User`s guide

Overview
UMC800 Overview
Release E UMC800 Control Builder User’s Guide 3
1/01
When Ratio control is applied, a ratio and bias adjustment are provided. When used with the supplementary
loop control blocks, digital inputs may be used to set control mode, select the setpoint source, change
control action, and perform other discrete actions.
A status block provides digital outputs to facilitate integrating loop operation with other functions in the
controller.
When configured for dual output (heat/cool), each output may be directed to different output types, for
example: current, time proportioning, etc. Two sets of tuning constants for heating and cooling are also
provided.
Accutune
Honeywell’s Accutune II
TM
automatic tuning algorithm with Fuzzy Logic Overshoot Suppression is
available for each loop of the controller. Initiated on command from the operator interface or through a
digital input to the loop, this easy to operate feature optimizes control performance with a minimum of
process disturbance.
Logic
The controller offers up to 96 digital inputs or outputs and uses digital function blocks to perform Boolean
logic operations and sequences. The digital function blocks may be programmed to operate on a fixed 100-
millisecond update rate or on the slower analog measurement scan rate as determined during configuration.
Alarms
Alarm monitoring may be assigned to the digital status of analog alarm blocks, or other digital block status.
Each PID loop also provides up to four alarms of various types. Alarm flexibility is also expanded using the
analog alarm block, which allows selective set-up of alarm hysteresis, deviation alarms, on delay, selective
latching, and a disable input to control when the alarm is active.
Active alarm indication is provided on all operator displays and alarm group displays are provided to view
and acknowledge active alarms. An alarm detail display is provided for each alarm point which indicates
the time and data of last alarm occurrence and offers 40 characters of user specified text for alarm actions
or notes. Up to 120 alarms may be configured and applied to loop alarms or digital tags.
Function block configuration
The UMC800 uses function block configuration architecture to develop control strategies for both analog
and digital operations. A function block may represent a physical input or output, several physical inputs or
outputs, an internal calculation, or an internal function such as a PID algorithm. All configuration is done
using the "Control Builder" software.
A summary of the assortment of greater than 75 standard UMC800 function block algorithm types follows.
Typically, a function block algorithm type may be used any number of times up to the limit of 250 blocks.
Some of those with specific limits are:
• PID and ON/OFF control loops and associated support blocks— eight or sixteen maximum
• Setpoint programmer blocks and associated support blocks—four maximum
• Setpoint Scheduler blocks and associated support blocks—one maximum
• Time proportioning output blocks—sixteen maximum
• Pushbutton blocks—four maximum
• 4 Selector Switch blocks—four maximum
• Modbus Slave blocks—sixteen maximum