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APPENDICES
Appendix 4 Replacing Local Station from A/QnA Series to Q Series
Appendix 4.1 Differences between Q series and A/QnA series local stations
App - 9
APPENDICESINDEX
Appendix 4 Replacing Local Station from A/QnA Series to Q Series
This section describes replacement of a local station from A/QnA series to Q series.
Appendix 4.1 Differences between Q series and A/QnA series local
stations
The following table shows differences between Q series and A/QnA series local stations.
When replacing an A/QnA series local station with a Q series one, pay attention to the
following.
Table App.3 Differences between Q series and A/QnA series local stations
Item
Description
Q series local station A/QnA series local station
Link refresh
Refreshes data with the sequence program.
CHAPTER 7 PROGRAMMING
Link parameter setting (refresh parameters) is not
required.
Automatically refreshes data at either of the following
timing.
•Upon completion of link scan
•Only after execution of the END instruction in the
sequence program
For the AnUCPU, QnACPU, A2US(H)CPU(S1) and
Q2AS(H)CPU(S1), refresh ranges can be changed with
refresh parameters.
Does not refresh data when the CPU module is in STOP
status.
Operation after power
OFF ON, or
resetting CPU module
(CPU module is in
STOP.)
Starts data communication with other stations by
executing the program for refresh (Y10 = ON) with the
CPU module set to RUN.
Until then, the master station treats the Q series local
station as a faulty station (relevant bit in D9228 to D9231
is turned ON).
Starts data communications with other stations.
LRDP/LWTP
instruction receive
processing
Handles the received instruction with the sequence
program.
CHAPTER 7 PROGRAMMING
Handles the received instruction by the system.
(The program for receiving LRDP/LWTP instruction is not
required.)
If the LRDP/LWTP instruction is received when the CPU
module is in STOP status, sends an error response to
the master station (4: LRDP/LWTP inexecutable on the
station).
Access from
peripheral to host
station
The following are not available.
•Buffer memory batch monitor/test
•Network diagnostics of GX Developer
Not particularly restricted.
Access from
peripheral to other
stations
*1
Unable to access other stations.
•Master station Q series local station
•Q series local station Master station
•The master station can access A/QnA series local
stations.
•A/QnA series local stations can access the master
station.
Network diagnostics
of GX Developer
Unable to use the network diagnostics of GX Developer.
The data link status or fault location can be checked by
refreshing the special relay (for link) and special register
(for link) of the local module into CPU module devices.
Can use the network diagnostics of GX Developer.