Siemens SIMATIC ET 200M Operating Instructions Manual page 264

Glossary
SYNC
is a control command that is issued by the DP master to a set of DP slaves.
The SYNC control command is used by the DP master to instruct the DP slave to freeze the
output states at the current value. The DP slave stores the output data for the subsequent
frames, while the output states remain unchanged.
After each received SYNC control command the DP slave sets the outputs that were stored as
output dates.
Cyclic updating of the outputs will continue only after the DP master has issued the UNSYNC
control command.
System modification in RUN mode
Modifying a system in RUN mode enables you to change certain configuration settings while
the system is running. Processing is paused for only a few seconds. During this time process
outputs will retain their current values, which in process-related systems has virtually no
effect on the process itself.
A system modification in RUN mode can only be carried out in a distributed I/O scenario.
Terminating resistor
is a resistor that is used to adjust the bus connector performance. Terminating resistors are
always required at cable and segment ends.
For ET 200 the → bus connector is used to turn terminating resistors on or off.
Time stamping
Specifies date and time in messages.
If configured for time stamping, binary input signals are time-stamped when changes occur.
After they have been changed all configured binary input signals must be time-stamped at a
preset accuracy level, such as 10 ms, across the entire system. Therefore, when 2 sensors
(from two different stations) are triggered simultaneously in different PROFIBUS DP master
systems, the time stamp difference for these signal changes must not exceed the preset
accuracy (10 ms in this case).
Time stamping
Specifies date and time in messages.
If configured for time stamping, binary input signals are time-stamped when changes occur.
After they have been changed all configured binary input signals must be time-stamped at a
preset accuracy level, such as 10 ms, across the entire system. Therefore, when 2 sensors
(from two different stations) are triggered simultaneously in different PROFIBUS DP master
systems, the time stamp difference for these signal changes must not exceed the preset
accuracy (10 ms in this case).
264
Operating Instructions, 04/2022, EWA-4NEB7806006-09
ET 200M