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4 Programming
4.3 Selection of Temperature Unit
FX
3G
/FX
3U
/FX
3UC
PLC User's Manual - Analog Control Edition
FX3U-4AD-TC-ADP (4-channel Thermocouple Data Input)
K
FX
3U
-4AD-PNK
-ADP
L
FX
3U
-4AD-TC
-ADP
M
PID Instruction
(FNC 88)
•FX3G Series PLC
R: Read / W: Write
4.3 Selection of Temperature Unit
The state of special auxiliary relays decides the TC-ADP's temperature unit as shown in the table below.
To switch the temperature unit, use the following special auxiliary relays:
•FX
3U, FX3UC Series PLC
•FX
3G Series PLC
1. Program Example (For FX3U, FX3UC Series PLC)
Special device
Device number
Description
Attribute Refer to
1st 2nd
Special auxiliary relay
M8280 M8290 Selects the temperature unit R/W Section 4.3
M8281 M8291
Switches the thermocouple type
between type K and type J
R/W Section 4.4
M8282 to
M8289
M8292 to
M8299
Unused (Do not use.) - -
Special data register
D8280 D8290
Channel-1 temperature measurement
data
R
Section 4.5
D8281 D8291
Channel-2 temperature measurement
data
R
D8282 D8292
Channel-3 temperature measurement
data
R
D8283 D8293
Channel-4 temperature measurement
data
R
D8284 D8294
Averaging time for channel 1
(Setting range: 1 to 4095)
R/W
Section 4.6
D8285 D8295
Averaging time for channel 2
(Setting range: 1 to 4095)
R/W
D8286 D8296
Averaging time for channel 3
(Setting range: 1 to 4095)
R/W
D8287 D8297
Averaging time for channel 4
(Setting range: 1 to 4095)
R/W
D8288 D8298 Error status R/W Section 4.7
D8289 D8299 Model code = 10 R Section 4.8
Special auxiliary relay
Description
1st 2nd 3rd 4th
M8260 M8270 M8280 M8290
Selection of temperature unit:
OFF: Centigrade (
°
C)
ON: Fahrenheit (
°
F)
Special auxiliary relay
Description
1st 2nd
M8280 M8290
Selection of temperature unit:
OFF: Centigrade (
°
C)
ON: Fahrenheit (
°
F)
1)To switch the temperature unit to
centigrade (
°
C) for the 1st adapter:
M8001
M8260
Normally OFF
2) To switch the temperature unit to
Fahrenheit (
°
F) for the 2nd adapter:
M8000
M8270
Normally ON