Data Sheet for Product

Siemens Building Technologies, Inc. Page 3 of 8
Status LEDs indicate 24 Vac supplied from the power
supply and 24 Vdc supplied to the input/output point
board.
•
Controller Board
The controller board is a microprocessor-based multi-
tasking platform for program execution and
communications with the I/O point board and with
other Power MECs and field panels over the ALN.
The 12xx and 13xx controllers can also support
analog or digital point expansion modules, which
provide for point expansion capability to match the
application requirements. The controller board scans
field data, optimizes control parameters and manages
operator requests for data.
An RS-232 operator terminal port with a quick
connect phone jack (RJ-11) is included with each
controller board for operator devices such as a Local
User Interface (LUI), simple CRT terminal, laptop PC,
or printer. In addition, the MEC 13xx controller
supports an RS-232 quick connect phone jack (RJ-
45) for use with a phone modem for APOGEE
autodial stand-alone network capability.
The 12xxF and 13xxF controllers support 3 FLN
trunks for communications with a total of 96 FLN
devices.
The program and database information stored in the
Power MEC 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. When battery replacement is necessary, the
controller board illuminates a “battery low” status LED
and can send an alarm message to selected printers
or terminals.
The firmware including the operating system is stored
in non-volatile flash ROM memory. Flash ROM is
easily upgradeable at the job site. This provides for
ease of upgrade, as new firmware updates are made
available.
Brownout protection and power recovery circuitry
protect the controller board from power fluctuations.
Enclosure Assemblies
The enclosure assembly houses both electronic and
pneumatic components. The locking enclosure
includes a perforated panel for mounting of the Power
MEC, Point Expansion Module and other electronic or
pneumatic components. The enclosure is available in
two sizes to allow the enclosure to match the
requirements of the installation:
• Small - to house a controller or two point
expansion modules
• Large - to house a controller and two point
expansion modules or four point expansion
modules
The enclosures are constructed of metal to
accommodate secure conduit fittings and protect
components against electrical transients. The
enclosure allows space for easy wire routing and
terminations.
Figure 3. Two sizes of Power Modular Equipment Controller
enclosures.
Service Box
Two optional service boxes are available for mounting
in the enclosure. One service box provides step down
power from 115V to 24V, two Class 2 24 Vac power
terminations (100 VA for Power MEC and Point
Expansion Modules, and 60 VA for actuators), and
two un-switched 115 Vac outlets to power accessory
devices such as modems and Portable Operator’s
Terminals. A second service box provides step down
power from 230V to 24V and Class 2 24 Vac power
terminations.