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Digital
Output
Signals
Digital output
signals
DO1 and DO2 indicate
the controller
mode
(auto/manual
and remote/local)
to an external
destination.
These two
outputs
are optically
isolated.
The figure shows an example
of the
connection
for an external
load with an external
supply.
If an inductive
load such as a relay coil, is
connected
to a digital output, the coil must be
shunted
by a diode (lN4003
or similar).
Observe
proper
polarity
and wire the diode as close as
possible
to the coil.
Controllers
powered
from 24 Vdc sources
have a
current
limit of 250 mA on each output.
Change 2 - Ju/y 1992
uM6.1:DPFl900:9747
Digital output
signals
(DO3 thru D06) are open-collector
transistor
outputs
as shown in the figure. The 24 V is directly
connected
to
these outputs.
However,
each output can have its own separate
supply.
The 24 Vdc terminals
can supply a maximum
external
load of 100 mA when powered
from 110,
120,220
or 240 Vat power sources.
This supply
is
intended
to power transmitters
or relays
connected
to the discrete
outputs.
The 100 mA
limit applies
only to ac powered
units. No internal
load, including
the two analog
outputs,
need be
included
in the 100 mA total.
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