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CHAPTER 4 DEVICES
4
4.3 Internal System Devices
4.3.2 Special relay (SM)
4.3.2 Special relay (SM)
The special relay (SM) is an internal relay whose specifications are determined by the programmable controller. This
device stores the CPU module status data. For details, refer to the following.
QCPU User's Manual (Hardware Design, Maintenance and Inspection)
4.3.3 Special register (SD)
The special register (SD) is an internal relay whose specifications are determined by the programmable controller. This
device stores the CPU module status data (such as error diagnostics and system information). For details, refer to the
following.
QCPU User's Manual (Hardware Design, Maintenance and Inspection)
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