Pulse Enable - Siemens simatic et 200s Operating Instructions Manual

2.6.6

Pulse Enable

Functional Description
Pulse enable permits the output of pulses from the 1STEP 5V/204kHz to the power unit.
A run is not possible without pulse enable.
Activating Pulse Enable
You can activate pulse enable by one of the following methods:
● By means of the digital input DI 3
● By means of the control bit DRV_EN
You can tell that pulse enable has been activated by the following:
● The RDY LED on the 1STEP 5V/204kHz lights up, given correct parameter assignment
● The STS_DRV_EN feedback bit is set
Deleting the Pulse Enable
Deleting the pulse enable during a run terminates the run immediately because no more
pulses are emitted to the power unit. Without pulses, the stepping motor comes to a
standstill. The residual distance is then no longer valid. The synchronization of the axis by
means of the reference point is lost. The SYNC feedback bit and the RDY LED are deleted.
Deleting the pulse enable when the motor is at standstill deletes the SYNC feedback bit and
the RDY LED.
In these cases it is advisable to carry out a search for reference.
ET 200S Positioning
Operating Instructions, 05/2007, A5E00124871-04
(parameter assignment: digital input DI = external pulse enable) or
(parameter assignment: digital input DI = external STOP)
and pulse enable.
1STEP 5V/204kHz
2.6 Functions of the 1STEP 5V/204kHz
39