AH500 Programming Manual 
2-14 
SM  Function 
CPU5X0-RS2 
CPU5X0-EN 
CPU5X1-RS2 
OFF
 
ON 
STOP
 
RUN 
RUN 
 
STOP
Attribute 
Default 
*SM421 
Port 4 connection status of backplane 2 (1
st
 
redundant extension backplane)   
×  ×  ○  ○  ○ 
OFF
–  –  R  OFF
*SM422 
Port 2 connection status of backplane 3 (2
nd
 
redundant extension backplane) 
×  ×  ○  ○  ○ 
OFF
–  –  R  OFF
*SM423 
Port 4 connection status of backplane 3 (2
nd
 
redundant extension backplane) 
×  ×  ○  ○  ○ 
OFF
–  –  R  OFF
*SM424 
Port 2 connection status of backplane 4 (3
rd
 
redundant extension backplane) 
×  ×  ○  ○  ○ 
OFF
–  –  R  OFF
*SM425 
Port 4 connection status of backplane 4 (3
rd
 
redundant extension backplane) 
×  ×  ○  ○  ○ 
OFF
–  –  R  OFF
*SM426 
Port 2 connection status of backplane 5 (4
th
 
redundant extension backplane) 
×  ×  ○  ○  ○ 
OFF
–  –  R  OFF
*SM427 
Port 4 connection status of backplane 5 (4
th
 
redundant extension backplane) 
×  ×  ○  ○  ○ 
OFF
–  –  R  OFF
*SM428 
Port 2 connection status of backplane 6 (5
th
 
redundant extension backplane) 
×  ×  ○  ○  ○ 
OFF
–  –  R  OFF
*SM429 
Port 4 connection status of backplane 6 (5
th
 
redundant extension backplane) 
×  ×  ○  ○  ○ 
OFF
–  –  R  OFF
*SM430 
Port 2 connection status of backplane 7 (6
th
 
redundant extension backplane) 
×  ×  ○  ○  ○ 
OFF
–  –  R  OFF
*SM431 
Port 4 connection status of backplane 7 (6
th
 
redundant extension backplane) 
×  ×  ○  ○  ○ 
OFF
–  –  R  OFF
*SM450 
Whether the memory card exists 
ON: The memory card exists. 
OFF: The memory card does not exist.   
○  ○ 
○  ○  ○ 
OFF
–  –  R  OFF
*SM451 
Write protection switch on the memory card   
ON: The memory card is write protected. 
OFF: The memory card is not write protected. 
○  ○ 
○  ○  ○ 
OFF
–  –  R  OFF
*SM452 
The data in the memory card is being 
accessed. 
ON: The data in the memory card is being 
accessed. 
OFF: The data in the memory card is not 
accessed. 
○  ○ 
○  ○  ○ 
OFF
–  –  R  OFF
*SM453 
An error occurs during the operation of the 
memory card.   
○  ○ 
○  ○  ○ 
OFF
–  –  R  OFF
SM604 
Setting the working mode of the instruction 
SORT.   
ON: The descending order 
○  ○ 
○  ○  ○ 
OFF
–  –  R/W
OFF
SM605 
Designating the working mode of the instruction 
SMOV 
○  ○ 
○  ○  ○ 
OFF
-  -  R/W
OFF
8-bit or 16-bit working mode 
SM607 
It is the matrix comparison flag. 
ON: Comparing the equivalent values 
OFF: Comparing the different values 
○  ○ 
○  ○  ○ 
OFF
–  –  R/W
OFF
SM608 
The matrix comparison comes to an end. When 
the last bits are compared, SM608 is ON. 
○  ○ 
○  ○  ○ 
OFF
–  –  R  OFF
When SM609 is ON, the comparison starts