Data Sheet

11
These functions are evaluated directly in the processor within the group and are not dependent on the
control software. Direct switch functions are useful for example for light switching or handling similar
time-critical applications (typical output reaction time equals input reaction time as further described in
chapter 4.1).
Note
Direct Switch functions can be configured only for matching input and output, i.e. only for input DiY.X
and output DoY.X (or RoY.X), where each of numbers X and Y (if Y is stated) must be equal. It is not
possible to configure function Direct Switch for one input and more outputs at the same time or for
combination of input and output from different I/O Groups or even for input with different number than
output in the same group.
2.4.5 Digital output connection
Digital outputs (semiconductor, connected as opened collectors) are accessible through DoX (DoY.X),
DOGND and possibly FBD of a screw connector. Each group of digital outputs have common screw
connector DOGND for negative pole connection of DC power supply. Screw connector of DoX serves
for connection of electrical load of external device, which switches against the common potential. State
of each output is signalized by corresponding indication LED diode on the front side of the device.
Note
Depending on software it is possible to configure digital outputs for PWM (Pulse wide modulation)
mode.
The following illustration demonstrates basic connection of digital output.
At some electrical loads connected to Digital output (such as external relay) it is appropriate to make
use of flyback diode which is accessible through FBD screw connector. The following illustration shows
a connection of external relay to digital output using integrated FBD diode.