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3
SPECIFICATIONS
3.2 Function List
3.2.1 Temperature conversion system
3 - 7
1
OVERVIEW
2
SYSTEM
CONFIGURATION
3
SPECIFICATIONS
4
PROCEDURES AND
SETTINGS BEFORE
SYSTEM OPERATION
5
UTILITY PACKAGE
(GX CONFIGURATOR-TI)
6
PROGRAMMING
7
ONLINE MODULE
CHANGE
8
TROUBLESHOOTING
(3) Primary delay filter
By a preset time constant, measured temperature value whose excessive noise has
been smoothed is output.
The degree of smoothness depends on the time constant.
Time constant is the time required for measured temperature value to reach 63.2% of
a steady-state value.
The relational expression between time constant and measured temperature value is
shown below.
[When n=1
*1
]
Y
n = 0
[When n=2]
[When n 3]
* 1 Conversion completion flag turns ON (changes to "1") when n 2.
Setting range of time constant is 320 to 5000ms.
If a value outside the setting range is set, an error (error code: 32 ) occurs.
Yn: Current measured temperature
value
yn: Measured temperature value
before smoothed
Yn-1: Preceding measured
temperature value
yn-1: Preceding measured
temperature value before
smoothed
n: Number of sampling times
t:
Conversion period (320ms)
TA: Time constant (320 to 5000ms)
Yn = yn-1 +
t
(y
n - yn-1)
t + TA
t + TA
(yn - Yn-1)
Y
n = Yn-1 +
t