Siemens SIMATIC ET 200S - Parameters for digital electronic modules; Parameters for digital input modules

1PosUniversal/Digital
7.6 Functions of the 1PosU
ET 200S Positioning
322 Operating Instructions, 05/2007, A5E00124871-04
Principle
What You Do Response of the 1PosU
Provide the control interface with data depending on the
MODE.
Check the POS_ACK feedback bit is at 0
Switch the START control bit from 0 to 1 The 1PosU sets the feedback bits POS_ACK = 1 and
POS_DONE = 0.
You can tell by this that the start has been detected by
1PosU and when POS_ERR = 0, the MODE is executed.
The MODE is not executed when POS_ERR = 1.
Switch the START control bit from 1 to 0 The 1PosU sets the feedback bit POS_ACK = 0
In the case of stopping, the reference point run, absolute
and relative positioning, the 1PosU sets the feedback bit
POS_DONE = 1 when the MODE is terminated without
errors.
When POS_ERR = 1 the MODE is terminated with an error.
Only when POS_ACK=0 can you start a new MODE.
If you start when a MODE is running, the 1PosU takes on the new motion and executes a change of direction, if
necessary.
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Figure 7-5 Control and Feedback Signals with MODEs