Omron NX-AD series - Page 109

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5 I/O Refreshing
NX-series Analog I/O Units User’s Manual for Analog Input Units and Analog Output Units (W522)
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
Analog Input
Unit A
Analog 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