VEGA VEGALOG 571 CPU and carrier - Manual (Page 20)

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Input cards
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Output cards
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Communication cards for standard bus systems
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Power supply cards for supply of the individual module
cards
The processor card is the centre of VEGALOG. It has the
following functions:
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Communication handling among the individual cards
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Creating and administrating of individual measurement
loops
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Calculating tasks such as adjustment, scaling, linearisa-
tion, differential generation etc.
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Coupling to the PC via RS232 interface
The CPU is further used for detection of levels or for monitoring
the switching on and switching off times.
The CPU read cyclically measured values from the peripheral
cards (e.g. with 30 measurement loop in the 300 ms cycle).
These are compared with the programmed data, standardised
and processed. The programmed data (configuration data,
adjustment parameters etc.) are available in the EEPROM
where they remain even in case of voltage loss. In the memory
of the CPU, a process picture is created which is outputted to
the peripheral cards via LOGBUS.
For backup, the programmed data can be read out any time via
the RS232 interface and can then be saved on the PC.
EA card
Up to ten 0/4 … 20 mA instruments can be connected to the
EA card (Eingang Analog, i.e. input analogue), e.g.:
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Capacitive probes
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Hydrostatic pressure transmitters
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Vibrating level switches
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Conductive probes
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Process and differential pressure transmitters
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Switching contacts (level signaller)
The inputs can be connected actively (sensor is powered by
the EA card) or passively (sensor delivers current).
Within an EA card, mixed connection of active/passive inputs
is permitted.
CPU card
Input cards
20 VEGALOG 571 - CPU and carrier
Set up
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