Configuration/programming
2.2 Configuring and programming TM1x modules
TM15 / TM17 High Feature Operating Manual
26
Commissioning Manual, 05/2009
Measurement modes
You can select the measurement mode from the dropdown menu in the "Mode" column.
Table 2- 4
"Mode" column: Description of symbols
Symbol
Measurement mode
Single measurement
Cyclic measurement
The main difference between the Single Measurement and Cyclic Measurement modes is
that with Single Measurement, a measurement job must be issued by the Measuring Input
technology object for each measurement.
The measurement job remains active until the measurement result has been obtained or
until the job is terminated by a command. The measuring process must be reactivated for
each new measurement. :
In contrast, the measuring function need only be activated once for Cyclic measurement
mode. The measuring function remains active until it is deactivated again.
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 out by the user program before new measured values
are accepted.
Result:
●
A maximum of two edges can be evaluated per IPO cycle clock if the scan routine of the
user program is in the IPO synchronous task.
●
A maximum of two edges can be evaluated per position control cycle clock if the scan
routine of the user program is in the servo-synchronous task.
The servo-synchronous task is the lowest possible time level for a user program.
