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9.3.2 Special relay (SM)
(1) Definition
The special relay (SM) is an internal relay of which details are specified inside the programmable controller, and
the CPU module status data are stored in this special relay.
(2) Special relay classifications
Table9.7 shows special relay classifications.
:Usable special relay exists, :Usable special relay does not exist
*1: Valid only when "Use special relay/special register from SM/SD1000" is selected in the PLC system tab of the PLC parameter dialog box.
Remark
For details of the special relay, refer to the following.
QCPU User's Manual (Hardware Design, Maintenance and Inspection)
Table9.7 Special relay classification list
Classification
Special relay
CPU module
Basic model
QCPU
High Performance
model QCPU
Process CPU
Redundant
CPU
Diagnostics information
SM0 to SM99
SM100 to SM199
Serial communication function
SM100 to SM129
System information
SM200 to SM399
System clocks and counters
SM400 to SM499
Scan information, I/O refresh
SM500 to SM599
Drive information
SM600 to SM699
Instruction related
SM700 to SM799
Debugging
SM800 to SM899
Latch area
SM900 to SM999
A QnA conversion compatibility
SM1000 to SM1255
*1
Process control instruction
SM1500 to SM1509
Redundant system (host system
CPU information)
SM1510 to SM1599
Redundant system (other system
CPU information)
SM1600 to SM1699
Redundant system (tracking
information)
SM1700 to SM1779
Redundant power supply module
information
SM1780 to SM1799