Festo IFB05-03, Manual

Page: 62 / 154

3. Installation
3−28
Festo P.BE−VIFB5−03−EN en 0503e
3.4.3 Terminating resistor
If the valve terminal to be connected is at the end of a field
bus string, a terminating resistor (120 Ohm, 0.25 Watt) must
be fitted in the socket of the incoming field bus cable (adap
tion necessary). The unused field bus plug must be sealed
with a protective cap (protection class IP 65).
Proceed as follows (see diagram below).
1. Crimp the wires of the resistor together with those of the
incoming field bus cable between the cores S+ (pin 1) and
S− (pin 3) of the bus cable socket.
In order to guarantee reliable contact, we recommend
that you crimp together the wires of the resistor and
those of the incoming field bus cable in common end
sleeves.
Fig.3/17: Fitting the terminating resistor
2. Fit the bus cable socket onto one of the field bus plugs.
3. Seal the unused field bus plug with a protective cap.