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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) To use the dedicated instructions, change the following initial settings (default
values) for data communications by registration operation from GX
Configurator-SC or by 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 (136H))
• Setting the buffer memory used by the on-demand function
Buffer memory head address designation (addresses: 160 (A0
H)/320
(140
H))
Transmission buffer memory length designation (addresses: 163
(A3
H)/323 (143H))
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 (136H))
• Setting the transmission area
Transmission buffer memory head address designation (addresses: 162
(A2
H)/322 (142H))
Transmission buffer memory length designation (addresses: 163
(A3
H)/323 (143H))
• Setting the reception area
Receive buffer memory head address designation (addresses: 166
(A6
H)/326 (146H))
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 9.4.5 to 9.4.8.
For more details on the CSET instruction, see User's Manual (Application).
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