FP2 Analog Unit
Sample Program for Analog Input
8 - 9
8.4
Temperature Sensor Input Broken Wire Detection
8.4
Temperature Sensor Input Broken Wire Detection
For the input channels of the thermocouple input range and R.T.D (resistance
thermometer device) input range, you can detect broken wires in the input wiring for each
channel.
For the detection of the broken wires, there are two methods of detection: one is
detection performed by the broken-wire detection flags in shared memory, and the other
is detection by the temperature sensor input conversion data (the conversion data is
K20000).
Program example:
When the reading conditions for the analog input ch0 conversion data is to use the
broken-wire detection flag and read to DT0.
F150 READ, K 0 , K 42 , K 1 , WR 0
R9010
R0
F0 MV ,
WX 0 , DT 0
Initial setting
When the analog input
unit is installed at slot 0
ch0 reading
From shared memory address 42
To WR0
Precautions when using broken wire detection for the resistance thermometer
device input wiring
For broken wire detection in the FP2 three-wire resistance thermometer device input
wiring, depending on which wire breaks as shown below, there are situations where the
broken wire detection cannot be performed.
Wire (1) is broken: Broken wire detection is possible
Only (2) wire is broken: Broken wire detection is not possible
Only (3) wire is broken: Broken wire detection is not possible
Wires (2) and (3) are broken: Broken wire detection is possible
V n
COM
I n
Ch n
Input terminals
Three-wire R.T.D (Resistance thermometer device)
(1)
(2)
(3)
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Содержание FP2 -C1A
Страница 23: ...Chapter 3 Wiring Phone 800 894 0412 Fax 888 723 4773 Web www clrwtr com Email info clrwtr com ...
Страница 24: ...FP2 Analog Unit Wiring 3 2 Phone 800 894 0412 Fax 888 723 4773 Web www clrwtr com Email info clrwtr com ...
Страница 37: ...Chapter 5 Initial Settings Phone 800 894 0412 Fax 888 723 4773 Web www clrwtr com Email info clrwtr com ...
Страница 99: ...Chapter 13 Troubleshooting Phone 800 894 0412 Fax 888 723 4773 Web www clrwtr com Email info clrwtr com ...
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Страница 103: ...Chapter 14 Specifications Phone 800 894 0412 Fax 888 723 4773 Web www clrwtr com Email info clrwtr com ...
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