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MELSEC-Q
11 TROUBLESHOOTING
Special Register List
(5) Memory card
Number Name Meaning Explanation
Set by
(When set)
Corresponding
ACPU
D9
Corresponding
CPU
• Indicates memory card A model installed
Drive 1
(RAM) model
Drive 2
(ROM) model
0: Does not exist
1: SRAM
0: Does not exist
(1: SRAM)
2: ATA FRASH
3: Flash ROM
B4 B3 B0B8 B7B15
0< >0
-----------
S (Initial and card
removal)
New QCPU
SD600
Memory
card A
models
Memory
card A
models
• Indicates memory card A model 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 PROM
3: Flash ROM
B8 B7B15
-----------
2
S (Initial and card
removal)
New QnA
S (Initial and card
removal)
New QCPU
SD602
Drive 1
(RAM)
capacity
Drive 1
capacity
• Drive 1 capacity is stored in 1 kbyte units
S (Initial and card
removal)
New QnA
S (Initial and card
removal)
New QCPU
SD603
Drive 2
(ROM)
capacity
Drive 2
capacity
• Drive 2 capacity is stored in 1 kbyte units
S (Initial and card
removal)
New QnA
• The use conditions for memory card A 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 register R (QDR)
B5: Trace (QTS)
B6: Not used
B7: Not used
B8: Not used
B9: CPU fault history (QFD)
BA: SFC trace (QTS)
BB: Local device (QDL)
BC: Not used
BD: Not used
BE: Not used
BF: Not used
S (Status change) New QCPU
• The use conditions for memory card A 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 register 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
SD604
Memory
card A use
conditions
Memory
card A
use
conditions
S (Status change) New QnA
SD620
Memory
card B
models
Memory
card B
models
• Indicates memory card B models installed
Drive 3
(RAM) model
Drive 4
(ROM) model
(0: Does not exist)
1: SRAM
0: Does not exist
(1: SRAM)
(2: E PROM)
3: Flash ROM
B4 B3 B0B8 B7B15
0< >0
-----------
2
Drive 4 is fixed to "3" because it has built-in Flash ROM.
S (Initial) New QCPU