CLS200 Series User’s Guide
174
EPROM
Erasable Programmable, Read-Only Memory
inside the controller.
Error
The difference between the correct or desired
value and the actual value.
F
Fahrenheit
The temperature scale that sets the freezing
point of water at 32°F and its boiling point at
212°F at standard atmospheric pressure. The
formula for conversion to Celsius:
°C = 5/9 (°F - 32).
Failed Sensor Alarm
Warns that an input sensor no longer produces
a valid signal. For example, when there are
thermocouple breaks, infrared problems or
resistance temperature detector (RTD) open or
short failures.
Filter
Filters are used to handle various electrical
noise problems.
Digital Filter (DF)
A filter that slows the response of a system
when inputs change unrealistically or too fast.
Equivalent to a standard resistor-capacitor
(RC) filter.
Digital Adaptive Filter
A filter that rejects high frequency input signal
noise (noise spikes).
Heat/Cool Output Filter
A filter that slows the change in the response
of the heat or cool output. The output
responds to a step change by going to
approximately 2/3 its final value within the
numbers of scans that are set.
Frequency
The number of cycles over a specified period
of time, usually measured in cycles per second.
Also referred to as Hertz (Hz). The reciprocal is
called the period.
G
Gain
The amount of amplification used in an electrical
circuit. Gain can also refer to the Proportional (P)
mode of PID.
Global Alarm
Alarm associated with a global digital output
that is cleared directly from a controller or
through a user interface.
Global Digital Outputs
A digital output that alerts the operator when an
alarm occurs.
Ground
An electrical line with the same electrical
potential as the surrounding earth. Electrical
systems are usually grounded to protect
people and equipment from shocks due to
malfunctions. Also referred to a “safety ground”.
H
Hertz (Hz)
Frequency, measured in cycles per second.
High Deviation Alarm
Warns that the process is above setpoint, but
below the high process alarm setpoint. It can be
used as either an alarm or control function.
High Power
(Relative to the CLS200 power.) Any voltage
above 24VAC or VDC and any current level
above 50mA AC or mA DC.
High Process Alarm
Indicates that a process value has risen above
the high process alarm setpoint. It can be used
as either an alarm or control function.
High Process Variable
See Process Variable (PV).
High Reading
An input level that corresponds to the high
process value. For linear inputs, the high reading
is a percentage of the full scale input range. For
pulse inputs, the high reading is expressed in
cycles per second (Hz).
