27
Low-side digital outputs
Instruction book, IQAN
Low-side digital outputs
The low-side digital outputs may control relays and on/off valves.
For the maximum load per output see Appendix A.
Connecting loads to low-side digital outputs
Connecting of loads to the low-side digital outputs such as on/off valves is done by
using the DOUT(LS) positions and one or more DOUT channels as supply.
Protection against voltage transients
A clamping diode must be placed between the source and low-side digital output, as
close to the load as possible. This protects the output against high voltage transients.
For example, use diode: 1N5408 (3A/1000V).
Depending on the load, other clamping diodes might be used instead.
W
ARNING
Loads on DOUT with Low-Side switch (DOUT[LS]) must always be controlled on the
high-side by connection to a digital output with High-Side switch (DOUT-X) for safe
function. The total sum of current supplied to the loads controlled by a number of
DOUT[LS] is limited to 2000mA.
Remember that these flexible I/O pins must be configured in pairs of the same type,
VIN, DIN or DOUT-LS.
EXAMPLE
Connect the on/off valves to the low-side digital outputs using a pair of the
DOUT(LS) positions, and the DOUT-X, as supply.
A clamping diode must be placed as close to the load as possible, see figure below.
Connecting loads to the low-side digital outputs.
d2
DOUT-X
DOUT(LS)
DOUT(LS)
d1
IQAN module
