Siemens SIMOTION TM15, Руководство по вводу в эксплуатацию

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Technical data
6.2 System behavior
TM15 / TM17 High Feature Operating Manual
78
Commissioning Manual, 05/2009
6.2.2 System timing for single measurement
The system behavior for a single measurement is shown in the figure below:
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Figure 6-6 System behavior for single measurement (call Measuring Input technology object and
user program in the IPO cycle clock)
If a measuring input event occurs in the shaded area in IPO cycle clock #1, then the actual
event time T
event
is transferred at the beginning of the following IPO cycle clock. In the
Measuring Input technology object (TO), T
event
is converted to a position value (POS) that is
available to the user program in IPO cycle clock #3.
The time-related behavior for single measurement depends on two parameters:
●
The ratio between the IPO cycle time and the cycle time of the position control cycle clock
(i.e. ratio of IPO to servo).
● The time level to which the Measuring Input technology object is assigned.
The following table shows the minimum sampling cycle.
The minimum sampling cycle defines the time between two measurements (e.g. the time
between detection of two print marks).
Table 6- 4 Minimum sampling cycle – Single measurement
TO executed in IPO cycle clock TO executed in position control cycle clock
5 position control cycle 2 IPO cycle
clocks
6 position control cycle 1 IPO cycle clock
Each sampling cycle is started by a measurement command from the technology object. The
TM15 and TM17 High Feature Terminal Modules are capable of sampling a maximum of two
edges within one sampling cycle.