Programming Function Blocks and Features

Table 4-13 Analog Output Prompts

 

Prompt

 

 

Range/Selections

 

 

Definition

 

 

INPUT SOURCE

 

 

Enter OFF, analog

 

 

For a control loop, this is typically set to a control output

 

 

 

 

 

parameter, number as the

 

 

(LP# OV). However, it may be directed to any analog value,

 

 

 

 

 

analog output source.

 

 

such as a calculated value, to retransmit the value to an

 

 

 

 

 

 

 

 

external device.

 

 

INPUT LOW LIMIT

 

 

If the AO's input source is a

 

 

Input limits. (Variable input limits are available by

 

 

 

 

 

PID control loop, specify a

 

 

programming a constant's Destination with HS or LS. See

 

 

 

 

 

high value of 100 and a low

 

 

Program Constants, Section 4.16.)

 

 

 

 

 

value of 0. For other input

 

 

 

 

 

INPUT HIGH LIMIT

 

 

sources, specify limits using

 

 

 

 

 

 

 

 

the same units as the AO's

 

 

 

 

 

 

 

 

input source.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OUTPUT LOW LIMIT

 

 

For CAT, enter any output

 

 

These limits scale the output to the input limits.

 

 

 

 

 

range within 0-20 mA

 

 

For a CAT output a low limit of 4 and high limit of 20 will

 

 

OUTPUT HIGH LIMIT

 

 

 

 

 

 

 

 

 

 

 

 

provide a 4-20 mA output range.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

INC SLEW LIMIT

 

 

Enter OFF or 0.1 to 999.9

 

 

Limits the rate of increase or decrease of the analog output.

 

 

 

 

 

units/minute (units of the

 

 

Value entered is in terms of the AO's input source, not in

 

 

 

 

 

AO's input source).

 

 

terms of the output as defined by OUTPUT LOW LIMIT &

 

 

 

 

 

 

 

 

OUTPUT HIGH LIMIT. (Variable slew limits are available by

 

 

DEC SLEW LIMIT

 

 

 

 

 

 

 

 

 

 

 

 

programming a constant's Destination with IS or DS. See

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Program Constants, Section 4.16.)

 

 

 

 

 

 

 

 

 

 

FAILSAFE

 

NONE

 

 

Select failure action to occur on input signal loss. If VALUE is

 

 

 

 

 

UP (Upscale)

 

 

selected, enter the value desired in FAILSAFE VALUE

 

 

 

 

 

 

 

 

 

 

 

 

 

DOWN (Downscale)

 

 

 

 

 

 

 

 

VALUE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FAILSAFE VALUE

 

 

Enter a value between Input

 

 

The value at which the output will be held for failsafe. This

 

 

 

 

 

Low Limit and Input High

 

 

value is also the initial output of the loop on "cold start". If

 

 

 

 

 

Limit or analog parameter or

 

 

the value is set to OFF, the output will go to 0. Value entered

 

 

 

 

 

OFF.

 

 

is in terms of the AO's input source, not in terms of the output

 

 

 

 

 

 

 

 

as defined by OUTPUT LOW LIMIT & OUTPUT HIGH LIMIT.

 

 

IMPULSE TIME

 

 

OFF or 1

 

 

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.)

 

102

Video Recorder – User Manual

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Honeywell VRX180 user manual Analog Output Prompts