870
APPX
Appendix 5  List of Special Register Areas
CPU module database access function
The following is the special register area relating to the CPU module database access function.
*1 The CPU module where this function can be used supports this special register area.
No. Name Data stored Details Set by 
(setting 
timing)
CPU
SD1498 Start-up status of 
CPU module 
database
Start-up status of 
CPU module 
database
When the CPU module database access function is enabled with 
the module parameter, the CPU module database start-up status is 
stored.
0:No error
FFFFH: Starting-up
Other than above: Start-up error
For the stored value at the start-up error, refer to the list of error 
codes that occur when a database access instruction is executed. 
( MELSEC iQ-R Programming Manual (CPU Module 
Instructions, Standard Functions/Function Blocks))
S (Status 
change)
Rn
*1