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The common grounds of the inputs 1..5 (see also 2.3.3)
are connected to each other. The common ground for the
sixth input is separate.
The minimal required input current for Ion (the current at
which the diode is conducting and emitting light) is 5 mA.
When the diode is conducting and thus emitting light, the
software will interpret this as a binary '1'.
The maximum allowed current is 10 mA.
2.3.3.2
Digital Outputs
The following diagram shows one output.
Figure 2-8: Digital Output
The common 24V lines of outputs 1..3 are connected to
each other. Also the common 24V lines of the outputs 4..6
are connected to each other.
When the software writes a binary '1' to the output, the
diode will be conducting and so will the transistor. This will
result in an Ion state.
The maximum output current is 18 mA.
2005-12-12
Common
24V
400
Signal Out
When the Inca is reset, the outputs will be in the state Ioff
(the transistor is not conducting).
2.3.3.3
Using the Digital Inputs and Outputs
The following figure gives an example of how the input can
be used.
Inca
Figure 2-9: Using the input
The following figure shows an example of how an output
can be used.
Inca
Figure 2-10: Using the output
2.3.4
Multi-purpose connector
Looking at the back of the Inca the connector in the left
bottom corner is a multi-purpose connector. The
connector, a 9 pole micro-D connector, contains
Signal In
940
24V
15V
Common Ground
Common 24V
400
24V
Signal Out
Page 9
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