31.5.13.2 Pulse Output Usage Restrictions
For pulse outputs, when combining the number of CH and
high-speed counters used, there is a limit to the maximum output
frequency.
While the pulse output maximum frequency is 65000 Hz, when
combined with how many CH and high-speed counters are used as
illustrated in the following table, there is a limit to the output
frequency setting.
For example, when using 3 pulse output CH and 1 high-speed
counter CH, the maximum output frequency per CH is 27027 Hz.
Pulse Output 1CH Maximum Frequency
|
|
Pulse output
|
|
1 CH
|
2 CH
|
3 CH
|
4 CH
|
|
High Speed Counter
(1 phase, 2 phase)
|
Do Not Use
|
65000 Hz
|
45454 Hz
|
30303 Hz
|
22727 Hz
|
|
1 CH
|
65000 Hz
|
38461 Hz
|
27027(Hz)
|
—
|
|
2 CH
|
52631(Hz)
|
33333(Hz)
|
—
|
—
|
|
3 CH
|
43478(Hz)
|
—
|
—
|
—
|
|
4 CH
|
—
|
—
|
—
|
—
|
*"-" indicates cannot use.
* 2-phase counter has a maximum 2 CH. In the table, 3 CH is for
single phase counters.
Verification of these limits occur when the LT starts up and
when parameters change.
When an error arises, error information is stored in the system
variable (#L_ExIOSpParmErr). For details, see 31.5.9.4 Abnormal Status
of Normal Pulse Output - Normal Pulse Output (LT Series)
|
