14
8903/PB Profibus Communications Interface
Conversion of DSE Type < > Profibus Type
The DSE fieldbus connectors are each assigned a Profibus PLC "Type" as described in "Step 1.3
: Configuring the Fieldbus Connectors" on page 12.
The conversion between the DSE type and the PLC type is performed automatically (refer to
Appendix B : DSE/Profibus Conversion Rules, page 21).
Any PLC type can be assigned to a fieldbus connector
Some recommended PLC type assignments to fieldbus connectors are given in the table below:
Fieldbus Connector
PLC Type
PLC Size
LOGIC
Boolean
byte
INTEGER
Integer32
dword
VALUE
FloatingPoint
dword
Profibus Status Information
The Profibus function block in DSE 890 provides status information about the Profibus network
interface.
When online, the
actual
Address in use can be found by clicking the right mouse button over
the “Address:” text and selecting
Get
. This may be different to the Address set in the function
block configuration if the switches on the TechCard have set the Address.
The function block also provides two status outputs that can be wired to: STATUS and DATA
EX.
For example, the DATA EX output could be ANDed with the motor START causing the drive
to stop if the PLC connection is lost.
STATUS
Enumerated value:
Status
0: MISSING OR FAULT
1: DISABLED
2: BAUD SEARCH
3: WAIT PARAM
4: WAIT CONFIG
5: DATA EXCHANGE
6: DATA EXCH NO WD
7: DATA EXCH ERROR
8: DATA EXCH ER NO WD
DATA EX
Logic value:
True (T) indicates that the Profibus interface is in the Data
Exchange state.
The STATUS output could be used with the LOGIC::LOOKUP function block to determine a
particular state.
