Mitsubishi Electric NZ2EX2B-60AD4 - Page 197

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APPX
A
Appendix 1 Details of Remote I/O Signals Appendix 1.1 Remote input signals
(9) Input signal error detection signal
(a) ON of Input signal error detection signal
With Input signal error detection setting (address: 0109H, 0209H) set to Disconnection detection (4H), this
signal turns on at the detection of a disconnection in any of the A/D conversion enabled channels.
(b) OFF of Input signal error detection signal
After the analog input value returns to a value that is larger than the criteria of disconnection detection (2mA or
lower, or 0.5V or lower), turning on and off Error clear request flag (RYA) results in Input signal error detection
signal (RX1C, RX2C) turning off.
Check that Input signal error detection signal (RX1C, RX2C) is off before turning off Error clear request flag
(RYA) from on. Turning on and off Error clear request flag (RYA) before Input signal error detection signal
(RX1C, RX2C) turns off does not allow Input signal error detection signal (RX1C, RX2C) to be cleared.
(c) When Input signal error detection signal turns on
•CH A/D conversion completed flag (RX10 to RX13, RX20 to RX23) in the corresponding channels turns
off.
• For the error-detected channel, the digital operation value immediately before the error detection is held in
the buffer memory.
• The ALM LED flashes.
(d) When Input signal error detection signal turns off
• The ALM LED turns off.
• Latest warning code (RWr1) is cleared.
Once the analog input value returns to a value enough to pass the disconnection detection criterion (2mA or lower, or 0.5V
or lower), A/D conversion resumes whether Input signal error detection signal (RX1C, RX2C) is reset or not. Completion of
the first A/D conversion after the restart results in CH A/D conversion completed flag (RX10 to RX13, RX20 to RX23) in the
corresponding channel turning on again.
Averaging processing starts over after the A/D conversion resumed.
(e) Device number
The device numbers of this input signal are as follows:
Signal name Main A/D converter module Extension A/D converter module
Input signal error detection signal RX1C RX2C
Controlled by the A/D converter module
Input signal error detection
signal (RX1C, RX2C)
Input signal error detection
flag (RWrA, RWr1A)
Error clear request flag
(RYA)
Controlled by the program
Input signal error detection
00
ON
ON
OFF
OFF