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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