Commissioning and Diagnostics
6-7
Distributed I/O Device ET 200M
EWA-4NEB780600602-06
Startup for Time Synchronization/Time Stamping of Signal Changes
Is
the clock
set in the
IM 153-2?
Are suitable
time stamping parameters
available
for configuration?
Redundancy?
Create startup data:
Read the states of the configured
digital inputs;
process interrupt to DP master, so
that the message buffer is read
No
No
Yes
Yes
Startup is completed as in
Figure 6-3.
The IM 153-2 is ready for data
transfer with the DP master.
In a redundant configuration, the
passive IM 153-2 always has an
image of the time stamping
messages.
Redundancy?
Read time frame
Set the IM 153-2 clock
Current time
Diagnosis of the time frame:
In the event of a failure or a time jump
greater than the permissible tolerance,
a special message is generated and
an entry made in the message buffer
Clock in the IM 153-2
Monitoring of the configured digital
inputs: In the case of a change, the
message and entry are created in the
message buffer
Process interrupt to DP master, so
that the message buffer is read
Error message to DP master;
digital input signals are not time
stamped.
Does not impair ”normal” data
transfer with the DP master.
Redundancy?
Time is set to
01.01.1984; 00:00
Figure 6-4
Startup for time synchronization/time stamping
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