VEGA FIBERTRAC 31 Profibus PA - Manual (Page 25)

25
5 Connecting to power supply
FIBERTRAC 31 • Profibus PA
43833-EN-131119
5.4 Connection - Summation
To measure the level in very high vessels, multiple instruments can be
cascaded.
Cascading means that two or several instruments are connected
which can together cover a longer measuring range.
The instrument acts as Master and all other instruments operate as
Slaves.
The pulse rates of all instruments are summed in the Master instru-
ment and converted into a common signal.
The Master instrument must have the function "Level". For this
purpose, select under the menu item "Setup/Application" the function
"Level".
Set the address setting (MGC) on the Master instrument to "0 - 0".
For this purpose, the Slave instruments must be defined as "Slave".
Select under the menu item "Setup/Application" the function "Sum-
mation Slave".
The address setting (MGC) on the Slave instruments can be freely
selected. Only the address "0 - 0" is reserved for the Master instru-
ment.
Connect the instruments according to the following wiring plan:
Electronics and connec-
tion compartment - sum-
mation