Mitsubishi Electric MELSEC iQ-R Series Reference Manual page 24

Flexible high-speed I/O control module
The flexible high-speed I/O control module can synchronize external output timings by using the inter-module synchronization
signal as a trigger. With this, command timings to external devices that are connected to more than one flexible high-speed I/
O control module can be synchronized with each other, enabling simultaneous control of outputs more than the number that
one module can use.
In addition, the count value and the High/Low status of external input signal at the latest synchronization cycle can be referred
to in the inter-module synchronous interrupt program because a count value and an I/O status are refreshed to the CPU
module by using the inter-module synchronization signal as a trigger.
The inter-module synchronization signal also can be output from an external output terminal. Using this output signal expands
the targets of synchronization control to external devices that do not have the inter-module synchronization function.
Flexible high-speed I/O control module 1
Synchronization latch count value
General command (Y10 to Y1F), User Address
Flexible high-speed I/O control module 2
Synchronization latch count value
General command (Y10 to Y1F), User Address
For details on the inter-module synchronization function in the flexible high-speed I/O control module, refer to
the following.
Manual for each flexible high-speed I/O control module
5 FUNCTION
22
5.1 Fixed Cycle Synchronization Function
Inter-module
synchronization cycle
Inter-module synchronous
interrupt program
CPU module
Input (2) Operation
refresh processing
(1) Reading data from
the CPU module
Synchronization latch
count value 1, external
input signal status
Count value
Latch count value 1
Status 0
Count value
Latch count value 1
Status 0
Inter-module synchronous
interrupt program
Normal program
Output Input
refresh refresh
(3) Reflecting data (1) Reading data from
to the module
Synchronization latch
General command,
count value 2, external
User Address
input signal status
Latch count value 2
Status 1
Latch count value 2
Status 1
Inter-module
synchronization cycle
Normal program
(2) Operation Output
processing refresh
(3) Reflecting data
the CPU module to the module
General command,
User Address
Status 2
Status 2