APPENDIX

MELSEC-Q

Appendix 2.3 Using Programs Designed for the Computer Link Module and Installing the Q Series C24 into Existing Systems

This section describes how to use programs created for A series computer link modules and installing the Q series C24 into an existing system.

POINT

When using the Q series C24, make sure to set the operation mode, station number, and transmission specifications with the following parameter setting screen of GX Developer.

• "Intelligent function module switch setting" screen

The Q series C24 does not have the setting switches to set the operation mode, station number, and transmission specification that are available in the computer link module for A series.

Appendix 2.3.1 Using programs designed for the computer link module

The data communication between the PLC CPU and external device as well as other PLC CPU that has been performed by A series computer link modules (hereinafter abbreviated as UC24/C24-S8) can also be performed using the Q series C24. However, UC24/C24-S8 and the Q series C24 have major differences in the following points.

For PLC CPU side, create a new program according to the explanation in the section of the function used.

(Differences between UC24/C24-S8 and the Q series C24)

•Initial setting items and the setting method of addresses and special application areas of the buffer memory

•Input/output signals for handshake

•Dedicated instructions of the PLC CPU

(1)Initial settings for special application area in buffer memory

1)In the Q series C24 the addresses for special application areas in the buffer memory are different from those of UC24/C24-S8. The Q series C24 has more initial setting items.

The setting method is different such that the settings are performed using the utility package (GX Configurator-SC).

2)Register necessary initial setting values according to Chapter 8.

3)The default value for the CD terminal check setting is changed to "No check".

(2)Data communication using the MC protocol (identical to the communication functions of the dedicated protocol of UC24/C24-S8)

(a)Communication protocol setting

Data communication is performed using an A compatible 1C frame by setting the communication protocol setting of the Q series C24 specified by GX Developer to the same form as set in the mode setting switch of UC24/C24-S8.

App. - 10

App. - 10