Marathon Computer UNIPRO V3.5 - Manual (Page 2)

Marathon Monitors Inc
.
Unipro 3.5 Process Control 1 Aug. 1997
Description and Applications
The Marathon Monitors Inc. UNIPRO Controller/Programmer
represents the latest technology in microprocessor-based process
control instrumentation. Through flexible PID (Proportional,
Integral, Digital) control along with programmable features, even
the most complex, system can be handled. For a thorough
explanation of PID please refer to Zeigler and Nichols; “Optimum
Settings for Automatic Controllers”, Transactions of ASME, Nov.
1942. Or St. Clair, David W.; Controller Tuning and Control Loop
Performance, a Primer; Straight-Line Control Company, Newark
,Delaware 1989.
The UNIPRO's control actions are based upon input from a
Thermocouple, RTD, Voltage or Current source. The
UNIPRO allows Manual, Automatic, or Programmed control
of a single loop. Its built-in RS-422 computer interface
allows it to be completely supervised by a computer, either
on-site or in some remote location within the plant. The
Programmer can be used, and is strongly recommended, to
allow complete control of temperature or other process
cycles.
The following features have been included to allow use of the
instrument in a wide variety of applications:
Fully site-configurable for single point control from one of three
(3) fully isolated analog input sources, each separately configurable
for thermocouple, RTD, voltage, or current.
Powerful process/logic programmer that can store up to
two-hundred (200) programs, each consisting of nineteen (19)
steps, subroutine calls, test and branch capability, and full access to
all instrument parameters.