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How to

How to


Products: AS-B, IP-IO , MP-C
Functionalities: Hardware
Product version: 2.0, 2.1, 3.0, 3.1, 3.2, 3.3, 2022, 2023, 2024, 7.0
6/19/2023

Overriding Tristate Outputs

You override a pair of tristate output points to manually control the value of the outputs.

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You use the override display to manually override digital outputs as well as analog outputs.

Warning Warning

Unintended equipment operation

Do not override outputs without knowing the effect.

Failure to follow these instructions can result in death, serious injury, or equipment damage.

There are basically two control modes:

  • Hand mode

  • Auto mode

You place an output in Hand mode when you want to manually override the output. Programs have no effect on the output in this mode. The meaning of the Hand mode for the different output types are described below.

You switch back to Auto mode when you want to remove the manual override. In Auto mode, programs control the output.

The Output Override screen is similar for the different output types. For more information, see Output Override Screen .

 
action_zoom_plus_stroke Output override screen for a digital pulsed output
Figure: Output override screen for a digital pulsed output

The Hand icon

 
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indicates that an output point is manually overridden. For more information, see Icons .

Override Analog Outputs

In Hand mode, you can manually adjust the analog value of an analog output.

Override Digital Outputs

In Hand mode, you can manually activate or deactivate a digital output by selecting one of the following options:

  • Hand On makes the output activated (on).

  • Hand Off makes the output manually deactivated (off).

Override Digital Pulsed Outputs

In Hand mode, you can manually adjust the duty cycle value of a digital pulsed output.

Override Tristate Outputs

In Hand mode, you can manually control a pair of tristate outputs by selecting one of the following override values:

  • On makes the first output active (on).

  • Off makes both outputs inactive (off).

  • -On makes the second output active (on).

 
action_zoom_plus_stroke I/O list screen showing override value -On for tristate output points DO1 and DO2
Figure: I/O list screen showing override value -On for tristate output points DO1 and DO2

Override Tristate Pulsed Outputs

In Hand mode, you can manually adjust the duty cycle value of a pair of tristate pulsed outputs by selecting one of the following override values:

  • [Value] percent makes the first output active (on) in [Value] percent of the pulse period.

  • 0 percent makes both outputs inactive (off).

  • -[Value] percent makes the second output active (on) in [Value] percent of the pulse period.

For example, if you select 10 percent, the first output is active (on) in 10 percent of the pulse period. If you select -10 percent, the second output is active (on) in 10 percent of the pulse period.

 
action_zoom_plus_stroke I/O list screen showing override value 10 percent for tristate pulsed output points DO1 and DO2
Figure: I/O list screen showing override value 10 percent for tristate pulsed output points DO1 and DO2

Warning Warning

Unintended equipment operation

Do not override outputs without knowing the effect.

Failure to follow these instructions can result in death, serious injury, or equipment damage.

To override tristate outputs

  1. With the Home screen displayed, press the Enter key

     
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    .

  2. Highlight OUT .

     
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  3. Press the Enter key

     
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    .

  4. Highlight the first tristate output point, which has an icon with a plus sign (

     
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    or
     
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    ).

     
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  5. Press the Enter key

     
    action_zoom_plus_stroke
    .

  6. Highlight the current override value (Hand value).

     
    action_zoom_plus_stroke

  7. Press the Enter key

     
    action_zoom_plus_stroke
    .

  8. Select one of the following override options:

    • Select On to make the first tristate output point active (on).

    • Select Off to make both tristate output points inactive (off).

    • Select -On to make the second tristate output point active (on).

     
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  9. Press the Enter key

     
    action_zoom_plus_stroke
    .

  10. Highlight HAND .

     
    action_zoom_plus_stroke

  11. Press the Enter key

     
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    to switch to the override mode (Hand mode).

     
    action_zoom_plus_stroke

See Also

  • Override Outputs
  • Keys
  • Home Screen on AS-B Servers
  • Home Screen on MP-C or IP-IO Module
  • I/O Filter Screen
  • I/O List Screen
  • Output Override Screen
  • Icons
  • Removing an Override for an Output