E-16
4 Programming
4.4 Temperature Measurement
FX
3U
/FX
3UC
Series PLC User's Manual - Analog Control Edition
FX
3U
-4AD-PT-ADP (4-channel Platinum Resistance Thermometer Data Input)
4.4 Temperature Measurement
The temperature data input in PT-ADP will be stored in the special data registers.
The special data registers that store the temperature data are shown in the following table:
The immediate data or the average data (data averaged in accordance with the specified number of
averaging time) will be stored in the above data registers as the temperature measurement data.
→ For a detailed description of the number of averaging time, refer to Section 4.6.
1. Caution regarding temperature measurement
The special data registers for temperature measurement data is for reading only.
Do not change (rewrite) the current data using the sequence program, indicator, or device monitor of the
programming tool.
2. Example of program
Even if the temperature measurement data is not stored in the D100 or the D101, the D8260 or the D8261
can be directly used in the arithmetic operation instruction or PID instruction.
Special data register
Description
1st 2nd 3rd 4th
D8260 D8270 D8280 D8290 Stores the channel-1 temperature measurement data.
D8261 D8271 D8281 D8291 Stores the channel-2 temperature measurement data.
D8262 D8272 D8282 D8292 Stores the channel-3 temperature measurement data.
D8263 D8273 D8283 D8293 Stores the channel-4 temperature measurement data.
M8000
Normally
ON
FNC 12
MOV
D8260 D100
FNC 12
MOV
D8261 D101
Stores the channel-1 temperature measurement
data of the 1st analog special adapter in the D100.
Stores the channel-2 temperature measurement
data of the 1st analog special adapter in the D101.
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