Toshiba 6F3B0250, PROSEC T1 T1S user manual Wattage V 2 ´

6F3B0250

3. I/O Application Precautions

(2)Minimum ON/OFF time of the input signal

The following conditions guarantee correct reading of the ON/OFF state of the input signal:

Input ON time: ON delay time + the time for one scan

Input OFF time: OFF delay time + the time for one scan

The ON and OFF times of the input signals must be longer than these intervals.

(3)Increasing the contact current

The reliability of some contacts cannot be guaranteed by the specified input current. In this case, install an external bleeder resistor to increase the contact current.

V

I

R

Bleeder resistor

I1	T1
	input
I2	circuit

R = V

I - I 1

Wattage > V 2 ´ 3

R

Note) The above solution cannot be applied to the T1-16 dry contact input.

(4)Connecting transistor output device

An example of connecting a transistor output device to T1/T1S’s input circuit is shown below.

· For NPN open collector

	n
	T1
V	input
	circuit

T1-16 dry contact input

(current source)

·For PNP open collector

+

T1

n input

circuit

V

T1-16 dry contact input

(current sink)

n
	T1
	input
C	circuit
V

T1-28, T1-40 and T1-40S DC input

VC

T1

n input circuit

T1-28, T1-40 and T1-40S DC input

Basic Hardware and Function 63

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