Interference Elimination; Connection Types - ABB IRB 6400R Product On-Line Manual

Connecting Signals
Profibus DP:
Cables according to Profibus DP specification should be used for connections between
the I/O unit DSQC 352 and the external Profibus DP bus.

3.3 Interference elimination

Internal relay coils and other units that can generate interference inside the controller
are neutralised. External relay coils, solenoids, and other units must be clamped in a
similar way. Figure 29 illustrates how this can be done.
Note that the turn-off time for DC relays increases after neutralisation, especially if a
diode is connected across the coil. Varistors give shorter turn-off times. Neutralising the
coils lengthens the life of the switches that control them.
+24 V DC
+24 V DC, or AC voltage
Figure 29 Examples of clamping circuits to suppress voltage transients.

3.4 Connection types

I/O, external emergency stops, safety stops, etc., can be supplied on screwed connec-
tions or as industrial connectors.
Designation
X(T)
XP
XS
38
+0 V
+0 V
R C
Screwed terminal
Male (pin)
Sockets (female)
Installation and Commissioning
The diode should be dimensioned for the
same current as the relay coil, and a voltage
of twice the supply voltage.
The varistor should be dimensioned for the
same energy as the relay coil, and a voltage of
twice the supply voltage.
R 100 ohm, 1W
C 0.1 - 1 µF
> 500 V max voltage
125 V nominal voltage
Product Manual IRB 6400R