Data Sheet for Product

Siemens Industry, Inc. Page 3 of 6
l A Human Machine Interface (HMI) port, with a
quick-connect phone jack (RJ-45), uses RS-232
protocol to support operator devices (such as a
local user interface or simple CRT terminal), and
a phone modem for dial-in service capability.
l A USB Device port supports a generic serial
interface for an HMI or Tool connection. The USB
Device port does not support firmware flash
upgrades.
l The program and database information stored in
the UEC RAM memory is battery-backed. This
eliminates the need for time-consuming program
and database re-entry in the event of an extended
power failure.
l The firmware, which includes the operating
system, is stored in non-volatile flash ROM
memory; this enables firmware upgrades in the
field.
l Brownout protection and power recovery circuitry
protect the controller board from power
fluctuations.
l LEDs provide instant visual indication of overall
operation, network communication, and low
battery warning.
Programmable Control with
Application Flexibility
The PXC Compact Series of high performance
controllers provides complete flexibility, which allows
the owner to customize each controller with the exact
program for the application.
The control program for each UEC is customized to
exactly match the application. Proven Powers
Process Control Language (PPCL), a text-based
programming structure like BASIC, provides direct
digital control and energy management sequences to
precisely control equipment and optimize energy
usage.
Global Information Access
The HMI port supports operator devices, such as a
local user interface or simple CRT terminal. Devices
connected to the operator terminal port gain global
information access.
Multiple Operator Access
Multiple operators can access the network
simultaneously. Multiple operator access ensures that
alarms are reported to an alarm printer while an
operator accesses information from a local terminal.
Multiple operators may also access the controller
through concurrent Telnet sessions and/or local
operator terminal ports.
Menu Prompted, English
Language Operator Interface
The UEC includes a simple, yet powerful, menu-
driven English Language Operator Interface that
provides, among other things:
l Point monitoring and display
l Point commanding
l Historical trend collection and display for multiple
points
l Event scheduling
l Program editing and modification via Powers
Process Control Language (PPCL)
l Alarm reporting and acknowledgment
l Continual display of dynamic information
Built-in Direct Digital Control
Routines
The UEC provides stand-alone Direct Digital Control
(DDC) to deliver precise HVAC control and
comprehensive information about system operation. It
receives information from sensors in the building,
processes the information, and directly controls the
equipment. The following functions are available in
the UEC:
l Adaptive Control, an auto-adjusting closed loop
control algorithm, which provides more efficient,
adaptive, robust, fast, and stable control than the
traditional PID control algorithm. It is superior in
terms of response time and holding steady state,
and at minimizing error, oscillations, and actuator
repositioning.
l Closed Loop Proportional, Integral and Derivative
(PID) control.
l Logical sequencing.
l Alarm detection and reporting.
l Reset schedules.
Built-in Energy Management
Applications
The following applications are programmed in the
Unitary Equipment Controller and require simple
parameter input for implementation:
l Automatic Daylight Saving Time switchover