HEIDENHAIN PROFIBUS-DP (DPV2) - Manual (Page 25)

Absolute encoder installation
25
The cable gland encoders 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 line 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.
The (A) terminal shall be used to connect the A-line.
The (B) terminal shall be used to connect the B-line.
Figure 10 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 terminal the
bus lines are connected to.