Special Relay (Sm) - Mitsubishi Electric melsec q00ujcpu User Manual

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.
Diagnostics information
Serial communication function
System information
System clocks and counters
Scan information, I/O refresh
Drive information
Instruction related
Debugging
Latch area
A QnA conversion compatibility
Redundant power supply module information
*1: Available only for the Q00UJCPU, Q00UCPU, Q01UCPU, and Q02UCPU. (
*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. (
Remark
For details of the special relay, refer to CHAPTER 12.
9 - 38
Table9.3 Special relay classification list
Classification Special relay
SM0 to SM199
SM100 to SM115
SM200 to SM399
SM400 to SM499
SM500 to SM599
SM600 to SM699
SM700 to SM799
SM800 to SM899
SM900 to SM999
SM1000 to SM1299
SM1780 to SM1799
Section 6.23)
Appendix 2)
*1
*2 *3
*3