Mitsubishi Electric MELSEC-L Series - Page 35

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CHAPTER 3 SPECIFICATIONS
3
3.4 List of I/O Signals
Do not use any use prohibited signal as an I/O signal to the CPU module. Doing so may cause malfunction of the
programmable controller system.
Remark
The I/O signals listed in this section are mainly applied when QnA series module programs are used. For the L series, the
I/O signals for intelligent function modules are turned on and off with dedicated instructions. When QnA series module
programs are used, it is recommended to replace the signals with the dedicated instructions described in the section that
describes the corresponding functions.
X19
Initial normal completion signal
(ON: Normal completion, OFF: -)
Y19
Initial request signal
(ON: At request, OFF: -)
X1A
Initial abnormal end signal
(ON: Abnormal end, OFF: -)
Y1A Use prohibited
X1B Use prohibited Y1B Use prohibited
X1C
COM.ERR. LED lit confirmation
(ON: lit, OFF: off)
Y1C Use prohibited
X1D
Predefined protocol ready
(ON: Ready, OFF: -)
Y1D Use prohibited
X1E Use prohibited Y1E Use prohibited
X1F
Watchdog timer error detection
(ON: Watchdog timer error, OFF: -)
Y1F Use prohibited
Device
number
Signal name
Device
number
Signal name