
Dra
No.
Title
SheetDescri
tionDesi
n Date Edit
FANUC Pulse Input Type
Digital Servo Adapter
Connection Manual (Hardware)
A-77226EN
/
41
6.2.2 Output Signal Requirement
The PDSA uses source-type output signals that comply with safety
standards.
The output signals are rated as follows:
Maximum load current with the driver turned on:
200 mA (including an instantaneous value and ripple)
Saturation voltage with the driver turned on:
1.0 V (maximum)
Dielectric strength:
24 V +20% (including an instantaneous value)
Leakage current with the driver turned off:
100 µA (maximum)
The output signals require an external power supply rated as
follows:
Supply voltage:
+24 V +10% (including an instantaneous value)
Supply current:
At least the total maximum load current (including an
instantaneous value) + 100 mA
Turn-on timing:
Before the PDSA supply is turned on
(with a maximum allowable time lag of 500 ms)
Turn-off timing:
Same time or after the PDSA supply is turned off
Connect the power supply that meets the above requirements to the
output signal power supply pins (DOC and 0V) of each DI/DO
connector. It is necessary to connect 24 VDC to all DOC pins.
NOTE
Use 30/0.18 (0.75 mm
2
) or heavier wire as the power cable.
The output signal driver can output up to eight signals.
The driver element monitors the current of each output signal. If
an overcurrent is detected, the output of that signal is turned off.
Once a signal has been turned off, the overcurrent will no longer
exist, such that the driver turns the signal on again. Therefore, in
the case of a ground fault or overload, the output of a signal will be
repeatedly turned on and off. This also occurs when a load that
causes a high surge current is connected.
The driver element contains an overheat detector, which turns off
all eight output signals if the temperature in the device exceeds the
set value as a result of an overcurrent caused by a ground fault or
some other failure. This off state is held. To restore signal
output, logically turn the output off then back on again, for each
signal, after the temperature falls below the set value. Signal
output also can be restored by turning the system power off then
back on again.
If the output of a signal cannot be turned on even though the
diagnostic indicates that the signal is on, that signal or another
signal being handled by the same element may be overloaded, thus
causing the eight output signals to be turned off. In such a case,
turn the system power off and eliminate the cause of the overload.