Mitsubishi Electric MELSEC-Q series User Manual page 87

Programmable controller current transformer input module
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(9) Input signal error detection signal (XC)
Input signal error detection signal (XC) turns on when an input signal error is detected.
An input signal error is detected only when the input signal error detection function is enabled.
For details on the input signal error detection function, refer to the following.
• Input Signal Error Detection Function (
(a) Turning on Input signal error detection signal (XC)
Input signal error detection signal (XC) turns on when the CT input value exceeds the input range.
The CT input module results in the following states:
• Converting or unused (0) is stored in Conversion completed flag (Un\G10) in the corresponding channel.
• For the error detected channel, the digital output value just before the error detection is held in the buffer
memory.
• ALM LED flashes.
(b) Turning off Input signal error detection signal (XC)
When the CT input value falls within the input range, turn on then off Error clear request (YF) to turn off Input
signal error detection signal (XC).
The CT input module results in the following states:
• ALM LED turns off.
• Latest error code (Un\G19) is cleared.
Input signal error detection
flag (Un\G49)
Input signal error detection
signal (XC)
Error clear request (YF)
When the CT input value falls within the input range, the digital conversion resumes regardless of the status of Input signal
error detection flag (Un\G49) and Input signal error detection signal (XC). After the first update of the digital output value,
Conversion completed (1) is stored in Conversion completed flag (Un\G10) in the corresponding channel. (ALM LED
remains flashing.)
Averaging processing starts over after the digital conversion resumed.
CHAPTER 5 I/O SIGNALS ASSIGNED TO THE CPU MODULE
Page 42, Section 4.6)
Controlled by the CT input module
Controlled by the sequence program
0 (Normal)
1 (Input signal error)
ON
OFF
OFF
0 (Normal)
OFF
ON
OFF
5
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