VEGA VEGACOM 557 Siemens 3964 and 3964 R procedure with RK 512 - Manual (Page 5)

VEGACOM 557 Siemens 5
Product description
DISBUS
LOGBUS
CP524/
CP525
Function VEGACOM 557
Buffer
memory Proc-
ess
image Trans-
mis-
sion
memory
Test
conver-
sion
1.3 Function
DISBUS
The new generation of VEGAMET 500 signal
conditioning instruments can transfer meas-
ured data and status information via the
DISBUS to VEGADIS 174 indicating instru-
ments.
VEGACOM 557 receives as participants on
the DISBUS these data in a DCS telegram.
The telegrams are written in VEGACOM 557
into a buffer memory.
LOGBUS
Data are permanently exchanged on the
LOGBUS between the individual components
of VEGALOG 571. VEGACOM 557 receives
as participant of this LOGBUS the part of the
telegrams containing the measured values
and status information.
Communication process
The data communication between VEGACOM
557 and the communication processor
CP 524/525 is only made if initiated by the
PLC which can call up the requested informa-
tion via special commands. The data from
DISBUS/LOGBUS are first written in a buffer
memory in VEGACOM 557.
From this buffer memory, the data set is
transferred into a process image. The protec-
tion converter software enquires the individual
storage section cyclically for the saved val-
ues. The data sets are tested and converted
into the Siemens 3964 or 3964 R data format.
After this conversion, the data are transferred
into the transmission memory and further
transferred to the communication processor.
There, they are read in via a S5 PLC func-
tional component and saved in a data compo-
nent for further processing.
The D-SUB plug in the front plate of
VEGACOM 557 is used for connection of a
PC. In conjunction with the indicating and
adjustment software VEGA Visual Operating
(VVO) configuration and parameter setting of
the VEGAMET signal processing instruments
or the VEGALOG processing system are
possible. In addition measured values and
failure messages can be shown graphically
via the visualisation software Visual VEGA
(VV).
In a planned level, Simatic S5 can additionally
call up beside measured data and status
information also parameters from VEGAMET/
VEGALOG, receive them, if necessary modify
them and return them. This strategy enables
the control of level measurement and process
pressure measuring systems via processing
systems.
Connection VEGACOM 557 on DISBUS
Connection VEGACOM 557 on LOGBUS
DISBUS
LOGBUS
Simatic
S5
CP
524/525
1 ………… 15
VEGAMET
VEGACOM 557
with additional
board S5
Proce-
dure
3964 /R
Instru-
ment
interface
RS 232/RS485/
RS 422/TTY
Simatic
S5
CP
524/525
Procedure
3964 R
Instru-
ment
interface
RS 232/RS485/
RS 422/TTY
VEGACOM 557 with
additional board S5 VEGALOG
571 CPU