It is recommended to use pins 20 and 21 as pairs (both configured to input mode or both configured to output mode).
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It is recommended to use pins 20 and 21 as pairs (both configured to input mode or both configured to output mode). |
This kind of pin is a current sourcing output with a pull-up selection
In other words, the pin connects the load to a positive supply voltage.
This pull-up feature is for open load detection when the pin is used as an output.
These outputs have a switching element called a smart FET. It has integrated features to protect itself and also the external pin, wiring and actuator.
When used as an output, the input feature indicates the output FET's state
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It is recommended to use the function blocks in DigitalOutputDiagnostics library to protect and diagnose outputs when used as digital outputs. For more information, refer to Epec Programming and Libraries Manual. |
This pin can be used as a digital input (DI)
A pin of this type can also be used as an input by using the output state monitoring feature.
In this case, the output functionality of the pin type must be kept in the off state.
It must be taken care in system design that the output unintentionally switching to on state causes no harm to the system.
This pin can be used also with NPN-type sensors – sensors with open collector/open drain.
It’s highly recommended to use closed loop connections when the output pin is used as input. By keeping this simple principle in your mind you will avoid many unknown problems later on.
Electrical characteristics
Symbol |
Parameter |
Conditions |
Min |
Max |
Units |
VLevel |
Output voltage |
Output Off, Pull-up selected, Unconnected pin, Uin = 24 V VLevel = Uin/1,3 |
typ. 18,5 |
V |
|
Io |
Nominal Output Current |
Output
On |
0 |
1 |
A |
Io-lim |
Internal current limitation |
Output On (Note 2, 6) |
typ. 12 |
A |
|
Digital status input |
|||||
RI |
Input Resistance |
Output Off, Pull-up resistor not selected, VI< Uin (referenced to GND) |
typ. 44 |
kΩ |
|
Output Off, Pull-up resistor selected, (referenced to Uin /1,3) |
typ. 8,1 |
kΩ |
|||
VIH |
High Voltage level |
Output Off (Note 3, 8) |
4,2 |
Uin |
V |
VIL |
Low Voltage level |
Output Off (Note 8) |
|
3,2 |
V |
VI-range |
Input voltage range |
(Note 7) |
-0,5 |
Uin |
V |
tI |
Digital Status Input |
(Note 1, 5)
|
> tC |
ms |
|
CI |
Input pin capacitance |
|
typ. 1 |
nF |
|
Note 1: tC denotes software cycle time.
Note 2: Current limit for short circuit protection to protect cabling and to limit internal power dissipation.
Note 3: Exceeding the max value might cause damage to input.
Note 4: The maximum output current depends on the load and temperature.
Note 5: 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 6: When the limit is exceeded, the output voltage circuit starts to limit the current by switching the output voltage. The switching does not affect the application software.
Note 7: Overload conditions
Note 8: Includes hysteresis. The input state is maintained until the second voltage limit is exceeded.
