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5 Connecting to power supply
FIBERTRAC 31 • Profibus PA
43833-EN-170126
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 "99".
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 "99" is reserved for the Master instrument.
Note:
Make sure that all instruments are using the same software version.
Software version 2.0 is not downward-compatible.
Connect the instruments according to the following wiring plan:
Electronics and terminal
compartment - summa-
tion
