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APPX
Appendix 4 Buffer Memory Areas
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Input signal error detection signal (b12)
Set 'CH1 Input signal error detection setting' (Un\G528) to one of upper lower limit detection, upper limit detection, lower limit
detection, and simple disconnection detection, and turns on if the analog input value exceeds the setting range that is set in
'CH1 Input signal error detection lower limit setting value (Un\G529) or 'CH1 Input signal error detection upper limit setting
value’ (Un\ G530) in the channel where the conversion has been enabled. For the cases where the simple disconnection
detection is set, 'CH1 Input signal error detection lower limit setting value' (Un\G529) or 'CH1 Input signal error detection
upper limit setting value' (Un\G530) is ignored and turns on at the disconnection detection.
When 'Input signal error detection signal' (Un\G69, b12) turns on, the following operations are performed.
• Digital output value and digital operation value of the relevant channel is held with the value just before the error was
detected.
• The ALM LED flashes.
Turning off 'Input signal error detection signal' (Un\G69, b12) differs depending on Input signal error/disconnection detection
auto-clear enable/disable setting.
Averaging processing starts over after the conversion resumes.
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Conversion completed flag (b14)
Conversion completed flag (Un\G70, b15) turns on when the first conversion has been completed for all conversion enabled
channels. When reading a digital output value, use this signal or 'Conversion completed flag' (Un\G42) as an interlock.
Input signal error/
Disconnection
detection automatic
clear enable/disable
setting
Operations related to the turning off of input signal error detection signal (Un\G69, b12)
Enable (0)
If the input signal is within the setting range, 'Input signal error detection signal' (Un\G69, b12) and 'Input signal error detection
flag' (Un\G40) automatically turn off, and ALM LED turns off.
Disable (1)
Remove the cause of the input signal error and set the input signal within the setting range. Then turn the 'error clear request'
(Un\G70, b15) OFF
→
ON
→
OFF. The input signal error detection signal '(Un\G69, b12) and the 'input signal error detection flag'
(Un\G40) will turn OFF, and the ALM LED will turn off. The latest alarm code will also be cleared.
OFF
OFF
OFF
OFF
ON
0
0
ON
Input signal error detection
Input signal error detection flag
Implement by multiple input module
Implement by program
'Input signal error detection signal'
(Un\G69, b12)
'Error clear request'
(Un\G70, b15)
Summary of Contents for MELSEC iQ-F
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