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MELSEC-Q
3 SPECIFICATIONS
3.4.20 CH input signal error detection setting value/CH input signal error detection lower
limit setting value (buffer memory addresses 138 to 141: Un\G138 to Un\G141)
CH input signal error detection upper limit setting value (buffer memory addresses
142 to 145: Un\G142 to Un\G145)
(1) Set the value (upper limit setting value and lower limit setting value), at which the
error of the entered analog value will be detected, on a channel basis.
The setting value (upper limit value and lower limit value) depends on the input
signal error detection extended setting.
(a) When Same upper limit value/lower limit value is selected,
• Set the value of the input signal error detection setting for CH
Input
signal error detection extended setting (buffer memory addresses 138 to
141: Un\G138 to Un\G141).
(b) When Different upper limit value/lower limit value is selected,
• Set the value of the input signal error detection lower limit for CH
Input
signal error detection lower limit setting value (buffer memory addresses
138 to 141: Un\G138 to Un\G141)
• Set the value of the input signal error detection upper limit for CH
Input
signal error detection upper limit setting value (buffer memory addresses
142 to 145: Un\G142 to Un\G145).
(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.
If 251 is entered in the Input signal error detection upper limit setting value and
Input signal error detection lower limit setting value boxes after different upper limit
value/lower limit value is selected for the input signal error detection extended
setting, the detection function for the upper and lower limits can be disabled.
(4) Based on the input signal error detection setting values (input signal error
detection upper limit setting value and input signal error detection lower limit
setting value), the input signal error detection upper limit value and the input
signal error detection lower limit value are calculated as shown below.
The calculation results of the input signal error detection upper limit value and
the input signal error detection lower limit value depend on the used input
range.
*1
Input signal error detection upper limit value
= gain value of corresponding range + (gain value of corresponding range - offset
value of corresponding range)
{setting value (upper limit setting value)/1000) }
Input signal error detection lower limit value
= lower limit value of corresponding range + (gain value of corresponding range -
offset value of corresponding range)
{setting value (lower limit setting
value)/1000) }
1: For the lower limit value, offset value, and gain value that correspond to each
range, refer to Point (3) in this section.
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