Honeywell UMC800 Reference Guide

Function Blocks
3/99 Function Block Reference Guide 173
2.57 RTMR Function Block
Description
The
RTMR
label stands for
Resettable Timer
. This block is part of the
Counters/Timers
category. It
looks like this graphically on the Control Builder.
Function
The Resetable Timer block has the following attributes:
•
Provides increasing or decreasing timing base on an enable input.
•
Increasing time from 0 or preload value.
•
Decreasing time from preset or preload value.
•
Increasing time provides digital output upon reaching Preset
•
Decreasing time provides digital output upon reaching zero
•
Reset input sets increasing timer to zero.
•
Reset input sets decreasing timer to preset value.
•
Preset value may be internal, or remote via a dedicated input
•
Inc./Dec. selection is via digital input.
Inputs
RST = Off to On transition, Reset
EN = ENABLE ON = run; timer is counting
OFF = Timer is stopped; output (TIMER) held at last value
TIM_DN = ON (time down); OFF (time up)
RPRES = Remote Preset (0.0 – 99999.9) If Time-up, RPRES represents
Stop
value in seconds
If Time -down, RPRES represents
Start
value in seconds
PREL = Preload (0.0 – 99999.9) If Time-up, PREL represents
Start
value in seconds
If Time-down, PREL represents
Start
value in seconds
Outputs
TIME = current value of time in seconds
Out = Output (Digital) turned ON when Preset value is reached or time reaches 0,
depending on TIMDN input status

Honeywell UMC800 Specifications

General

Brand	Honeywell
Model	UMC800
Category	Controller
Language	English