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Programming Function Blocks and Features
Video Recorder – User Manual 147
4.16 Program Constants
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.
Table 4-52 Constant Prompts
Prompt Range/Selections Definition
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.