Mitsubishi Electric MELSEC iQ-R User Manual page 175

Input signal error detection signal
Medium speed Low speed
■Device number
The following shows the device number of this input signal.
Signal name
Input signal error detection signal
■Turning on 'Input signal error detection signal' (XC)
'Input signal error detection signal' (XC) turns on when an analog input value exceeds the range set with 'CH1 Input signal
error detection lower limit setting value' (Un\G529) and 'CH1 Input signal error detection upper limit setting value' (Un\G530)
in any of A/D conversion enabled channels, after the detection condition is set in 'CH1 Input signal error detection setting'
(Un\G528). When the simple disconnection detection is set, the signal ignores the settings of 'CH1 Input signal error detection
lower limit setting value' (Un\G529) and 'CH1 Input signal error detection upper limit setting value' (Un\G530) and turns on at
the disconnection detection.
When 'Input signal error detection signal' (XC) turns on, the following operations are performed.
• 'CH1 Digital output value' (Un\G400) and 'CH1 Digital operation value' (Un\G402) hold the digital values just before the
error was detected.
• The ALM LED flashes.
■Turning off 'Input signal error detection signal' (XC)
Turning off of 'Input signal error detection signal' (XC) varies depending on the setting of 'Input signal error detection auto-
clear enable/disable setting' (Un\G302).
'Input signal error detection auto-clear
enable/disable setting' (Un\G302)
Enable (0)
Disable (1)
• When the analog input value falls within the setting range, the A/D conversion is restarted regardless of
turning on and off of 'Error clear request' (YF). However, the on state of 'Input signal error detection signal'
(XC) and the flashing state of the ALM LED are not cleared.
• Averaging processing starts from the beginning after the A/D conversion is restarted.
• 'Input signal error detection signal' (XC) operates only when the input signal error detection function is
enabled. When the input signal error detection function is disabled, 'Input signal error detection signal' (XC)
is always off.
Simultaneous
Synchronization
conversion
CH1
XC
Operation of when 'Input signal error detection signal' (XC) is off
When the cause of the input signal error is eliminated and the analog input value falls within the setting
range, 'Input signal error detection signal' (XC) automatically turns off. When 'Input signal error detection
signal' (XC) turns off, the following operations are performed.
• The ALM LED turns off.
• 'Input signal error detection flag' (Un\G40) turns off.
'Input signal error detection signal' (XC) turns off by turning on and off 'Error clear request' (YF) after the
cause of the input signal error is eliminated and the analog input value falls within the setting range. When
'Input signal error detection signal' (XC) turns off, the following operations are performed.
• The ALM LED turns off.
• 'Input signal error detection flag' (Un\G40) turns off.
• 'Latest alarm code' (Un\G2) is cleared.
'Input signal error detection flag'
(Un\G40)
'Input signal error detection
signal' (XC)
'Error clear request' (YF)
Performed by the A/D converter module.
Performed by a program.
CH2 CH3
0
Input signal error
ON
OFF
OFF
CH4
0
OFF
ON
OFF
APPX
173
Appendix 2 I/O Signals
A