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A P-NET device is connected to the fieldbus by means of 3 terminal connections, the A ter-
minal, the B terminal and the S terminal.
The connection from one device to the next unit is performed by connecting A to A, B to B
and S to S. The S terminal must not be connected to ground. If the length of the cable is
more than 100 m, the bus cable will have to be connected from field device to field device,
forming a physical ring.
For further information regarding P-NET installation, wiring, and cable types, please refer to
the P-NET Installation Guide on
Electrical specification for P-NET:
Topologies:
Medium:
Cable length:
Manual
www.proces-data.com/P-NET_Installguide.html
Physical ring without termination, or bus topology.
Shielded twisted pair cable with minimum .22 mm² area conduc-
tors and characteristic impedance of 100-120 ohm. For example
TWINAX IBM part No. 7362211 with 105+/-5 ohm, 51 pF/m.
Max. 1200 m (EIA RS 485).
Flow Transmitter, PD 340
502 010 05
25/55
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