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K-21
4 Programming
4.5 Temperature Measurement
FX
3G
/FX
3U
/FX
3UC
PLC User's Manual - Analog Control Edition
FX3U-4AD-PNK-ADP (4-channel Resistance Thermometer Data Input)
K
FX
3U
-4AD-PNK
-ADP
L
FX
3U
-4AD-TC
-ADP
M
PID Instruction
(FNC 88)
4.5 Temperature Measurement
The temperature data input in the PNK-ADP will be stored in the special data registers.
The special data registers that store the temperature data are shown in the following table:
•FX
3U, FX3UC Series PLC
•FX
3G Series PLC
The immediate data or the average data (data averaged in accordance with the specified averaging time) will
be stored in the above data registers as the temperature measurement data.
→ For a detailed description of the averaging time, refer to Section 4.6.
1. Caution regarding temperature measurement
The temperature measurement data are for reading only.
Do not change (rewrite) the current data using the sequence program, indicator, or device monitor of the
programming tool.
2. Program Example (For FX3U, FX3UC Series PLC)
Even if the temperature measurement data is not stored in D100 or D101, data registers D8260 or D8261 can
be directly used in the arithmetic operation instruction or a 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.
Special data register
Description
1st 2nd
D8280 D8290 Stores the channel-1 temperature measurement data.
D8281 D8291 Stores the channel-2 temperature measurement data.
D8282 D8292 Stores the channel-3 temperature measurement data.
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.