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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 Refres
hing
Meth
od
s
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
1 2 3 4
Input 1
Input 2
AD conversion
time for all Units.
Synchronization timing
Constant
Constant
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.
1 2 3 4
Input 1
Input 2
Digital Input
Unit A
Digital Input
Unit B
Analog Input
Unit A
Analog Input
Unit B
Not constant.
1 2 3 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
Summary of Contents for NX-AD series
Page 289: ......
