Siemens SIMATIC ET 200S Operating Instructions Manual page 31

The diagrams below indicate how the interrupting and canceling gate functions work:
Figure 2-7
Figure 2-8
Gate Control by Means of the SW Gate Only
When the gate is opened, one of the following occurs, depending on the parameter
assignment:
● Counting continues from the current count status, or
● Counting starts from the load value
If the SW gate is opened in isochronous mode in bus cycle "n" by setting the SW_GATE
control bit, counting starts at time T
delivers the current count value from time T
(http://support.automation.siemens.com/WW/view/en/15218045) function manual)
Gate Control by Means of the SW Gate and HW Gate
If the SW gate opens when the HW gate is already open, counting continues starting from
the current count status.
When the HW gate is opened, one of the following occurs, depending on the parameter
assignment:
● Counting continues from the current count status, or
● Counting starts from the load value
If the SW gate is opened in isochronous mode in bus cycle "n" by setting the SW_GATE
control bit, counting starts at time T
time. If the HW gate opens between T
HW gate is open. In both cases, the 1Count24V delivers the current count value in cycle
"n+1" starting from time T
Technological Functions
Operating Instructions, 06/2010, A5E00124867-07
Count Continuously, Up, Interrupting Gate Function
Count Continuously, Down, Canceling Gate Function
.
i
in cycle "n+1". In the same cycle "n+1", the 1Count24V
o
. (See Isochronous Mode
i
in cycle "n+1" if the HW gate is already open at this
o
and T in cycle "n+1", counting only starts once the
o i
1Count24V
2.6 Count Modes
31