Mitsubishi Electric MELSEC iQ-R Series User Manual page 102

External power supply OFF during synchronization
When the external power supply is turned off while the inter-module synchronization function is operating, 0V/0mA is output in
analog from all the channels. After the external power supply is turned on, and the next synchronous interrupt program is
executed after 'External power supply READY flag' (X7) is turned on, analog output is restarted.
Inter-module
synchronization cycle
External power supply
'External power supply
READY flag' (X7)
CPU module operating
status
'CH1 D/A conversion enable/
disable setting' (Un\G500)
'CH1 Output enable/disable
flag' (Y1)
Inter-module synchronous
interrupt program
'CH1 Synchronization digital
value' (Un\G9500)
Analog output value in CH1
'Synchronization status
monitor' (Un\G9600)
Inter-module synchronous interrupt program (I44)
(1) 0V/0mA is output in analog since the external power supply is turned off.
(2) The next synchronous interrupt program is executed after 'External power supply READY flag' (X7) is turned on, analog output is restarted.
*1 The inter-module synchronous interrupt program (I44) is executed even while 'External power supply READY flag' (X7) is off. To avoid
any unnecessary change of 'CH1 Synchronization digital value' (Un\G9500) while the inter-module synchronous interrupt program (I44)
is executed, set 'External power supply READY flag' (X7) to the interlock condition within the program.
*2 Note that after the next inter-module synchronous interrupt program (I44) is executed after 'External power supply READY flag' (X7) is
turned on, the analog output is restarted according to D/A conversion enable/disable and output enable/disable.
Monitor
When the inter-module synchronization function is used, the inter-module synchronization status can be monitored.
For details, refer to the following.
Page 186 Synchronization status monitor
1 FUNCTIONS
100
1.15 Inter-Module Synchronization Function
Inter-module
synchronization cycle
ON
ON
OFF
1A
Offset value
(1)
Inter-module synchronization target
(synchronization stopped) (1)
Inter-module synchronization
target (during synchronization) (2)
ON
OFF
200ms
OFF
*1
2A
0V/0mA
ON
RUN
D/A conversion enable (0)
ON
3A
Analog output
value of 3A
(2)
Inter-module synchronization target
(during synchronization) (2)
4A
Analog output
value of 4A