Siemens SIMATIC ET 200M Operating Instructions Manual page 149

8.2.4.2 Operating principle
● The 240 data record is the configured data record for the time stamping on the ET 200M.
● If the input signal on one of the monitored inputs changes, this event is time stamped by
● Then the IM 153-2 triggers a process interrupt.
● The master reacts with a diagnosis requirement to the slave.
● The IM 153-2 responds to this with a diagnostic frame. This diagnostic frame includes,
● Because of this diagnostic frame the associated run level "process interrupt" is launched
● The user program monitors entries in the run level "process interrupt". As soon as an
● In accordance with the requirements of your application, the data record is saved or
ET 200M
Operating Instructions, 12/2008, EWA-4NEB780600602-08
It defines which modules and which input channels of which type can be called upon by
the IM 153-2 for the time stamping.
When accepting the data record 240 the consistency of the data record with the
configured structure of the slave is checked.
As soon as this data record 240 is transmitted correctly to the IM 153-2 the time stamping
is activated.
the IM 153-2 and stored in one of hte data records 100 to 114.
among other things, the number of the data record that includes the time-stamped
messages.
in the user program. Within this run level, the user must be able to tell which data record
is to be read with messages from the IM 153-2. Depending on the application case, the
user must also ensure multiple calls on this run level.
In your CPU´s manual, look up DPV1-blocks, e.g. "RALRM".
entry is detected, the data record is read from the IM 153-2. A block in accordance with
DPV1 also serves to do this.
Refer to DPV1-blocks, e.g. "RDREC" in your CPU´s manual.
further processed. Every single signal message comprises 12 bytes, a data record can
include up to 20 messages.
8.2 Time stamping the input signals with IM 153-2
Functions
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