Application Precautions For Input Signals - Toshiba PROSEC T1-16S User Manual

3. I/O Application Precautions

3.1 Application precautions for input signals

!
WARNING
(1) 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.
(2) 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.
I
V
(3) Connecting transistor output device
An example of connecting a transistor output device to T1-16S's input circuit is shown
below.
For NPN open collector
48
T1-16S User's Manual
Configure emergency stop and safety interlocking circuits outside the
T1-16S. Otherwise, malfunction of the T1-16S can cause injury or serious
accidents.
Bleeder resistor
I
T1
1
R
input
circuit
I
2
T1
input
circuit
C
V
R
I I
1
2
V
Wattage 3
R
For PNP open collector
6F3B0253
C
T1
input
circuit