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MELSEC-Q
3 SPECIFICATIONS
POINT
(1) Use the FROM/TO instructions or other applicable commands to access the
buffer memory shown in this section when a program for a QnA series serial
communication module is utilized for the Q series C24 (see Section 2 in
Appendix).
In QCPU, the access to the buffer memory of an intelligent function module is
executed with a dedicated instruction.
It is not necessary to access directly using the FROM/TO instructions or other
instructions from the sequence program, except when accessing the buffer
memory as shown in the programming on each function reference page.
(2) When a program for a QnA series serial communication module is utilized for
the Q series C24, it is recommended to replace the instructions with the
dedicated instructions shown on the corresponding function reference page of
each manual for the Q series C24.
(3) The following initial settings (changing the default values) for data
communication must be performed by a registration operation using GX
Configurator-SC or by executing the CSET instruction for the sequence
program.
1) Initial settings for communication using the MC protocol
• Setting the unit of data length sent by the on-demand function
Word/byte units designation (addresses 150 (96
H
), 310 (136
H
))
• Setting the buffer memory used by the on-demand function
Buffer memory head address designation (addresses 160 (A0
H
), 320
(140
H
))
Data length designation (addresses 161 (A1
H
), 321 (141
H
))
2) Initial settings for communication using the non procedure/bidirectional
protocols
• Setting the unit of data length to be sent and received
Word/byte units designation (addresses 150 (96
H
), 310 (136
H
))
• Setting the transmission area
Transmission buffer memory head address designation (addresses 162
(A2
H
), 322 (142
H
))
Transmission buffer memory length designation (addresses 163 (A3
H
),
323 (143
H
))
• Setting the reception area
Receive buffer memory head address designation (addresses 166
(A6
H
), 326 (146
H
))
Receive buffer memory length designation (addresses 167 (A7
H
), 327
(147
H
))
For more details on the registration operation by GX Configurator-SC, see
the explanation of the system settings of the corresponding protocol in
Sections 8.4.5 to 8.4.8.
For more details on the CSET instruction, see Section 16.4 of the User's
Manual (Application).