Operating Instructions
IS1 PROFIBUS 3.00 E
- Technical alterations reserved -
100
PROFIBUS DP interface for IS1+
3.12 Online behavior of the IS1+ field station.
The IS1+ field station is supporting the standard start-up behavior with a class 1 master (see 2.11 start-up
behavior). Additionally the following features are supported:
Parameter change.
If an IS1+ field station is in data exchange with a DP master, the telegram ´Set_Prm´ (send parameter) can be
transmitted from the master to the field station between the cyclic data telegrams.
The field station checks the length of the telegram ´Set_Prm´ and accepts the new parameter data without
leaving data exchange if the length of the telegram is OK.
With this, online changes of parameter data of the IS1+ field station from a PROFIBUS DP (Class1 V0) master
are possible.
If the length of the ´Set_Prm´ telegram is not OK the new parameter data are not accepted. The field station
changes to the mode ´wait parameter´ whereby a new start-up of the cyclic communication is forced.
Configuration change.
If a IS1+ field station is in data exchange with a DP master, the telegram ´Chk _Cfg´ is only accepted from the
field station if the configuration data of the field station has not changed.
If a telegram ´Chk _Cfg´ with changed configuration data is received during data exchange, the field station is
leaving the data exchange and goes to the mode ´wait parameter´ whereby a new start-up of the cyclic
communication is forced.
If a master wants to change the configuration data of the field station or wants to interrupt the data exchange
for a defined time, the data exchange should be stopped from the master by sending the telegram ´Set_Prm´
with ´Unlock_Req = TRUE´ (Lock). This will bring the field station to the mode ´wait parameter´.
After this the master can do a new start-up with new configuration and parameter data.
With the parameter ´ timeout for output modules´ or via response monitoring (see chapter 3.4.2) the output
signals of the field station can be freezed during an interruption of the data exchange for a parametrizable
time.
If the master is coming back to data exchange with the field station before exceeding of this watchdog times,
the output signals are not going to the selected save position and are now updated cyclic from the master
again.
If the master has changed configuration data, which has influence to the signal marshaling in the data
telegrams, he is responsible for the correct new marshaling inside of the master and the PLC / DCS.
During the new start-up the field station is checking the new configuration and parameter data individually for
each slot (each I/O-module).
All modules of the field station where the configured module type agree with the existing module type in the
field station are updated cyclically after start-up.
For modules, which do not agree with the configuration data, alarms are generated. The signals of this modules
are not updated and react according the parameterized behavior in case of error.
