Siemens SIMATIC ET 200S Operating Instructions Manual page 58

1Count24V
2.7 Measurement Modes
Integration Time and Update Time in Isochronous Mode
If the integration time/update time lasts several T
measured value in the user program at the bit STS_CMP1 status bit (measurement
completed) of the feedback interface. This enables monitoring of the measuring operation or
a synchronization with the measuring operation. It takes 4 T
message to be acknowledged. The minimum integration time/update time in this case is
(4 x T
If the application can tolerate a jitter in the integration time/update time of T
measured value that remains constant for several cycles, you do not need to continually
evaluate status bit STS_CMP1. Integration times/update times of (1 x T
then possible.
Because isochronous operation was lost in the last T
integration time/update time is increased by one T
measured value.
Note
The value range limits for the integration time/update time must not be exceeded (see tables
for the individual measuring modes).
A violation of the value range limits will result in a parameter assignment error, and the
1Count24V will not go into isochronous mode.
Note
When you change the configuration from non-isochronous to isochronous mode and vice
versa, you must always adjust the integration time/update time parameter if you want to keep
the length of the integration time/update time.
58
).
DP
cycles, you can recognize the new
DP
cycles, however, for this
DP
DP
cycle of the integration time, the
DP
cycle. This does not corrupt the
DP
Operating Instructions, 06/2010, A5E00124867-07
and a
DP
) to (3 x T ) are
DP
Technological Functions