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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
SD542
Constant scan
waiting time (ms unit)
SD543
Constant scan
wait time
Constant scan
waiting time (
µ
s unit)
• Waiting time at the time of constant scan setting is stored
into SD542, SD543. (Measurement is made in 100
µ
s
increments.)
SD542: Place of ms is stored (storage range: 0 to 65535)
SD543: Place of
µ
s is stored (storage range: 0 to 900)
S (First
END
processing)
New
SD544
Low speed program
cumulative execution
time (ms unit)
SD545
Cumulative
execution time
for low speed
execution type
programs
Low speed program
cumulative execution
time (
µ
s unit)
• Cumulative execution time of low speed program is stored
into SD544, SD545. (Measurement is made in 100
µ
s
increments.)
SD544: Place of ms is stored (storage range: 0 to 65535)
SD545: Place of
µ
s is stored (storage range: 0 to 900)
• Cleared to 0 after end of low speed one scan.
S (Every
END
processing)
New
SD546
Low speed program
execution time
(ms unit)
SD547
Execution time
for low speed
execution type
programs
Low speed program
execution time
(
µ
s unit)
• Execution time of low speed program during one scan is
stored into SD546, SD547. (Measurement is made in 100
µ
s
increments.)
SD546: Place of ms is stored (storage range: 0 to 65535)
SD547: Place of
µ
s is stored (storage range: 0 to 900)
• Stored every scan.
S (Every
END
processing)
New
SD548
Scan program
execution time
(ms unit)
SD549
Scan program
execution time
Scan program
execution time
(
µ
s unit)
• Execution time of scan program during one scan is stored
into SD548, SD549. (Measurement is made in 100
µ
s
increments.)
SD548: Place of ms is stored (storage range: 0 to 65535)
SD549: Place of
µ
s is stored (storage range: 0 to 900)
• Stored every scan.
S (Every
END
processing)
New
SD550
Service
interval
measurement
module
Unit/module No. • Sets I/O number for module that measures service interval U New
SD551
Module service
intervals (ms unit)
SD552
Service
interval time
Module service
intervals (
µ
s unit)
• Service intervals for the module specified in SD550 are
stored into SD551, SD552 when SM551 is turned ON.
(Measurement is made in 100
µ
s increments.)
SD551: Place of ms is stored (storage range: 0 to 65535)
SD552: Place of
µ
s is stored (storage range: 0 to 900)
S
(Request)
New
+Rem