Delta AH500 - Special Auxiliary Relays

AH500 Programming Manual
2-12
2.2.7 Special Auxiliary Relays
Every special auxiliary relay has its specific function. Please do not use the special auxiliary relays
which are not defined.
The special auxiliary relays and their functions are listed as follows. As to the SM numbers marked
“*”, users can refer to the additional remarks on special auxiliary relays/special data registers. “R” in
the attribute column indicates that the special auxiliary relay can read the data, whereas “R/W” in
the attribute column indicates that it can read and write the data. In addition, the mark “–” indicates
that the status of the special auxiliary relay does not make any change. The mark “#” indicates that
the system will be set according to the status of the PLC, and users can read the setting value and
refer to the related manual for more information.
SM Function
CPU5X0-RS2
CPU5X0-EN
CPU5X1-RS2
CPU5X1-EN
CPU560-EN2
OFF

ON
STOP

RUN
RUN

STOP
Attribute
Default
SM0 Operation error ○ ○ ○ ○
○
OFF OFF – R OFF
SM1
The operation error is locked.
○
○
○
○
○
OFF
OFF
–
R
OFF
SM5
Instruction/Operand inspection error
○
○
○
○
○
OFF
OFF
–
R
OFF
*SM8
Watchdog timer error
○
○
○
○
○
OFF
–
–
R
OFF
SM9
System error
○
○
○
○
○
OFF
–
–
R
OFF
SM10
I/O bus error
○
○
○
○
○
OFF
–
–
R
OFF
*SM20
Power supply error log
○
○
○
○
○
OFF
–
–
R
OFF
*SM22
Clearing the error log
○
○
○
○
○
OFF
–
–
R/W
OFF
SM23
Clearing the download log
○
○
○
○
○
OFF
–
–
R/W
OFF
SM24
Clearing the state-changing log of the PLC
○
○
○
○
○
OFF
–
–
R/W
OFF
SM25
The online-editing processing flag is on when
the online-editing mode starts.
○ ○ ○ ○
○
OFF – – R OFF
SM26
The debugging mode processing flag is on
when the debugging mode starts.
○ ○ ○ ○
○
OFF – – R OFF
*SM96
The data is sent through COM1.
○
○
○
○
○
OFF
OFF
–
R/W
OFF
*SM97
The data is sent through COM2.
○
×
○
×
○
OFF
OFF
–
R/W
OFF
*SM98
Waiting to receive the reply through COM1
○
○
○
○
×
OFF
OFF
–
R
OFF
*SM99 Waiting to receive the reply through COM2 ○ ×
○ × ○
OFF OFF – R OFF
*SM100
Reception through COM1 is complete.
○
○
○
○
×
OFF
OFF
–
R/W
OFF
*SM101
Reception through COM2 is complete.
○
×
○
×
○
OFF
OFF
–
R/W
OFF
*SM102
An error occurs during the reception of the data
through COM1 by using the instruction
MODRW or the instruction RS.
○ ○
○ ○ ×
OFF OFF – R OFF
*SM103
An error occurs during the reception of the data
through COM2 by using the instruction
MODRW or the instruction RS.
○ ×
○ × ○
OFF OFF – R OFF
*SM104
No data is received through COM1 after a
specified period of time.
○ ○
○ ○ ×
OFF OFF – R/W OFF
*SM105
No data is received through COM2 after a
specified period of time.
○ ×
○ × ○
OFF OFF – R/W OFF
*SM106
Choice made by COM1 between the 8-bit
processing mode and the 16-bit processing
mode
ON: The 8-bit processing mode
OFF: The 16-bit processing mode
○ ○
○ ○ ×
OFF – – R/W OFF
*SM107
Choice made by COM2 between the 8-bit
processing mode and the 16-bit processing
mode
ON: The 8-bit processing mode
OFF: The 16-bit processing mode
○ ×
○ × ○
OFF – – R/W OFF