Mitsubishi Q02CPU

9
DEVICE EXPLANATION
9
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9.3 Internal System Devices
9.3.2 Special relay (SM)
9.3.2 Special relay (SM)
(1) Definition
A special relay is used to store CPU module status data.
(2) Special relay classifications
Special relays are classified according to their applications, as shown in Table9.8.
: Usable special relay is included
: Usable special relay is not included
* 1 : In the Basic model QCPU, SM0 to 99 will be the area for error diagostics and SM100 to 129 will
be the area for a serial communication function.
* 2 : In the High Performance model QCPU, Process CPU or Redundant CPU, SM0 to 199 will be the
area for error diagnostics.
* 3 : Usable only when "Use the special relays/special registers SM1000/SD1000 and later" is selected
in the PLC system setting of the PLC parameter dialog box.
Remark
For details on special relays which can be used by the CPU module, refer to
Appendix 1.
Table9.8 Special relay classification list
Classification Special relay
CPU module
Basic model
QCPU
High
Performance
model QCPU
Process CPU Redundant CPU
Diagnostics information
SM0 to 99
*1
SM0 to 199
*2
Serial communication function
SM100 to 129
*1
System information SM200 to 399
System clock/system counter SM400 to 499
Scan information SM500 to 599
Memory card SM600 to 699
Instruction related SM700 to 799
debugging SM800 to 899
Latch area SM900 to 999
A Q/QnA conversion
compatibility
SM1000 to 1299
*3
Process control instruction SM1500 to 1509
Redundant system (host
system CPU information)
SM1510 to 1599
Redundant system (other
system CPU information)
SM1600 to 1699
Redundant system (tracking
information)
SM1700 to 1779
Redundant power supply
module information
SM1780 to 1799