44
4 FUNCTIONS
4.8 Disconnection Detection Function
■
Case of Disable (1)
‘Disconnection detection flag' (Un\G41), 'Disconnection detection signal' (Un\G69, b6), and the ALM LED hold the status at
the time of the disconnection detection. To return to the normal status, make a recovery from disconnection of all the
channels, and turn off
→
on
→
off 'Error clear request' (Un\G70, b15).
Detection cycle
Disconnection detection is executed every sampling cycle.
Conversion setting at disconnection detection
A value stored in 'CH1 Digital output value' (Un\G400) at the time of the disconnection detection can be specified by setting
'CH1 Conversion setting at disconnection detection' (Un\G534). This enables disconnection detection only by checking 'CH1
Digital output value' (Un\G400), without checking 'Disconnection detection signal' (Un\G69, b6). The default value of 'CH1
Conversion setting at disconnection detection' (Un\G534) is Downscale (1). Change the setting value if necessary.
■
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 Digital output value' (Un\G400) at the time of the disconnection detection. The following tables
list a value stored in 'CH1 Digital output value' (Un\G400) at the disconnection detection, when the upscale or downscale is
selected.
• Case of thermocouple
• Case of resistance temperature detector
Conversion setting at
disconnection detection
Operation performed when disconnection is detected
0: Upscale
An upscale value of the presently set input range (upper limit value + 5% of input rage) is stored in 'CH1 Digital output
value' (Un\G400).
1: Downscale
A downscale value of the presently set input range (lower limit value - 5% of input rage) is stored in 'CH1 Digital
output value' (Un\G400).
2: Any value
A value set in 'CH1 Conversion setting value at disconnection detection' (Un\G532) is stored in 'CH1 Digital output
value' (Un\G400).
3: Value just before disconnection
'CH1 Digital output value' (Un\G400) holds a value just before the disconnection is detected.
Input range
Temperature measuring range Down Scale
Up Scale
K
Centigrade (
)
-270 to +1370
-352.0
1452.0
Fahrenheit (
)
-454 to +2498
-601.6
2645.6
J
Centigrade (
)
-210 to +1130
-277.0
1197.0
Fahrenheit (
)
-346 to +2066
-466.6
2186.6
T
Centigrade (
)
-270 to +400
-303.5
433.5
Fahrenheit (
)
-454 to +752
-514.3
812.3
B
Centigrade (
)
0 to 1710
-85.5
1795.5
Fahrenheit (
)
32 to 3110
-121.9
3263.9
R
Centigrade (
)
-50 to +1710
-138.0
1798.0
Fahrenheit (
)
-58 to +3110
-216.4
3268.4
S
Centigrade (
)
-50 to +1710
-138.0
1798.0
Fahrenheit (
)
-58 to +3110
-216.4
3268.4
Input range
Temperature measuring range Down Scale
Up Scale
Pt100
Centigrade (
)
-200 to +850
-252.5
902.5
Fahrenheit (
)
-328 to +1562
-422.5
1656.5
Ni100
Centigrade (
)
-60 to +250
-75.5
265.5
Fahrenheit (
)
-76 to +482
-103.9
509.9
Содержание MELSEC iQ-F
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