System Behavior With Cyclic Measurement - Siemens SIMOTION TM15 Commissioning Manual

The minimum pulse width depends on the specified edge selection:
Edge selection
Rising edge
Falling edge
Both edges
Both edges,
rising edge first
Both
edges,
falling edge first
Depending on filter selection.
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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
6.2.3

System behavior with cyclic measurement

Up to two edges can be measured in each execution cycle of the Measuring Input TO (IPO
interpolation cycle clock, IPO2 interpolation cycle clock or position control cycle clock).
The measured values must be read from the user program before they can be overwritten by
a new measurement.
Result:
● A maximum of two edges can be evaluated per IPO cycle clock if the scan routine of the
● A maximum of two edges can be evaluated per position control cycle clock if the scan
The servo-synchronous task is the lowest possible time level for a user program.
TM15 / TM17 High Feature Operating Manual
Commissioning Manual, 05/2009
Minimum distance
Minimum sampling cycle
(see "Minimum Sampling Cycle" table).
>1 µs/125 µs
>125 µs (TM15)
user program is in the IPO synchronous task.
routine of the user program is in the servo-synchronous task
(TM17)
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Technical data
6.2 System behavior
Explanation
Each new edge requires a new
measurement command.
Both edges are sampled within
one sampling cycle.
Minimum distance between first
measurement edge and previous
edge = 4 position control clock
cycles
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