CEMP-E
TI 811-12
18 August 1998
CHAPTER 1
INTRODUCTION
1. PURPOSE. This manual provides a methodology and standards for the design of Utility Monitoring
and Control Systems (UMCS) and for other computer automation systems which sense the physical
environment and control equipment. The methodology described will be used for design of each
system.
2. SCOPE. This manual provides design guidance for new UMCS, expansion of existing UMCS,
upgrade of existing Energy Monitoring and Control Systems (EMCS) to UMCS, and expansion of existing
EMCS. This manual includes guidance for both direct digital control and supervisory control
implementations of UMCS and EMCS.
3. REFERENCES. Appendix A contains a list of references used in this document.
4. UMCS. A UMCS is a utility management system which may be used to achieve utility cost, energy,
and manpower savings for electrical systems, heating, ventilating, and air conditioning, water and
sanitary sewer systems, process equipment, lighting, chillers, boilers and other utility systems and
equipment. The UMCS may also be used to assist in building and maintenance management. The
UMCS employs personal computers or workstations, associated peripherals, microprocessor-based field
equipment panels, instrumentation, control equipment, and applications programs written in high level
computer languages like FORTRAN, C, or PASCAL. The UMCS is configured as a network with control
functions at multiple locations and one or more central points of operator control and supervision. The
UMCS, depending on its configuration, may include a central station, one or more island stations, and
various combinations of peripherals, data transmission systems, field equipment panels, necessary
interfacing controls, and instruments. Field equipment panels include smart field panels, remote terminal
units, universal programmable controllers and unitary controllers which perform field input/output (I/O)
functions. The smart field panel contains a microprocessor and other supporting electronics, and
performs local control functions and applications programs without requiring communications with the
central station or island stations.
5. EXISTING EMCS. An EMCS is an energy management system similar to a UMCS. In the past,
many EMCS have been installed primarily to save energy and reduce electrical demand. The new
terminology, UMCS, reflects the broader use of the system to improve the operation of utility systems and
equipment. Existing EMCS which are operating satisfactorily may be expanded provided that the
required equipment is commercially available and the Government has the necessary documentation and
technical data and computer software licenses. Existing EMCS which are not operating satisfactorily or
for which the Government does not have the necessary documentation and technical data and computer
software licenses can be upgraded to or replaced by UMCS. The EMCS, depending on its configuration,
consists of a central control unit with various combinations of peripherals, data communication systems,
field equipment panels, necessary interfacing controls, and instruments. Field equipment panels, referred
to as field interface devices, contain a microprocessor and other supporting electronics. Field I/O
functions are performed by a multiplexer which is functionally part of the field interface device, although it
may be remotely located. In the non-communicating or "stand-alone" mode, the field interface device
performs certain local control functions and applications programs (utilizing default values for global
information) without requiring communications with the central control unit.
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