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Chapter 3
Configuring and Installing Your Module
Response to External Fault
Keying
3 4
encoders. This is the same as selecting "high true" or "low true" inputs
from the Gray encoder.
Configuration plug E15 is factory-set in the right position. It gives an
increased count when the encoder rotates clockwise when looking at the
shaft. If your encoder shows a decreased count, change the plug to the
left position.
If your Gray
encoder has:
12 bits
less than 12 bits
This configuration plug does not affect BCD or binary encoders.
Selecting State of Outputs Upon Loss of Input Power
Use configuration plug E1 on the right board to choose the state of the
outputs if the module loses input power. The plug is factory-set for the
outputs to turn off if input power is lost (up position). If you want the
outputs to remain in their state at loss of input power, set the plug to the
down position.
Except for downloading programs or commands and reporting status, the
module operates independent of the host processor. In the event of a
processor or I/O communications fault, the module either continues
operation or its outputs turn off, depending on how you set the last state
switch of the chassis in which you place the module.
If you set the last state switch to turn outputs off, the module's outputs are
turned off.
If you set the last state switch to hold outputs in last state, the module
continues operating.
Plastic keying bands are shipped with each I/O chassis. These bands
ensure that only a selected type of module can be placed in a particular
and E15 is in
this position
right
an increased count
left
a decreased count
right
an increased count
left
a decreased count starting with 4,095
the encoder
shows:
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