03.01.2013 Views

Toshiba PROSEC T1-16S PLC User's Manual - CTi Automation

Toshiba PROSEC T1-16S PLC User's Manual - CTi Automation

Toshiba PROSEC T1-16S PLC User's Manual - CTi Automation

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

6F3B0253<br />

3. I/O Application Precautions<br />

(4) Countermeasures against leakage current<br />

When a switch with an LED or sensor is used, the input sometimes cannot recognize<br />

that the switch is off due to the current leakage. In this case, install a bleeder resistor<br />

to reduce input impedance.<br />

LE<br />

Bleeder resistor<br />

C<br />

<strong>T1</strong><br />

input<br />

circuit<br />

Select a bleeder resistor according to the following criteria:<br />

(a) The voltage between the input terminals must be lower than the OFF voltage<br />

when the sensor is switched off.<br />

(b) The current must be within the allowable range when the sensor is switched on.<br />

(c) Calculate the wattage of the bleeder resistor by multiplying the current when the<br />

sensor is switched on times three.<br />

Basic Hardware and Function 49<br />

<strong>CTi</strong> <strong>Automation</strong> - Phone: 800.894.0412 - Fax: 208.368.0415 - Web: www.ctiautomation.net - Email: info@ctiautomation.net

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!