31.5.6.6 Prestrobe
(Memorize Value) - High Speed Counter (Single-phase Settings, LT
Series)
Prestrobe is a feature that memorizes the current counter value.
Use the external input or the request flag to memorize the
value.
Turn ON the prestrobe request flag under the CH counter input
control request in the system variable (#L_ExIOCntInCtrl) to obtain
the counter value in the system variable (#L_HSC*_PSV). The
Operation bit will differ depending on the CH to which you allocate
the high-speed counter.
Summary
The setup procedure for the prestrobe is summarized below.
-
Store the value with the external input or the
request flag.
-
If you use the external input to store, acknowledge
the value in [Show Counter External Input Completed].
If you use the request flag to store, acknowledge the value in
[Special I/O State].
-
The [Request Special I/O Parameter Change]
and [Special I/O Parameter Change Completed] operations reflect all
the CH parameters you change.
-
Right after transferring, operations use
parameter values set up in GP-Pro EX. Any restarts, which include
going off-line, reset, and turning power OFF, use stored system
variables as parameters.
When the signal of the prestrobe input terminal that is
specified in [I/O driver] turns ON, the current count value is
stored in the system variable (#L_HSC*_PSV).
Signal of the prestrobe input terminal specified in [I/O Driver
Settings] turns on, and you can check whether storage is completed.
The setup procedure is shown below.
How to acknowledge the storage
completion
-
Use the system variable (#L_ExIOCntInExtCtrl).
#L_ExIOCntInExtCtrl
-
Regarding the details of the variable allocated in
[Counter External Input Completed], the watch bit differs,
depending on the CH on which you allocate the high-speed counter,
as shown below.
a: CH1 prestrobe complete
b: CH2 prestrobe complete
c: CH3 prestrobe complete
d: CH4 prestrobe complete
-
Regarding the details of the variable allocated in
[Acknowledge Counter External Input Completed], the operation bit
differs, depending on the CH on which you allocate the high-speed
counter, as shown below.
a: CH1 prestrobe completion acknowledged
b: CH2 prestrobe completion acknowledged
c: CH3 prestrobe completion acknowledged
d: CH4 prestrobe completion acknowledged
-
The figure below shows a timing chart for [Show
Counter External Input Completed] and [Acknowledge Counter External
Input Completed].
1) When the external input turns ON, the current count value is
stored in the system variable (#L_HSC*_PSV).
2) Once the value is stored, the completion flag of the counter
external input turns ON.
3) Acknowledge that the completion flag of the counter external
input is ON and turn ON the completion acknowledgment flag of the
counter external input.
4) When the acknowledgment flag of the counter external input is
recognized as ON, the completion flag of the counter external input
turns OFF.
-
[B] Request flag trigger
Turn ON the prestrobe request flag under the CH counter input
control request in the system variable (#L_ExIOCntInCtrl) to
memorize the current counter value.
The prestrobe completed flag under the CH counter input control
response in the system variable (#L_ExIOCntInCtrl) turns ON when
saving of the current counter value is completed. The Operation bit
and Monitor bit differ depending on the CH to which you allocate
the high-speed counter.
How to acknowledge the storage
completion
-
Use the system variable (#L_ExIOCntInCtrl).
#L_ExIOCntInCtrl
-
For variables allocated in [Counter input control
request], the operation bit will differ depending on the CH to
which you allocate the high-speed counter, as shown below.
Turn on the 3rd bit of the CH to store the current count value.
-
For variables allocated in [Counter Input Control
Response], the watch bit differs depending on the CH to which you
allocate the high-speed counter, as shown below.
If the 3rd bit of the CH is 1, the value has been stored. If it is
0, the value has not been stored.
1) Turn ON the request flag for the counter input control to store
the value.
2) Once the value is stored, the Storage complete flag turns
ON.
3) Acknowledge that the Storage complete flag is ON and turn the
store flag OFF.
4) When the store flag is recognized as OFF, the Storage complete
flag turns OFF.
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