36
Connecting Outputs
Multi provides four fixed outputs and other eight lines can be freely
configured as Inputs or Outputs; when such lines are configured as
Outputs these are called: Configurable outputs.
Multi outputs are provided with open collector transistors.
Using the open collector directly (i.e. to connect an external relay), the
current must not exceed 50mA; when the load exceeds such value
is mandatory to use an external power supply.
In the following section we give the connection schematics in the case
of external relay powered directly from Multi and with relay powered
from an external power supply for both fixed output and for
configurable ones.
Note: Use 12VDC relay - max coil current = 50mA each. In this case
it’s mandatory to connect a 1N4004 diode as shown into schematics.
Multi can also be equipped with optional VMA-06 or VMA-07 relay
plugs-in (see chapter USING RELAYS PLUGS-IN (VMA-06, VMA-07)
on page 44 for these approach); to inform the board about the use of
external relays or Multi relay plugs-in on the board are present several
jumpers. Every schematic reports the relating setting of the jumpers.
The default jumpers’ configuration of Multi board (factory setting) is the
one used for external relays.
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