Input / Output Control
DIOM Input / Output ports are read by Orbit
Read1
and controlled by Orbit
Preset
. (Refer to Communications with
DIOM).
In the example below, Port 0 (bit 0) is driving a load and Port 1 (bit 1) is an input to a switch (All other Ports are not
used in this example).
All example input states are read back correctly except the last where Port 0 (bit 0) output driver is switched ON
causing a false input state to be read by the Port 0 input buffer.
Input and output ports are internally connected. For each I/O line, the output driver must be OFF (bit=1) before it can
be used as an input.
Note however that this last condition is an example of the DIOM monitoring its own output state.
5.0:
Application - Software
5.0 Application - Software
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Manual No. 502237 Issue 2
DIOM 502237_Issue 2.qxd 20/07/2005 15:38 Page 20
