3 SPECIFICATIONS

MELSEC-Q

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 (96H), 310 (136H))

•Setting the buffer memory used by the on-demand function

Buffer memory head address designation (addresses 160 (A0H), 320 (140H))

Data length designation (addresses 161 (A1H), 321 (141H))

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 (96H), 310 (136H))

•Setting the transmission area

Transmission buffer memory head address designation (addresses 162 (A2H), 322 (142H))

Transmission buffer memory length designation (addresses 163 (A3H),

323(143H))

•Setting the reception area

Receive buffer memory head address designation (addresses 166 (A6H), 326 (146H))

Receive buffer memory length designation (addresses 167 (A7H), 327 (147H))

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).

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