VEGA VEGACOM 558 Ethernet - Manual (Page 30)

30 VEGACOM 558 Ethernet
6.4 Storage of the contact outputs
when connected to LOGBUS
Beside the previously described measured
values, it is also possible to transfer
switching conditions of the VEGALOG 571
processing system via VEGACOM 558.
This particularly includes:
- status of the contact outputs of the AR
cards (relay contacts)
- status of the contact outputs of the AT
cards (transistor outputs)
In contrast to the imaging of measured
values, the imaging of switching status is
done "bit-oriented". In the standard, these
status bits are also called "register bits". The
addressing of the register bits for Modbus
systems is therefore "bit-oriented". In
VEGACOM 558, a switching status is
represented by one register bit, whereby all
available information of a VEGALOG output
card type AR or AT is saved within an
associated block of 16 register bits. The
storage of a 16 register bit block within
VEGACOM 558 depends on the module
position in VEGALOG 571.
The addressing by the control system is
done via existing library enquiries of a
process control system (e.g. Modicon).
Image of the switching status in VEGACOM 558 for
VEGALOG 571
on
PC
VEGALOG 571
!
Output status of the output card on
module #1
Output status of the output
card on module #32
Data image in VEGACOM 558
Temporary memory of
VEGACOM 558