Endress+Hauser NRF81 - Page 19

Tankside Monitor NRF81 Electrical connection
Endress+Hauser 19
Terminals of the "V1" and "WM550" module
Designation of the module in the operating menu: V1 X1-4 or WM550 X1-4; (X = A, B, C or
D)
• X1
2)
• Terminal name: S
• Description: Cable shielding connected via a capacitor to EARTH
• X2
1)
• Terminal name: -
• Description: not connected
• X3
1)
• Terminal name: B-
• Description: Protocol loop signal -
• X4
1)
• Terminal name: A+
• Description: Protocol loop signal +
2) Here, "X" stands for one of the slots "A", "B", "C", or "D".