Operating The Interface With Full Acknowledgement Principle - Siemens SIMATIC S7-300 FM 350-1 Manual

Programming the FM 350-1
5.7 Programming FM 350-1 without FCs
5.7.5

Operating the interface with full acknowledgement principle

Complete Acknowledgement Principle
The complete acknowledgement principle is always used to control the FM 350-1 from the
user program:
Figure 5-4
The sequence is as follows:
1. If the feedback bit = 0, you can request processing via the user program by setting the
2. The FM 350-1 detects the request, acknowledges it by setting the feedback bit and starts
3. Once the FM 350-1 has set the feedback bit, you can reset the control bit.
4. At the end of processing, the FM 350-1 responds to the resetting of the control bit by
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Complete Acknowledgement Principle
control bit.
the processing.
resetting the feedback bit.
FM 350-1 Counter module
Manual, 05/2011, A5E03648639-01