6. CONNECTION OF I/O UNITS TO
The output signals of the I/O card (sink type) drive lamps, LEDs, and
relays. The signals are output directly from NPN transistors which form
a non-isolated interface.
To drive an additional external unit, a power supply of 24 VDC needs to
be supplied by the user. In this case, connect the 0-V terminal to 0V (0-V
terminal in the output connector).
Specifications of the output signals
Maximum load current when output is on :
200 mA or less including momentary current
Saturation voltage when output is on :
1.6 V maximum and 1.0 V average when the load current is 200 mA
Dielectric strength when output is off :
24 V within +20% including surge voltage
Leakage current when output is off : 100µA or less
Fig. 6.8.2 I/O card (sink type) output signal regulation
When a sink output interface is used, a ground fault in an
output signal causes the output signal to remain on. From
the viewpoint of safety, therefore, FANUC does not
recommend the use of such an interface for output signals.
Specifications of the
Output Signals of the
I/O Card (Sink Type)