2 profibus characteristics of vegacom 557, Object directory (ov) – VEGA VEGACOM 557 Profibus FMS User Manual
Page 19
VEGACOM 557 Profibus FMS
19
Setup
6 Integrate S5 program (on diskette), which reads in measured values, into your own
application
- Enquire in OB21 and OB22 the functional component FB249 (SYNCHRONOUS)
- Transfer data component DB240 to your own application
- Initialise measured value data components (standard: DB220-235)
- Transfer functional component FB210 or FB211 and/or FB212 into your own application
Note:
The applied functional components must be called up in every program cycle
7 Transfer components to AG
4.2 PROFIBUS characteristics of VEGACOM 557
VEGACOM 557 PROFIBUS supports PROFIBUS-FMS. FMS describes the communication
objects, the application services and the resulting models from the user's point of view. The
function of VEGACOM 557 is that of the slave. E.g. a communication processor CP5431 can
be used as PROFIBUS master.
Object directory (OV)
All communication objects are entered in the local object directory (OV). The OV contains the
description of the structure, the data types and the internal address assignment. The master
(here CP5431) has access to the entered objects. The static OV is as follows:
Object
Type
Length
Number of
Password
Access
Access Rights
Symbol
index
elements
Group
(Hex)
1000
Octett-String
6
16
0
0
READ_ALL
MESSWERT-01
1001
Octett-String
6
16
0
0
READ_ALL
MESSWERT-11
1002
Octett-String
6
16
0
0
READ_ALL
MESSWERT-21
1003
Octett-String
6
16
0
0
READ_ALL
MESSWERT-31
1004
Octett-String
6
16
0
0
READ_ALL
MESSWERT-41
1005
Octett-String
6
16
0
0
READ_ALL
MESSWERT-51
1006
Octett-String
6
16
0
0
READ_ALL
MESSWERT-61
1007
Octett-String
6
16
0
0
READ_ALL
MESSWERT-71
1008
Octett-String
6
16
0
0
READ_ALL
MESSWERT-81
1009
Octett-String
6
16
0
0
READ_ALL
MESSWERT-91
100A
Octett-String
6
16
0
0
READ_ALL
MESSWERT-A1
100B
Octett-String
6
16
0
0
READ_ALL
MESSWERT-B1
100C
Octett-String
6
16
0
0
READ_ALL
MESSWERT-C1
100D
Octett-String
6
16
0
0
READ_ALL
MESSWERT-D1
100E
Octett-String
6
16
0
0
READ_ALL
MESSWERT-E1
100F
Octett-String
6
16
0
0
READ_ALL
MESSWERT-F1
In the OV you can see that 16 groups with 16 elements each are available. They represent the
256 measured values. Each measured value consists of 6 octets (including index and status
information). For access to the first 16 measured values, the master has to send a READ serv-
ice with index = 1000 hex to the slave.
The indices are required in the S5 program for placing the order to the CP.