Honeywell VRX180 Manuale Utente

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. 

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, 
BOTH 

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