2.7 Communications with a Mitsubishi PLC (QnA-compatible 3E Frame Protocol)
Message Functions
2-185
For System Use (PARAM48)
This parameter is used by the system. It contains the channel number of the communications buffer that is
currently in use.
Reserved for System (PARAM49 to PARAM51)
This parameter is used by the system.
A user program must set PARAM48 to 0 on the first scan after startup. Thereafter, do not change the
value of PARAM48 from a user program or by any other means. PARAM48 will be used by the sys-
tem.
Do not change the values of PARAM49 to PARAM51 from a user program or by any other means.
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