Brainboxes IE-780 Informations techniques télécharger pdf (Page 22)

OPTO DIO Reference Read This First.

the external isolated power supply applied.

Do not make any assumptions about the effects of changes

made to the external circuit if the power off and reset conditions

are critical to the safe operation of your system.

Figure 1-12. Input Port Schematic.______________________________

Input Port Schematic.___________________

The input port schematic is given in Figure 1-12. The input

port lines are reverse connection protected and current limited.

Input voltages of 0.0 - 2.38 Volts read as input logic low, 0.

Input voltages of 2.4 - 24.00 Volts read as input logic high, 1.

The inputs are current limited by a 3k3 Ohm resistor and

are reverse connection protected by diodes.

The Watch Dog.______________

The watch dog is a failsafe method of ensuring that the

user’s program is still running correctly. On power up, the watch

dog is disabled. If the user’s program enables the watchdog, an

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Brainboxes IE-780 Informations techniques Page 22