HEIDENHAIN PROFIBUS-DP (DPV0) - Manual (Page 15)

Encoder gateway installation
15
The cable gland gateway shall be equipped with twisted pair
shielded cable in accordance with EN 50170 and PROFIBUS
guidelines. The guidelines recommend a conductor area higher
than 0,34 mm 2 . Permissible outer cable diameter is ø 8 mm to
ø 10 mm for the bus lines cables. Located inside the back cover
are four screw terminals containing the required bus line
terminals marked A and B. Cable glands not used, should be
replaced with a M16 filler plug to ensure proper sealing.
Figure 6 Terminal connections of bus line cables
Note:
Tighten all screws in the terminal, even if no cable
has been attached.
Note:
The two A terminals are internally connected to
each other and the two B terminals are also
connected to each other so it does not matter to
which the bus lines are connected to.