Siemens simatic et 200s Operating Instructions Manual page 38

1STEP 5V/204kHz
2.6 Functions of the 1STEP 5V/204kHz
Limit Switches and External STOP
By assigning parameters, you can choose to wire normally open or normally closed contacts
for the external STOP and the limit switches.
● Normally closed contact means: The external STOP is tripped by a 0 signal. When the
● Normally open contact means: The external STOP is tripped by a 1 signal. When the limit
Note
If it stops during the acceleration phase, before it starts braking the electronic module
1STEP 5V/204kHz still sends pulses for 50 ms at the frequency already reached. This
avoids abrupt changes in frequency, which can lead to step losses.
If it stops during the acceleration phase, the 1STEP 5V/204kHz electronic module will
emit more pulses than expected in the following circumstances:
– If 33% to 37.5% of the total number of pulses have already been emitted
– If the velocity reached at stopping was so high that as many pulses were emitted in 50
ms as during the acceleration phase
Since just as many pulses are emitted during the delay phase as during the acceleration
phase, the 1STEP 5V/204kHz emits a maximum 112.5% of the defined pulses. The
residual distance in this case has a negative sign, and the DIS_NEG feedback bit is set.
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limit switches are reached, delete the associated control bit.
switches are reached, set the associated control bit.
Operating Instructions, 05/2007, A5E00124871-04
ET 200S Positioning