Specifications

SIMATIC Instructions
9-58
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Table 9-18 PTO/PWM Control Byte Reference
Control
Result of executing the PLS instruction
Control
Register
(Hex
Value)
Enable
Select
Mode
PTO
Segment
Operation
PWM Update
Method
Time Base
Pulse
Count
Pulse
Width
Cycle
Time
16#81 Yes PTO Single 1 µs/cycle Load
16#84 Yes PTO Single 1 µs/cycle Load
16#85 Yes PTO Single 1 µs/cycle Load Load
16#89 Yes PTO Single 1 ms/cycle Load
16#8C Yes PTO Single 1 ms/cycle Load
16#8D Yes PTO Single 1 ms/cycle Load Load
16#A0 Yes PTO Multiple 1 µs/cycle
16#A8 Yes PTO Multiple 1 ms/cycle
16#D1 Yes PWM Synchronous 1 µs/cycle Load
16#D2 Yes PWM Synchronous 1 µs/cycle Load
16#D3 Yes PWM Synchronous 1 µs/cycle Load Load
16#D9 Yes PWM Synchronous 1 ms/cycle Load
16#DA Yes PWM Synchronous 1 ms/cycle Load
16#DB Yes PWM Synchronous 1 ms/cycle Load Load
PTO/PWM Initialization and Operation Sequences
Descriptions of the initialization and operation sequences follow. They can help you
better understand the operation of PTO and PWM functions. The pulse output
Q0.0 is used throughout these sequence descriptions. The initialization
descriptions assume that the S7-200 has just been placed in RUN mode, and for
that reason the first scan memory bit is true. If this is not the case, or if the
PTO/PWM function must be re-initialized, you can call the initialization routine
using a condition other than the first scan memory bit.