Corrected from:
Library: SM3_Basic (no correction planned)
Response of the new version:
(no correction planned)
What happens?
Cam slave executes a setpoint jump and rotates backwards.
When does this behaviour occur?
If a value unequal 1 is assigned to the input SlaveScaling of the function block MC_CamIn from the SM3_Basic library, the assignment of the master position to the slave position is no longer clear. When the FB MC_CamIn is restarted, the slave position from the first period is used. This leads to a setpoint jump.
Which products are concerned?
Library: SM3_Basic
Short-term measures:
Proceed as follows to avoid the function restriction:
Trigger on EndOfProfile. If an event occurs, save the current slave position.
Assign the saved slave position to the input SlaveOffset of the function block MC_CamIn.
Assign the input StartMode of the FB MC_CamIn to the "absolute" mode.
Activate the input Execute of the FB MC_CamIn to accept the slave offset.
Evaluation/recommendations:
In cam applications, the use of the function block MC_CamIn may lead to a setpoint jump if the input SlaveScaling of the FB is unequal 1. A workaround for this function restriction is described above in the section 'Short-term measures'.
