Functions
8.2 Time stamping the input signals with IM 153-2
ET 200M
Operating Instructions, 12/2008, EWA-4NEB780600602-08
141
8.2.3 Time stamping within the S7-400
8.2.3.1 With STEP 7 in customer applications
In customer applications a time stamping of digital input signals with a precision of 10 ms
and 1 ms is possible. In doing so, the rules and requirements listed above under
"Functionalities (Page 132)" apply. In the unit, a time synchronization must take place.
The FB 62 (FB TIMESTMP) is an essential component for time stamping as an interface to
the IM 153-2.
The evaluation of the time-stamped signals takes place via the user program (customer
application). You´ll find more information on this in the
Online-help for STEP 7
. The following
figure shows the storage location of the FB 62 in the standard library of
STEP 7
.
Figure 8-8 Storage location of the FB 62 in STEP 7
8.2.3.2 With the PCS 7 system solution
The 10-ms time stamping of signal changes is consistently supported in the
PCS 7
by all the
hardware and software components: by IM 153-2 via an S7-400 up to the Operator Station
with WinCC for unit visualization.
Essential components for the time stamping are
● the driver block FB 90 (FB IM_DRV) as an interface to the IM 153-2
● WinCC for the visualization
You´ll find a detailed description for time stamping with 10 ms precision and for time
synchronization in the "Process control system PCS 7 10 ms time stamping
(http://support.automation.siemens.com/WW/view/en/15231179
)" manual.
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