HBM PW15iA Notice De Montage page 33

Interfaces
Important
You must connect bus termination resistors (each 120 W)
at the start and at the end of the bus. The electronics do
not contain a bus termination resistor for DeviceNet.
You should only activate the resistors at the ends of the
bus system. If you activate more than 2 termination resis­
tors, or they are not located at the ends, only limited
communication will be possible (bus errors) or it will no
longer work at all.
All the lines refer their level to GND. GND (0 V) of the
excitation voltage must therefore also be connected, but
you must not connect GND to the shield. Use a separate
line to connect the node digital ground to the power sup­
ply GND (0 V). Connect the cable shields extensively to
the connector plug housings.
PW15iA 31
A4359-1.0 HBM: public