Extended I/O Outputs; Testing Extended I/O Outputs; Extended I/O Outputs Diagnostic Signal For Thermal Overload - adept technology MV User Manual

Chapter 5


The off state current range exceeds the leakage current of
extended DIO outputs. This guarantees that the inputs will not be
turned on by the leakage current from the outputs. This is useful in
situations where the inputs are connected to the outputs to monitor
the state of the outputs.

Extended I/O Outputs

The 32 output channels are arranged in four groups of eight. Each group is
isolated from the other groups and is optically isolated from the CIP circuitry. The
eight outputs within each group share a common power supply and a common
ground.
The outputs are accessed through the two 44-pin D-sub output connectors on the
rear of the CIP. Each connector provides access to two output groups. Each group
requires 19 pins: 8 output signals, 1 test signal, 9 power supply (all tied together),
and 1 power supply ground reference. When an output is on, current will flow in
through the power supply pins and out through the output pins. This type of
output is considered sourcing, that is, in the "on" condition, current flows out of
the output pin. See

Testing Extended I/O Outputs

Like many solid-state I/O systems, when an output is off, a small leakage current
will flow out of the output. This will raise the potential of the output to the power
supply voltage level if there is no load. With a load connected, the output will
function normally. However, if you need to test the output with a voltmeter with a
load disconnected, you will get a false reading. The test signal provides a bias that
can be used as a pull-down resistor for system-level debugging. When this is
connected to an output, the output will assume the ground potential when it is
off.

Extended I/O Outputs Diagnostic Signal for Thermal Overload

The integrated circuits that provide the output transistors for the extended digital
outputs incorporate a diagnostic indicator that indicate when a thermal overload
shutdown has occurred, most likely the result of a short circuit condition. When
the indicator is active, the associated output can not be activated. All the
diagnostic indicators for the extended digital outputs have been wire-or'ed
together to provide a software indicator that can be read by the V
real-valued function, see the
responding, use the STATE() function to determine if a hardware shutdown is
present. Note that the indicator is active only when the output that has been
"shutdown" has been asserted. For example, when a V+ SIGNAL 33 instruction is
issued.
122
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for details on typical digital output wiring.
+
V Language Reference
Adept MV Controller User's Guide, Rev. B
Extended Digital I/O Signals
+
STATE()
Guide. If an output is not