1
. Introduction
1.2. Terms and definitions
14
Isolated Thermocouple Input Module TC4S User's Guide
R200
Honeywell
September 2010
1.2 Terms and definitions
Analog quality – A
Analog quality refers to the constantly changing voltage, current, temperature, speed,
pressure, and flow.
For instance, temperature is constantly changing over time as seen in the following
figure. The changing temperature can be treated as a digital value in the PLC by using
resistance temperature detector (RTD) input module.
Digital quality – D
Digital quality refers to discrete changes in voltage, current, temperature, velocity,
pressure, and flow over a period of time as illustrated in the following figure. For
instance, ON/OFF signal is represented as digital quality of 0 and 1.
Содержание TC4S
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