Honeywell VRX180 Manuale Utente

Constants can be programmed here and their values edited Online.  Select a constant to program. 

Table 4-52 describes the Constant prompts. See Table 4-2 for additional prompts. 

VALUE OFF, 

analog 

parameter, number 

If a number, the Constant may be altered Online from the Data 
Entry menu.  If a parameter, this parameter can be directed by 
DESTINATION to override certain programmed values. 

INPUT LOW LIMIT 

INPUT HIGH LIMIT 

OFF or number 

Display limits (for when viewing Constant on trend display or on 
bar displays). 

DESTINATION 

 

See Destination defined on next page. 

 NONE 

No 

destination 

 LPn GN LOOPn GAIN1 

 LPn PB LOOPn PROP. BAND #1 

 LPn RS LOOPn RESET #1 

 LPn RA LOOPn RATE #1 

 LPn RB 

LOOPn RATIO BIAS 

 LPn IS LOOPn SP INC SLEW LIMIT 

 LPn DS LOOPn SP DEC SLEW LIMIT 

 LPn HS LOOPn SP HIGH LIMIT 

 LPn LS LOOPn SP LOW LIMIT 

 AOn IS AOn INC SLEW LIMIT 

 AOn DS AOn DEC SLEW LIMIT 

 AOn HS AOn IN HIGH LIMIT 

 AOn LS AOn IN LOW LIMIT 

 AOn IT AOn IMPULSE TIME (type DAT) 

COMM CONSTANT 

Yes/No 

When enabled, any constant writes via modbus communication 
will only be written to the RAM copy of the configuration and not 
to the non volatile flash copy. 

When the unit cold starts, the constant values set up to be 
periodically written via communications will revert back to any 
value that was manually set via the local HMI. The local HMI will 
always write the constant value to the RAM and non volatile flash 
which will be preserved across a power cycle.