National Instruments Welding System 321645c-01 Manual De Usuario

Chapter 2

Function Reference — CTR_Simul_Op

National Instruments Corporation

2-109

NI-DAQ FRM for PC Compatibles

Note

It is not necessary to call

CTR_Simul_Op

with mode set to 1 before calling

CTR_Simul_Op

with mode set to 4. That is, it is permissible to start two or more

counters at different times and still latch their counts at the same time.

Using This Function

You can start multiple counters simultaneously for any combination of event counting, square
wave generation, or pulse generation. The following sequence is an example of using

CTR_Simul_Op

Specify the counters to use by putting their counter numbers into the ctrList array.

Call

CTR_Simul_Op

with mode = 1 to reserve these counters.

Set up the counters by calling

CTR_EvCount

CTR_Period

CTR_Square

, or

CTR_Pulse

for each reserved counter. Because these counters are reserved, they will not

start immediately by those calls.

Call

CTR_Simul_Op

with mode = 2 to start these counters.

Call

CTR_Simul_Op

with mode = 3 to stop these counters.

Call

CTR_Simul_Op

with mode = 0 to free counters for non-simultaneous operations.

You can stop counters from performing

CTR_EvCount

CTR_Period

CTR_Square

, or

CTR_Pulse

simultaneously, regardless of whether they were started by

CTR_Simul_Op

Trying to start unreserved counters simultaneously causes this function to return an error.

Call

CTR_Simul_Op

with mode = 0 to cancel the reserved status of counters specified in

ctrList.

Note

On the PC-TIO-10, the 10 counters are included on two counter/timer chips.
These counter/timer chips are programmed sequentially. Simultaneous
start-and-stop operations that specify counters from both chips experience a delay
between the counters on the first chip (counters 1 through 5) and those on the
second chip (counters 6 through 10). NI-DAQ returns a warning condition.