Toshiba Programmable Controller PROSEC T3 Manual de usuario descargar pdf (Pagina 59)

3. Precautions for I/O Modules

3.2

Precautions in applying

AC input modules

(1) The conditions to read the ON/OFF state of the input signal are

as follows:

Input ON time^ON delay time (OFF->ON)+input reading cycle

Input OFF time^OFF delay time (ON->OFF)+lnput reading

cycle

The input reading cycle means PLC scan cycle for the refresh

input, or the execution interval of the direct input instruction

when using a direct input instruction.

(2) When an AC output sensor is connected to the I/O module, due

to the leakage current from the sensor at OFF, there may be a

voltage which exceeds the maximum OFF voltage between the

input terminals. This will make the PLC unable to read input

OFF when the sensor is OFF. In this case, install a bleeder

resistor between the input terminals to lower the input

impedance.

For selecting a bleeder resistor, refer to 3.1 (3).

(3) if external lines for AC input become longer with using a multi

core cable, induced current may flow to an open wire from

charged wires due to the electrostatic capacity of the cable,

causing an erroneous ON input. In this case, install a bleeder

resistor between the input terminals to lower the input

impedance. Or, you had better apply the DC input.

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Toshiba Programmable Controller PROSEC T3 Manual de usuario Pagina 59