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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
Table9.3 shows special relay classifications.
*1: Available only for the Q00UJCPU, Q00UCPU, Q01UCPU, and Q02UCPU. ( Section 6.23)
*2: Valid only when "Use special relay/special register from SM/SD1000" is selected in the PLC system tab of the PLC
parameter dialog box.
*3: Applicability differs depending on the CPU module version. ( Appendix 2)
Remark
For details of the special relay, refer to CHAPTER 12.
Table9.3 Special relay classification list
Classification Special relay
Diagnostics information SM0 to SM199
Serial communication function
SM100 to SM115
*1
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 SM1299
*2 *3
Redundant power supply module information
SM1780 to SM1799
*3