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MELSEC-Q
11 TROUBLESHOOTING
Special Register List (Continued)
Number Name Meaning Explanation
Set by
(When
set)
Corresponding
ACPU
D9
Corresponding
CPU
SD620
Memory card
B models
Memory card
B models
• Indicates memory card B models installed
B4 B3 B0
Drive 1
(RAM) model
Drive 2
(ROM) model
0< >0
0: Does not exist
1: SRAM
0: Does not exist
2: E
2
PROM
3: Flash ROM
B8 B7B15
-----------
S (Initial) New
Q2A (S1)
Q3A
Q4A
Q4AR
• Drive 3 capacity is stored in 1 kbyte units. S (Initial) New QCPU
SD622
Drive 3
(RAM)
capacity
Drive 3
capacity
• Drive 3 capacity is stored in 1 kbyte units S (Initial) New
Q2A (S1)
Q3A
Q4A
Q4AR
• Drive 4 capacity is stored in 1 kbyte units. S (Initial) New QCPU
SD623
Drive 4
(ROM)
capacity
Drive 4
capacity
• Drive 4 capacity is stored in 1 kbyte units S (Initial) New
Q2A (S1)
Q3A
Q4A
Q4AR
• The conditions for usage for drive 3/4 are stored as bit patterns.
(In use when ON)
• The significance of these bit patterns is indicated below:
B0: Boot operation (QBT)
B1: Parameters (QPA)
B2: Device comments (QCD)
B3: Device initial value (QDI)
B4: File R (QDR)
B5: Trace (QTS)
B6: Not used
B7: Not used
B8: Not used
B9: CPU fault history (QFD)
B10: SFC trace (QTS)
B11: Local device (QDL)
B12: Not used
B13: Not used
B14: Not used
B15: Not used
Drive 3/4 use
conditions
Drive 3/4 use
conditions
S (Status
change)
New QCPU
• The use conditions for memory card B are stored as bit patterns
(In use when ON)
• The significance of these bit patterns is indicated below:
B0: Boot operation (QBT)
B1: Parameters (QPA)
B2: Device comments (QCD)
B3: Device initial value (QDI)
B4: File R (QDR)
B5: Sampling trace (QTS)
B6: Status latch (QTL)
B7: Program trace (QTP)
B8: Simulation data (QDS)
B9: CPU fault history (QFD)
B10: SFC trace (QTS)
B11: Local device (QDL)
B12: Not used
B13: Not used
B14: Not used
B15: Not used
SD624
Memory card
B use
conditions
Memory card
B use
conditions
S (Status
change)
New
Q2A (S1)
Q3A
Q4A
Q4AR
SD640
File register
drive
Drive number: • Stores drive number being used by file register S (Initial) New
SD641
SD642
SD643
SD644
SD645
SD646
File register
file name
File register
file name
• Stores file register file name (with extension) selected at parameters
or by use of QDRSET instruction as ASCII code.
SD641
SD642
SD643
SD644
SD645
SD646
Second character
Fourth character
Sixth character
Eighth character
First character of extension
Third character of extension
First character
Third character
Fifth character
Seventh character
2E
H
(.)
Second character of
extension
B15
to
B8 B7
to
B0
S (Initial) New
SD647
File register
capacity
File register
capacity
• Stores the data capacity of the currently selected file register in 1 k
word units.
S (Status
change)
New
SD648
File register
block number
File register
block number
• Stores the currently selected file register block number.
S (Status
change)
D9035
SD650
Comment
drive
Comment
drive number
• Stores the comment drive number selected at the parameters or by
the QCDSET instruction.
S (Status
change)
New