Table 4-13 Analog Output Prompts - Honeywell VRX180 User Manual

Programming Function Blocks and Features
Prompt
INPUT SOURCE
INPUT LOW LIMIT
INPUT HIGH LIMIT
OUTPUT LOW LIMIT
OUTPUT HIGH LIMIT
INC SLEW LIMIT
DEC SLEW LIMIT
FAILSAFE
FAILSAFE VALUE
IMPULSE TIME
102

Table 4-13 Analog Output Prompts

Range/Selections
Enter OFF, analog
parameter, number as the
analog output source.
If the AO's input source is a
PID control loop, specify a
high value of 100 and a low
value of 0. For other input
sources, specify limits using
the same units as the AO's
input source.
For CAT, enter any output
range within 0-20 mA
Enter OFF or 0.1 to 999.9
units/minute (units of the
AO's input source).
NONE
UP (Upscale)
DOWN (Downscale)
VALUE
Enter a value between Input
Low Limit and Input High
Limit or analog parameter or
OFF.
OFF or 1
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For a control loop, this is typically set to a control output
(LP# OV). However, it may be directed to any analog value,
such as a calculated value, to retransmit the value to an
external device.
Input limits. (Variable input limits are available by
programming a constant's Destination with HS or LS. See
Program Constants, Section 4.16.)
These limits scale the output to the input limits.
For a CAT output a low limit of 4 and high limit of 20 will
provide a 4-20 mA output range.
Limits the rate of increase or decrease of the analog output.
Value entered is in terms of the AO's input source, not in
terms of the output as defined by OUTPUT LOW LIMIT &
OUTPUT HIGH LIMIT. (Variable slew limits are available by
programming a constant's Destination with IS or DS. See
Program Constants, Section 4.16.)
Select failure action to occur on input signal loss. If VALUE is
selected, enter the value desired in FAILSAFE VALUE
The value at which the output will be held for failsafe. This
value is also the initial output of the loop on "cold start". If
the value is set to OFF, the output will go to 0. Value entered
is in terms of the AO's input source, not in terms of the output
as defined by OUTPUT LOW LIMIT & OUTPUT HIGH LIMIT.
The cycle time (in seconds) for On and Off time of the output.
For example, a time of 150 seconds will cause the output to
be on for 75 seconds and off for 75 seconds when the input
source is at 50%. (Variable impulse time is available by
programming a constant's Destination with IT. Program
Constants, Section 4.16.)
Definition