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Technical data
6.2 System behavior
TM15 / TM17 High Feature Operating Manual
80
Commissioning Manual, 05/2009
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Figure 6-7
System behavior with cyclic measurement (call TO Measuring Input and user program in
the IPO cycle clock)
Note
If no edges are measured in a clock cycle, the TM17 High Feature can measure up to 4
edges in the following clock cycle, whereby the 3rd and, if necessary, 4th edges are buffered
(buffer of up to 2 edges).
In the following cycle clock, the buffered edges are transferred first even if new edges were
recorded; these new edges are buffered again.
Table 6- 5
Minimum time between two edges (cyclic measuring)
Edge selection
Minimum distance
Explanation
Rising edge
Falling edge
10 µs with filter setting of 1 µs
500 µs with filter setting of
125 µs
however, a maximum of 2
edges per task cycle of the scan
routine
Both edges
> 1 µs with filter setting of 1 µs
> 125 µs with filter setting of
125 µs
however, a maximum of 2
edges per task cycle of the scan
routine
Note
The parameter assignment screen for the Measuring Input technology object contains two
fields for edge selection:
- Edge selection for (single) measurement
- Edge selection for cyclic measurement