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 |
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 30.5.9.4 Abnormal Status of Normal Pulse Output - Normal Pulse Output (LT Series)