Siemens SIMATIC ET 200S Operating Instructions Manual page 136

1Count5V/500kHz
3.6 Count Modes
The diagrams below indicate how the interrupting and canceling gate functions work:
Figure 3-7
Figure 3-8
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, or
• Counting starts from the load value
If the SW gate is opened in isochrone 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
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.
When the HW gate is opened, one of the following occurs, depending on the parameter
assignment:
• Counting continues from the current count, or
• Counting starts from the load value
If the SW gate is opened in isochrone mode in bus cycle "n" by setting the SW_GATE control
bit, counting starts at time T
HW gate opens between T
open. In both cases, the 1Count24V/100kHz delivers the current count value in cycle "n+1"
starting from time T
136
Count Continuously, Up, Interrupting Gate Function
Count Continuously, Down, Canceling Gate Function
in cycle "n+1". In the same cycle "n+1", the 1Count24V/100kHz
o
in cycle "n+1" if the HW gate is already open at this time. If the
o
and T in cycle "n+1", counting only starts once the HW gate is
o i
.
i
Isochronous Mode
. (see
i
Operating Instructions, 02/2007, A5E00124867-05
Manual).
Technological Functions