Honeywell VRX180 user manual Program Discrete Inputs, Discrete Input Prompts

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.

Table 4-14 Discrete Input Prompts

Prompt	Range/Selections		Definition
ACTION STATE	NORMAL, INVERT		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).
DELAY TIME	Number of seconds	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.
EVENT ENABLE	NONE, RISING, FALLING,		Determines whether changes in DI’s status can be recorded
	BOTH		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

104 Video Recorder – User Manual