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5 I/O Refreshing
NX-series Digital I/O Unit User’s Manual (W521)
5-
2 I/O Refres
hing
Meth
od
s
5
5-
2-8 Inp
ut Refre
shing with Input
Changed T
ime
With this I/O refreshing method, the Input Units record the DC times when the inputs changed. The DC
times are asynchronous to the NX bus refresh cycles.
The EtherCAT Coupler Unit cyclically reads both the input values and the DC times when the inputs
changed on the NX bus refresh cycles.
In the descriptions below, the DC time when the input changed is called the input changed time.
You can use the Input Units that support input refreshing with input changed time with the Output Units
that support output refreshing with specified time stamp to control an output at a fixed interval after a
sensor input changes.
• This method is used when you connect the NX Units that support input refreshing with input changed
time to the EtherCAT Coupler Unit, that is connected to the built-in EtherCAT port on the NJ-series
CPU Unit.
• The NX Units that support input refreshing with input changed time record the DC times when an
input changes for each input bit. The DC times that the Units record are the DC times for which the
status changes of the input terminals passed the ON/OFF response time and reached the internal cir-
cuits.
• The EtherCAT Coupler Unit reads the input values and the input changed times from the NX Units at
I/O refreshing. The input values that the EtherCAT Coupler Unit read are not the values at the point
when the input change times were recorded, but the values at I/O refreshing.
• All Digital Input Units and Analog Input Units that operate with synchronous input refreshing and input
refreshing with input changed times in the Slave Terminal read their inputs at the same time at a fixed
interval based on Sync0. (Refer to (a) in the figure below.)
• The EtherCAT Coupler Unit latches the input values on the input read timing and then reads them
during the next I/O refresh. (Refer to (b) in the figure below.)
• The interval of I/O refreshing varies with the processing conditions of the EtherCAT Coupler Unit or
the EtherCAT master. (Refer to (c) in the figure below.) The timing to read inputs will be at a fixed
interval. (Refer to (d) in the figure below.)
• Sync0, the timing of reading inputs, and the maximum NX bus I/O refresh cycle for multiple Slave
Terminals are automatically calculated by the Sysmac Studio according to the input refresh cycles of
the NX Units in the Slave Terminals when the Slave Terminals are configured and set up.
5-2-8
Input Refreshing with Input Changed Time
Description of Operation
Summary of Contents for NX-IA3117
Page 34: ...Sections in this Manual 32 NX series Digital I O Unit User s Manual W521...
Page 52: ...1 Features and System Configuration 1 18 NX series Digital I O Unit User s Manual W521...
Page 56: ...2 Specifications 2 4 NX series Digital I O Unit User s Manual W521...
Page 152: ...5 I O Refreshing 5 36 NX series Digital I O Unit User s Manual W521...
Page 204: ...8 Digital Mixed I O Units 8 8 NX series Digital I O Unit User s Manual W521...
Page 224: ...9 Troubleshooting 9 20 NX series Digital I O Unit User s Manual W521...
Page 230: ...10 Inspection and Maintenance 10 6 NX series Digital I O Unit User s Manual W521...
Page 337: ...I 1 I NX series Digital I O Unit User s Manual W521 Index...
Page 340: ...I 4 NX series Digital I O Unit User s Manual W521 Index...
