Mitsubishi MELSEC iQ-F, User Manual

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APPX
Appendix 4 Buffer Memory Areas
159
A
■
Enabling the setting
Turn off
→
on
→
off 'Operating condition setting request' (Un\G70, b9) to enable the setting.
■
Default value
The default value is Disable (0).
CH1 Input signal error detection lower limit setting value
Set a lower limit value to detect an error for the input analog value.
For details on the input signal error detection function, refer to the following.

Page 46 Input Signal Error Detection Function
■
Buffer memory address
The following shows the buffer memory address of this area.
■
Setting range
The possible setting range is from 0 to 250 (0 to 25.0%). (Set it in a unit of 0.1%)
If a value other than the above is set, an input signal error detection setting range error (error code: 1C1
 H) occurs.
When the 'CH1 Input type/range setting' (Un\G598) is set to resistance temperature detector or thermocouple, the setting of
'CH1 Input signal error detection lower limit setting value' (Un\G529) is ignored.
The input signal error detection lower limit value is calculated by using ‘Input signal error detection lower limit setting value’
(Un\G529) as follows. The input signal error detection lower limit value to be calculated varies depending on the input range
used.
Input signal error detection lower limit value = Lower limit value of each range - (Gain value of each range - Offset value of
each range)
× (Input signal error detection lower limit setting value/1000)
Ex.
When 'CH1 Input signal error detection lower limit setting value' (Un\G529) is set to 100 (10%)
Range used: 4 to 20 mA
The input signal error detection lower limit value is calculated as follows:
Detection conditions vary depending on the setting of 'CH1 Input signal error detection setting' (Un\G528) as follows:
• When 'CH1 Input signal error detection setting' (Un\G528) is set to Upper and lower limit detection (1), the detection is
performed with both the input signal error detection upper limit value and the input signal error detection lower limit value.
• When 'CH1 Input signal error detection setting' (Un\G528) is set to Lower limit detection (2), the detection is performed only
with the input signal error detection lower limit value.
• When 'CH1 Input signal error detection setting' (Un\G528) is set to Upper limit detection (3), the value set in this area is
ignored.
• When 'CH1 Input signal error detection setting' (Un\G528) is set to Simple disconnection detection (4), the value set in this
area is ignored.
■ Enabling the setting
Turn off
→
on
→
off 'Operating condition setting request' (Un\G70, b9) to enable the setting.
■
Default value
The default value is set to 50.
Buffer memory name CH1 CH2 CH3 CH4 CH5 CH6 CH7 CH8
CH

Input signal error detection lower limit setting value 529 729 929 1129 1329 1529 1729 1929
CH  Input signal error detection lower limit setting value (In
FX2N allocation mode function)
1161 1162 1163 1164 1165 1166 1167 1168
Input signal error detection lower limit value = 4 - (20 - 4) ×
100
1000
= 2.4 mA