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DIGITAL INPUTS / FOUNDATION
™
FIELDBUS (OPTIONS)
13 - 2
ETC00781(4) Series 100 e 02/2004
13.1.3 Valve Control
The inputs “E4 to E7” are level sensitive with descending priority. That means “E4” has highest
priority and “E7” has lowest priority.
At input “E4” (open zero gas valve) a “high-signal” opens the zero gas valve and closes all the
other valves, no matter of the signal levels at “E5 to E7”.
A “high-signal” at “E5” opens the span gas valve 1and closes all the other valves if “E4” has
“low-level”, no matter of the signal levels at “E6 and E7”.
Input “E7” has a special logic: A “low-level” opens and a “high-level” closes the sample gas
valve, whereat the inputs “E4 to E6” have to be at “low-level”.
13.1.4 Pump Control
For the case, that the optional gas sampling pump is controlled via digital input (see chapter
8.18) this is done using input “E7”, too. A “low-level” on “E7” switches on and a “high-signal”
switches off the gas sampling pump, irrespective of the signals at “E1 to E6”.
13.2 FOUNDATION
™
Fieldbus
*)
For communication via FOUNDATION
™
Fieldbus terminals are available at the analyzer's rear
side(Fig. 1-8, Item 9).
For exact description see separate FOUNDATION
™
Fieldbus specific manual!
Observe the wiring hints in chapter 29.10 !
*)
only possible if serial interface RS 232/485 is not request !
Fig. 13-2: Terminal strip assignments “Fieldbus connection”
FB +
FB -
FB +
FB -
Fieldbus +
Fieldbus -
Fieldbus +
Fieldbus -