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5.2.3 User-Output, System-Output, and Hand-Output Circuits (NPN
type)
The following two pages show an example of the configuration and connection of the
Robot Controller's user-input output, system-output and hand-output circuit.
Since the initial resistance of a lamp is small, the output circuit may be damaged by
rush current that flows when the lamp lights.
When directly turning ON and OFF a lamp, use a lamp whose rating is 0.5W or less.
To reduce rush current, select and connect a resistor R that allows dark current 1/3 or
less of the rated current to flow when the lamp goes OFF.
An example of connecting a lamp is shown on page 121.
(1) The User-Output, System-Output and Hand-Output Circuit are open
collector output circuits.
(2) The maximum allowable source current is 70 mA.
Keep the current consumption of a device to be connected to the Robot
Controller, such as a PLC and a relay coil, below the allowable current.
(3) Select an induction load, such as a relay coil, which has a built-in diode
(for absorbing inverse electromotive force).
To use an induction load without a built-in diode, add a diode equivalent to
the 1S1888 (Toshiba) in close vicinity to the coil.
Caution: When externally attaching a diode, connect it with correct
polarity. Incorrect polarity may damage the Output circuit.
(4) Connecting a lamp requires a circuit through which dark current flows.
Caution: Since the initial resistance of a lamp is small, the output
circuit may be damaged by rush current that flows when
the lamp lights.
Refer to page 121.
(5) When using the internal power source, prepare a PLC input circuit unit that
does not contain a power source.
Caution: Keep the total current capacity of the internal power source
below 1.3A.
(6) Use a multi-core shielding cable for the purpose of protecting the devices
from external noise. Ground it to the robot controller.
(7) +24V internal power source of the robot controller must not be grounded.
Caution: If the output terminal +24V of internal power source is
grounded, there may be a case where the controller is
damaged.