App.-1
Appendix
Abbreviations are used in the descriptions, tables, and illustrations of this manual. The main abbreviations are
explained below.
Symbol
% FS (% full scale)
Full scale error
The full scale is the input range of a controller or recorder. The control or
display accuracy of a device that has a specified measurement range setting for
temperature, flow rate, etc., is expressed with this term. The range of error is
obtained by multiplying the range specified for the device by this percentage.
A
AT (auto-tuning)
A function to automatically calculate the optimum value of the PID control
parameters (P, I, D).
C
CJ (cold junction)
Cold junction compensation
A reference junction compensation in which the temperature of the reference
junction is set to 0 °C.
CPL (Controller Peripheral Link)
CPL communication, CPL communication protocol
A type of communication, or a communication protocol, that can be used with
Azbil’s controllers, etc. Used to connect to a device and read and write its internal
data.
CT (current transformer)
Used to detect the current applied to a heater. Heater burnout, relay short circuit,
etc., can be monitored.
D
D (derivative)
D action (derivative action)
A control action that gives a controlled variable proportional to the speed at which
the process value deviates from the set point. It makes a large correction while the
deviation is small. It is not used alone but works in combination with P or PI action.
To Next Page
Loading...
