Program Discrete Inputs; Table 4-14 Discrete Input Prompts - Honeywell VRX180 User Manual

Programming Function Blocks and Features

4.10 Program Discrete Inputs

Discrete Input function blocks are controlled by the on/off status of the input hardware. The output of
the function block, DIn OS, reflects the status of the associated input hardware. This output DIn OS can
be connected to other function blocks' input parameters to trigger actions such as starting a profile or
selecting a control loop's Set point #1 or Set point #2, among many other possibilities.
The Program Discrete Input menu item will appear if a DI/DO card is installed.
Select a discrete input to program, then program the prompts in Table 4-14. See Table 4-2 for
additional prompts.
Prompt
ACTION STATE NORMAL, INVERT
DELAY TIME Number of seconds
EVENT ENABLE NONE, RISING, FALLING,
BOTH
104

Table 4-14 Discrete Input Prompts

Range/Selections
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Determines whether the input will be normally closed or
normally open when ON(1). To select closed when ON (1),
enter NORMAL (not inverted). To select closed when OFF(0),
enter INVERT (inverted).
When the DI is placed in its ON(1) state, the DI function will
wait for the specified delay time before indicating the ON(1)
condition as an output. If the DI "ON" state changes before
the delay time expires, no ON output will be indicated.
Determines whether changes in DI's status can be recorded
as events in data storage.
NONE - status changes are not stored
RISING - OFF(0)-to-ON(1) changes can be stored
FALLING - ON(1)-to-OFF(0) changes can be stored
BOTH - Both changes can be stored
Definition