Outputs; Testing Outputs And Fuses - adept technology MV User Manual

Chapter 12
Note that the off state current range encompasses the leakage current of the
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.

Outputs

The 32 output channels are arranged in four groups of eight. Each group is
electrically opto-isolated from the other groups and from the VME bus 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
front of the board. 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 of the output pins. This type
of output is considered "sourcing". That is, in the on condition, current flows out
of the output pin.
Each output channel (circuit) should be connected to only one output device.

Testing Outputs and Fuses

Like many solid-state I/O systems, when an output is off, a small leakage current
will try to 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 which 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.
The test signal also can be used to test the state of the power fuse for that
particular group. If the resistance between the test and ground pins is less than 10
KΩ, then the fuse is good. If the reading is greater than 10K
blown and needs to be replaced. Call Adept Customer Service for information on
replacement.
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Adept MV Controller, User's Guide, Rev. B

Outputs

Ω
then the fuse is
195