Ch Input Signal Error Detection Setting Value (Buffer Memory Addresses 138 To 141: Un\G138 To Un\G141) - Mitsubishi Q64AD-GH User Manual

3 SPECIFICATIONS
3.4.20 CH input signal error detection setting value (buffer memory addresses 138 to 141:
Un\G138 to Un\G141)
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(1) Set the value, at which the error of the entered analog value will be detected, on a
channel basis.
(2) To make the setting valid, the Operating condition setting request (Y9) must be
turned ON/OFF. (Refer to Section 3.3.2.)
(3) The setting range is 0 to 250 (0 to 25.0%). Set the value in 0.1% increments.
Example) When setting the input signal error detection setting value to 15%, store
150 into the buffer memory.
(4) The input signal error detection upper and lower limit values depend on the used
range.
The expressions for calculating the input signal error detection upper and lower
limit values are as follows.
Input signal error detection upper limit value
= gain value of corresponding range + (gain value of corresponding range - offset
value of corresponding range)
Input signal error detection lower limit value
= lower limit value of corresponding range
- offset value of corresponding range)
When the user range setting is used, the lower limit value is as follows.
Example) Lower limit value when the gain value setting is 8V and the offset
value setting is 4V
For the user range setting (uni-polar) of the Q64AD-GH or the user
range setting of the Q62AD-DGH, the offset value is the lower limit
value.
Gain value
Offset value
(Lower limit value)
For the user range setting (bi-polar), the analog value corresponding
to the digital value of -64000 is the lower limit value.
Offset value
Lower limit value
(5) Refer to Section 3.2.3 for details of the input signal error detection function.
POINT
(1) Set the input signal error detection upper limit value to less than 25mA.
If the setting is 25mA or more, the error may not be detected.
(2) For the Q62AD-DGH, set the input signal error detection lower limit value to
0mA or more.
If it has been set to less than 0mA, the error may not be detected.
(setting value/1000)
8V
4V
Gain value 8V
4V
0V
MELSEC-Q
+ (gain value of corresponding range
(setting value/1000)
64000
0
64000
0
-64000
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