Mitsubishi Electric MELSEC iQ-R Series User Manual page 37

■Measured temperature value after the recovery
A correct measured temperature value is stored in the buffer memory area at the next temperature conversion after Normal
(0) is stored in 'Disconnection detection flag' (Un\G41). For averaging processing, a correct measured temperature value is
stored in the buffer memory area after Normal (0) is stored in 'Disconnection detection flag' (Un\G41) and the averaging
process cycle has elapsed.
Detection cycle
Disconnection detection is executed every sampling cycle.
Conversion setting at disconnection detection
A value stored in 'CH1 Measured temperature value' (Un\G400) at the time of the disconnection detection can be specified by
setting 'CH1 Conversion setting at disconnection detection' (Un\G531). This enables disconnection detection only by checking
'CH1 Measured temperature value' (Un\G400), without checking 'Disconnection detection signal' (XC). The default value of
'CH1 Conversion setting at disconnection detection' (Un\G531) is Downscale (1). Change the setting value if necessary.
Conversion setting at disconnection detection
Upscale (0)
Downscale (1)
Any value (2)
Value just before disconnection (3)
■Upscale, downscale
An upscale value (upper limit value + 5% of input rage) or a downscale value (lower limit value - 5% of input rage) of the set
input range is stored in 'CH1 Measured temperature value' (Un\G400) at the time of the disconnection detection. The following
tables list a value stored in 'CH1 Measured temperature value' (Un\G400) at the disconnection detection, when the upscale or
downscale is selected.
• Thermocouple input module
Input range
K thermocouple
E thermocouple
J thermocouple
T thermocouple
B thermocouple
R thermocouple
S thermocouple
N thermocouple
• RTD input module
Input range
Pt100 (-200 to 850)
Pt100 (-20 to 120)
Pt100 (0 to 200)
JPt100 (-180 to 600)
JPt100 (-20 to 120)
JPt100 (0 to 200)
Ni100 (-60 to 250)
Pt50 (-200 to 650)
Operation performed when disconnection is detected
An upscale value of the presently set input range (upper limit value + 5% of input rage) is stored in
'CH1 Measured temperature value' (Un\G400).
A downscale value of the presently set input range (lower limit value - 5% of input rage) is stored
in 'CH1 Measured temperature value' (Un\G400).
A value set in 'CH1 Conversion setting value at disconnection detection' (Un\G532) is stored in
'CH1 Measured temperature value' (Un\G400).
'CH1 Measured temperature value' (Un\G400) holds a value just before the disconnection is
detected.
Temperature measuring range
-270 to 1370
-270 to 1000
-210 to 1200
-270 to 400
0 to 1820
-50 to 1760
-50 to 1760
-270 to 1300
Temperature measuring range
-200 to 850
-20 to 120
0 to 200
-180 to 600
-20 to 120
0 to 200
-60 to 250
-200 to 650
Downscale
-352.0
-333.5
-280.5
-303.5
-91.0
-140.5
-140.5
-348.5
Downscale
-252.5
-27.0
-10.0
-219.0
-27.0
-10.0
-75.5
-242.5
1.7 Disconnection Detection Function
Upscale
1452.0
1063.5
1270.5
433.5
1911.0
1850.5
1850.5
1378.5
Upscale
902.5
127.0
210.0
639.0
127.0
210.0
265.5
692.5
1 FUNCTIONS
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