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MELSEC-Q
11 TROUBLESHOOTING
Special Register List (Continue)
(14) For redundant systems (Other system CPU information 1) for Q4AR only
SD1600 to SD1659 is only valid during the back up mode for redundant systems, and refresh
cannot be done when in the separate mode. When a standalone system SD1600 to SD1699
are all 0.
Number Name Meaning Explanation
Set by
(When set)
Corresponding
ACPU
SD
2
Corresponding
CPU
SD1600 Diagnosis error
Diagnosis error
code.
• Stores as BIN code the error code of the error that occurred
during the other system CPU diagnosis.
• Stores the latest error currently occurring.
S (Each
END)
New
SD1601
SD1602
SD1603
Diagnosis error
occurrence
time
Diagnosis error
occurrence time
• SD1600 stores the updated date and time.
• Stores each of the BCD two digits.
• Refer to SD1 to SD3 for the storage status.
(SD1
SD1601, SD2 SD1602, SD3 SD1603)
S (Each
END)
New
SD1604
Error
information
classification
Error
information
classification
• Stores the error comment information/individual information
classification code.
• Refer to SD4 for the storage status.
S (Each
END)
New
SD1605
SD1606
SD1607
SD1608
SD1609
SD1610
SD1611
SD1612
SD1613
SD1614
SD1615
Error common
information
Error common
information
• Stores the common information for the error code.
• Refer to SD5 to SD15 for the storage status.
(SD5 SD1605, SD6 SD1606, SD7 SD1607,
SD8
SD1608, SD9 SD1609, SD10 SD1610,
SD11
SD1611, SD12 SD1612, SD13 SD1613,
SD14
SD1614, SD15 SD1615)
S (Each
END)
New
SD1616
SD1617
SD1618
SD1619
SD1620
SD1621
SD1622
SD1623
SD1624
SD1625
SD1626
Error individual
information
Error individual
information
• Stores the individual information for the error code Refer to
SD16 to SD26 for the storage status.
(SD16 SD1616, SD17 SD1617, SD18 SD1618,
SD19
SD1619, SD20 SD1620, SD21 SD1621,
SD22
SD1622, SD23 SD1623, SD24 SD1624,
SD25
SD1625, SD26 SD1626)
S (Each
END)
New
SD1650 Switch status
CPU switch
status
• Stores the CPU module switch status.
• Refer to SD200 for the storage status. (SD1650
SD200)
S (Each
END)
New
SD1651 LED status CPU-LED status
• Stores the CPU module's LED status.
• Shows 0 when turned off, 1 when turned on, and 2 when
flicking.
• Refer to SD201 for the storage status. (SD1651
SD201)
S (Each
END)
New
SD1653
CPU operation
status
CPU operation
status
• Stores the CPU module operation status. Refer to SD203 for
the storage status. (SD1653
SD203)
S (Each
END)
New
Q4AR
1 Stores other system CPU self-diagnosis information and system information.
2 Shows the special register (SD ) for the host system CPU.
(15) For redundant systems (Trucking) for Q4AR only
SD1700 to SD1799 is valid only for redundant systems. These are all 0 for standalone
systems.
Number Name Meaning Explanation
Set by
(When set)
Corresponding
ACPU
SD
2
Corresponding
CPU
SD1700
Trucking error
detection count
Trucking error
detection count
• Make it the trucking error detection +1.
S (Error
occurrence)
New Q4AR
2 Shows the special register (SD ) for the host system CPU.