Global Control Functions - Mitsubishi A1SJ71PB92D User Manual

4. FUNCTIONS
4.1.2

Global control functions

Global control contains the four functions of SYNC, UNSYNC, FREEZE, and UNFREEZE, which are
functions that are used to maintain/cancel slave I/O for which multicast communication is conducted at
the same time.
The slaves that execute the global control function are those located in one or more groups of the
eight groups. The group No. of the group containing the slaves is set by the configurator. In the
AJ71PB92D/A1SJ71PB92D the group can be arbitrary specified and the global control commands
transmitted using multicast communication. This makes is possible to select a slave and conduct
global control.
Group 1
The global control function is executed using X, Y, and FROM/TO instructions from the sequence
program.
(1) Service SYNC, UNSYNC
(Group 1) (Group 2)
Slave 1
Output image memory: Data is always refreshed using polling.
<During UNSYNC execution/default>The output image memory value is output unchanged
<During SYNC execution>The output image memory value is only output once during the
Service SYNC (issued in the same group)
Master
Master
(SYNC transmission to group 1)
(Group 1)
Slave 2 Slave 3
(normal condition)
SYNC service timing.
4-2
MELSEC-A
PROFIBUS-DP network
Group 5
Output data
SYNC
(Group 1)
Slave n