Mitsubishi Electric Melsec iQ-R Series User Manual page 93

Input signal error detection signal
■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 setting value' (Un\G529) 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 setting value' (Un\G529) 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)
'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
OFF
signal' (XC)
OFF
'Error clear request' (YF)
Performed by the A/D converter module
Performed by a program
• 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.
CH1 CH2
XC
0 Input signal error
ON
ON
CH3 CH4 CH5
0
OFF
OFF
CH6 CH7 CH8
APPX
91
Appendix 2 I/O Signals
A