Kinco MK043E-20DT - PWM Operations

Kinco-MK
User Manual
49
3.2.4.2.4 PWM Operations
Following takes PWM0 as an example to introduce how to configure and operate the
PTO/PWM generator in the user program.
There are two procedures for using PWM: Configure related control registers and initialize
PTO. Execute PLS instruction.
Use SM0.1 (the first scan memory bit) to call a subroutine that contains the initialization
instructions. Since SM0.1 is used, the subroutine shall be executed only once, and this reduces
CPU scan time and provides a better program structure.
 Execute PWM
1) Set control byte SMB67 according to the desired operation.
For example, SMB67 = B#16#D3 indicates:
 Enable the PTO/PWM function
 Select PWM operation
 Select 1μs as the time base
 Allow updating the pulse width value and cycle time value
2) Set SMW68 according to desired cycle time.
3) Set SMW70 according to desired pulse width.
4) Execute the PLS instruction to configure PWM0 and start it.
 Changing the Pulse Width for the PWM Output
The following steps describes how to change PWM output pulse width.
1) Set control byte SMB67 according to the desired operation.
For example, SMB67 = B#16#D2 indicates:
 Enable the PTO/PWM function
 Select PWM operation
 Select 1μs as the time base
 Allow updating the pulse width value and cycle time value
2) Set SMW70 according to desired pulse width.
3) Execute the PLS instruction to configure PWM0 and start it