YASKAWA MP2300S - Reserved by System 1 (PARAM12); Reserved by System 2 (PARAM13 to PARAM16)

Appendix G MSG-SND/MSG-RCV Functions (Ethernet)
G.1 Message Transmit Function (MSG-SND)
A-66
( 11 ) Reserved by System 1 (PARAM12)
Used by system (the channel number of the communication buffer in use is stored).
Note: Before the first scan during power up, make sure to set it to “0” by using a user program.
After that, the register is used by the system, so never change the value with the user program.
( 12 ) Reserved by System 2 (PARAM13 to PARAM16)
Used by the system. Never change the value with the user program, etc.