Omron NX-ID - Page 143

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5 I/O Refreshing
NX-series Digital I/O Unit User’s Manual (W521)
5-2 I/O Refreshing Methods
5
5-2-5 Synchronous Input Refreshing
Offset between
synchronization timing and
timing to read inputs
This time is automatically
calculated by the Sysmac
Studio.
(a) All Input Units that support synchronous
input refreshing read their inputs simultaneously.
I/O refreshing synchronization
The longest AD conversion time
is within one cycle.
Synchronization timing
Synchronization
timing
1234
Input 1 Input 2
AD conversion
time for all Units.
Synchronization timing
ConstantConstant
Constant Constant
(b) The CPU Unit reads the data that is
read by the Unit at I/O refreshing.
(c) Interval of I/O refreshing
is not constant.
1234
Input 1 Input 2
Digital Input
Unit A
Digital Input
Unit B
A
nalog Input
Unit A
A
nalog Input
Unit B
Not constant.
123
4
Input 1 Input 2
I/O refreshing
of the NX bus
(d) Interval of synchronization timing
is constant.
AD conversion starts
ON/OFF response
time
Input filter time
(e) Constant
(f) Set inputs
(f)(f)
ON/OFF response
time
Input filter time
AD conversion
time for all Units.
Input refreshing
Output refreshing