Technical Manual &
Cabling Instructions
Page 17 / MAN000596
DO/DI
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7 DO/DI
Possible pin modes:
• Sourcing DO mode (pull-up)
• Sourcing DO mode (pull-down)
• DI mode (pull-up)
• DI mode (pull-down)
7.1 DO (digital output) mode
• This pin type is a current sourcing output with a pull-up selection
• 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
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.
7.2 DI (digital input) mode
• This pin can be used as a digital input (DI) by using the output state monitoring feature
• In this case, the output (DO) functionality of the pin type must be kept OFF
• 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 an
input. By keeping this simple principle in your mind you will avoid many unknown problems
later on
Electrical characteristics
V
Level
Output voltage
Output Off, Pull-up
selected, Unconnected
pin,
U
in
= 24 V
V
Level
= U
in
/1,3
typ. 18,5 V
I
o
Nominal Output Current
Output On
(Note 3, 4)
0 1 A
I
o-lim
Internal current limitation Output On (Note 2, 6) typ. 12 A
R
I
Input Resistance
Output Off, Pull-
not selected, V
I
< U
in
(referenced to GND)
typ. 44 kΩ
Output Off, Pull-
selected, (referenced to
U
in /1,3)
typ. 8,1 kΩ
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