31.5.6.4 Clear Current
Counter Value - High Speed Counter (Single-phase Settings, LT
Series)
Use this function to clear the current counter value.
Furthermore, you can acknowledge that the current value is cleared.
You can use the clearing feature is available whether the counter
is ON or OFF.
To clear the current counter value with 0, turn ON the clear
flag under the CH counter input control request in the system
variable (#L_ExIOCntInCtrl). The Operation bit will differ
depending on the CH to which you allocate the high-speed
counter.
#L_ExIOCntInCtrl
Counter input control request
Turn ON the start bit (bit 0) of each CH to clear the counter
value.
For variables allocated in [Counter Input Control Response], the
watch bit differs depending on which CH you allocate the high-speed
counter to , as shown below.
If the start bit of the CH (0 bit) is 1, clear is complete. If
it is 0, clear is incomplete.
The following figure shows the flag timing chart for clearing
current counter value and completion.
1) Turn on the request flag for the counter
value clear to clear the current counter value.
2) Once the current counter value is cleared, the completion flag
of the count value clear turns ON.
3) Acknowledge that the completion flag of the counter value clear
is ON and turn OFF the request flag for the counter value
clear.
4) When the request flag for the counter value clear is recognized
as OFF, the completion flag of the counter value clear turns
OFF.
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