Special Relays (Sm) - Mitsubishi Electric MELSEC-Q Series User Manual

10 DEVICES

10.3.2 Special relays (SM)

10 - 33
(1) Definition
(a) A special relay is used to store High Performance model QCPU status data.
(2) Special relay classifications
Special relays are classified according to their applications, as shown below.
(a) For fault diagnosis
(b) For serial communication function : SM100 to SM129
(c) System information
(d) System clock/system counter
(e) Scan information
(f) Memory card information
(g) Instruction related
REMARK
1) For details regarding special relays which can be used by the Basic model QCPU,
refer to Appendix 1.
: SM0 to SM99
: SM200 to SM399
: SM400 to SM499
: SM500 to SM599
: SM600 to SM699
: SM700 to SM799
MELSEC-Q
10 - 33