User-Output and　System-Output Circuits

The following two pages show examples of the user-output and system-output circuit configurations and connections of the parallel I/O board.

1. The user-output and system-output circuits are open collector output circuits.
2. Keep the current consumption of a device to be connected, such as a PLC or a relay coil, below the allowable current level.
   · The maximum allowable sink current is 70 mA. (NPN type)
   · The maximum allowable source current is 70 mA. (PNP type)
3. Select an induction load that has a built-in diode (for absorbing inverse electromotive force), such as a relay coil. To use an induction load without a built-in diode, add a diode equivalent to the 1S1888 (Toshiba) in close vicinity to the coil.
   · When externally attaching a diode, connect it with the correct polarity. Incorrect polarity may damage the output circuit.
4. When connecting a lamp, set the rating voltage of the lamp to 1.5W or less so that dark current flows. Since the initial resistance of a lamp is small, rush current that flows when the lamp lights up may damage the output circuit. To reduce the risk of damage from rush current, select a level of resistance so that dark current of a third of the rating current flows when the lamp is off.
5. When using the internal power source, prepare a PLC input circuit unit that does not contain a power source.
   · The maximum allowable capacity for the total of Mini I/O, Hand I/O and Parallel I/O of the internal source is 1.3A. Use the internal source within this allowable range.
6. Use a multi-core shielding cable for the purpose of protecting the devices from external noise.
7. +24V output internal power source of the robot controller must not be grounded.
   · Doing so may damage the controller.
   
8. Do no use as signals for excess condition from the time of turning on controller to during the running of software.