This type of pin is a digital input (DI) including a pulse counting (PI) feature.
This kind of pins have a pull-down resistor to ground
Pulse inputs can be used as a 1 or 2 channel pulse counter and they have a reset possibility. Possible software channels and pairs are listed in Epec Programming and Libraries Manual, section Programming 4602 > I/O > Pulse Inputs.
The configurable features are controlled by a control signal:
pull-up enable selection to internal +5 V
Electrical characteristics
|
Symbol |
Parameter |
Conditions |
Min |
Max |
Units |
|
RI |
Input Resistance |
Input high; Referenced to GND
|
|
12,2 |
kΩ |
|
Input Low; Referenced to 5 V |
|
2,2 |
kΩ |
||
|
Vlevel |
Voltage level |
Unconnected pin, no pull-up selected |
typ. 0 |
V |
|
|
Unconnected pin, pull-up selected |
typ. 4,6
|
V |
|||
|
VIH |
Input High Voltage |
Overload conditions (Note 1, 6) |
3,3 |
33 |
V |
|
VIL |
Input Low Voltage |
(Note 6) |
-0,5 |
1,7 |
V |
|
fI |
Input Frequency (frequency measurement and pulse counting) |
(Note 4, 5) |
|
20 |
kHz |
|
Input Frequency |
(Note 2, 3) |
|
1/ 2tC |
kHz |
|
|
tI |
Input Pulse Width |
|
0,025 |
10000 |
ms |
|
CI |
Input Capacitance |
|
typ. 1 |
nF |
|
Note 1: Exceeding the max value might cause damage to input.
Note 2: tC denotes the software cycle time in milliseconds.
Note 3: The pulse width must be greater that the software cycle time. For example with 50/50 pulse ratio, the pulse frequency is 1 / (2*pulse width)
Note 4: The maximum value can be reached with 50 % duty cycle.
Note 5: The maximum frequency sum for all the pins is 40 kHz.
Note 6: Includes hysteresis. The input state is maintained until the second voltage limit is exceeded:
