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

3. I/O Application Precautions
3.1 Application precautions for input signals
! WARNING
48 T1-16S User’s Manual
6F3B0253
(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.
V
I
Configure emergency stop and safety interlocking circuits outside the
T1-16S. Otherwise, malfunction of the T1-16S can cause injury or serious
accidents.
R
I 2
Bleeder resistor
I 1
T1
input
circuit
V
R
I I
Wattage V
=
− 1
2
> × 3
R
(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 • For PNP open collector
C
T1
input
circuit
C
T1
input
circuit
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