Data Sheet for Product

Page 4 of 19 Siemens Industry, Inc.
Modular Equipment Control with
Application Flexibility
The Power MECs are high performance controllers
with complete flexibility to allow the owner to
customize each controller with the exact program for
the application. In addition, each controller can be
sized to meet the hardware requirements for the
application.
The control program for each Power MEC is
customized to exactly match the application. Proven
Powers Process Control Language (PPCL), a BASIC
type programming language provides direct digital
control and energy management sequences to control
equipment precisely and optimize energy usage.
Global Information Access
Each Power MEC is equipped with one RS-232
operator terminal port. This port supports the
connection of a Local User Interface (LUI), simple
CRT terminal, laptop PC, or printer. Devices
connected to the 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.
When using the BACnet/IP ALN option, multiple
operators may also access the controller through
concurrent Telnet sessions and/or local operator
terminal ports.
Menu Prompted, English Language
Operator Interface
The Power MEC has a simple, yet powerful menu
driven English Language Operator Interface that
provides, among other things:
 Point monitoring and display
 Point commanding
 Historical trend collection and display for multiple
points
 Event scheduling
 Program editing and modification via Powers
Process Control Language (PPCL)
 Alarm reporting and acknowledgment
 Continual display of dynamic information
Built-in Direct Digital Control
Routines
The Power MEC provides stand-alone Direct Digital
Control (DDC) to deliver precise HVAC control and
comprehensive information about system operation.
The controller receives information from sensors in
the building, processes the information, and directly
controls the equipment. The following functions are
available:
 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.
 Closed Loop Proportional, Integral and Derivative
(PID) control.
 Logical sequencing.
 Alarm detection and reporting.
 Reset schedules.
Built-in Energy Management
Applications
The following applications are programmed in the
Power MEC and require simple parameter input for
implementation:
 Automatic Daylight Saving Time switchover
 Calendar-based scheduling
 Duty cycling
 Economizer control
 Equipment scheduling, optimization and
sequencing
 Event scheduling
 Holiday scheduling
 Night setback control
 Peak Demand Limiting (PDL)
 Start-Stop Time Optimization (SSTO)
 Temperature-compensated duty cycling
 Temporary schedule override