Chapter 8 Logic Instructions
8-195
5. When word registers in the slave are read and written, the %MW registers of local device
can be chosen as the registers for storing the read and written data. The storage registers
range from %MW0~%MW32767. If registers exceed the range or other register is used, an
error will occur in the instruction.
When bit registers in the slave are read and written, the %MW and %QW registers of local
device can be chosen as the registers for storing the read and written data. The ranges of
storage registers are %MW0~%MW32767 and %QW0~%QW63. If registers exceed the
ranges or other register is used, an error will occur in the instruction.
6. When the bit registers of the slave are read and written and the offset value is 0, the PLC
will begin to read or write Read_Length and Write_Length bits of data starting at bit0 of the
starting register where the data are stored.
7. When the bit registers of the slave are read and written and the offset value is n which is not
equal to 0, the PLC will begin to read or write Read_Length and Write_Length bits of data
by offsetting n bits backward.
E.g. Write_Buffer_Address_Offset is 0, ObjType is 1, the register combined with
Write_Buffer_Address is %MW0 and Write_Length is 5. Then the PLC will send the data in
%MX0.0~%MX0.4 to the slave.
E.g. Write_Buffer_Address_Offset is 8, ObjType is 1, the register combined with
Write_Buffer_Address is %MW0 and Write_Length is 5. Then the PLC will send the data in
%MX1.0~%MX1.4 to the slave.
8. The parameter values of this instruction are only valid during the operation of the PLC. When
the the motion controller is repowered after power off, the parameters configured before the
power off are all invalidated. The ETH_Link_Config instruction must be performed again if
the configuration before the power off is needed to use.
9. When the MODBUS TCP master function of the motion controller is used, the motion
controller conducts the data exchange with other slaves via the Ethernet LAN2 port of the
motion controller.
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