69
6.3. Connecting the digital inputs and outputs.
6.3.1. Connecting the LED or the optron input. Option 1
DO (1-16)
GND
R
L-502
The LED is lit when the DO output is at the
"logical unit".
6.3.2. Connecting the LED or the optron input. Option 2
R
+3.3V
L-502
DO (1-16)
The LED is lit when the DO output is at the
"logical zero".
6.3.3. Connecting a contact to a digital input
6.3.3.1. Option 1
6.3.3.2. Option 2
+3.3V
R1
DI (1-16)
AGND
K1
L-502
DI_SYN1,2
A logical unit corresponds
to an open contact. The
recommended resistor R1
nominal is from 3 to 5
kOhm.
R1 is not required if the
internal pull-up resistor is
programmed on the
corresponding input.
+3.3V
R1
DI (1-16)
AGND
K1
L-502
DI_SYN1,2
The open contact
corresponds to a logical
zero. The recommended
resistor R1 nominal is
from 3 to 5 kOhm. In
this case, the internal
pull-up resistor should
be turned off.
