6 - 61
6 Incremental Encoder Input Units
NX-series Position Interface Units User’s Manual (W524)
6-9 Functions
6
6-9-8 Latching
Precautions for Correct Use
Restrictions in Continuous Mode
• When you perform latching with an external input, a latch cannot be detected for 1 ms after
the previous latch was detected, even when the latch input is enabled.
Restrictions on Latch Inputs, Resetting, and Counter Presetting
• Do not use a latch input that uses an external input at the same time as a reset (i.e., a
phase-Z reset, a reset with an external input, or an internal reset). If you do, the value of the
latch data is unpredictable.
• Also, do not use a counter preset at the same time as a latch input that uses an external
input. If you do, the value of the latch data is unpredictable.
• A delay of up to 250 μs will occur between when the latch input is received and when the
latch data is processed. The latch data and latch completed flags will turn ON the first time
input data is refreshed after processing is completed.
Clearing the External Latch Input Completed Flag
When the latch input is enabled and a trigger input occurs for an external input, the Latch Input 1
Completed or Latch
Input 2 Completed Flag turns ON. Change the Latch Input 1 Enable or Latch 2
Enable bit from 1 to 0 to reset the Latch
Input 1 Completed or Latch Input 2 Completed Flag.
Then, when the latch input is enabled and a trigger input occurs for an external input, the Latch
Input
1 Completed or Latch Input 2 Completed Flag will turn ON again.
Refer to Latch Status on page 6-38 for information on the Latch Input Completed Flag and Latch
Function on page 6-41 for information on the Latch Input Enable bit.
ON
OFF
External input
1 ms
Latch executed. Latching not
possible.
Latch executed.
To Next Page
Loading...
Need help?
General
