ71PB93D
Buffer
memory
Upon reception of the UNFREEZE service, the
FREEZE mode is terminated and refresh from the
Input
input send area to the input data area is restarted.
send
area
When the UNFREEZE service is received and the
FREEZE mode is ended, the FREEZE LED of the
Output
QJ71PB93D turns off.
receive
area
MELSEC-Q
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