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MELSEC-Q
APPENDIX
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.