Technical data
6.2 System behavior
TM15 / TM17 High Feature Operating Manual
76 Commissioning Manual, 05/2009
6.2 System behavior
The following timing data relate to a clock cycle setting of
IPO: Servo: Bus cycle clock = 1 : 1 : 1 and a scan routine in the IPO synchronous task.
Note
The following describes the system behavior for PROFIBUS and can also, in principle, lay
the basis for PROFINET configurations.
6.2.1 System behavior with binary inputs and outputs
The system behavior for digital inputs and outputs is shown in the figure below:
',
,32
V\QFKUR
QRXV
WDVN
,UUHOHYDQW
6HUYR
8VHU
SUR
JUDP
'2
,UUHOHYDQW
8VHU
SUR
JUDP
8VHU
SUR
JUDP
8VHU
SUR
JUDP
758(
LQ
7
RXW
7
,32
7
)$/6(
)$/6(
Figure 6-4 System behavior with digital inputs and outputs (TM15 and TM17 High Feature) with user program in the IPO
synchronous task level
A digital input channel (DI) is always sampled at time T
in
at the end of each IPO cycle clock.
A digital output channel (DO) is always activated at time T
out
at the beginning of the IPO
cycle clock.
If the user program is executed in the IPO synchronous task, a DI state change (TRUE) in
the first IPO cycle clock (#1) is detected in the next IPO cycle (#2). If an output signal
(FALSE) is activated in response, it is first processed in position control cycle clock #3 and
then transmitted to the module via PROFIBUS at the beginning of the next IPO cycle clock
#4 (assuming an IPO: servo ratio of 1:1).
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