PWM output is a feature that outputs a pulse with a set output frequency when the set duty turns ON. A maximum of four channels can be set for PWM output, which can be individually set. By connecting SSR to PWM output terminal, analog control for heaters becomes possible. The main features of PWM output are shown in the following table.
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Summary of functions |
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Sets the output frequency |
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Sets the ON Duty |
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Parameter change |
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Checks abnormal status of the output frequency and ON Duty |
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Starts and stops the PWM output |
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Checks the status of start and stop PWM output |
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Checks the status of the output terminal |
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Summary
In GP-Pro EX, you can set up the initial value for each parameter. After the system is running, you can change parameters with system variables.
The procedure for setting the PWM output is summarized below.
Part of the settings can also be set up with logic program I/O driver instructions.
31.23 I/O Driver Instructions
Setting Up Initial Values
Refer to the setup procedures for GP-Pro EX
Changing After System is Running
Set the output frequency and the ON duty value.
Set the parameter under [Request Special I/O Parameter change].
Under [Special I/O Parameter Change Completed], acknowledge that the parameter has been changed.
Output the data with [Control Special I/O].
See "Special I/O state" for acknowledgment.
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.
For PWM Output, when changing the Output Frequency and ON duty values, because the timing for changes is random, there may be an instant when the Output frequency or ON duty values are unknown.