11 TROUBLESHOOTING

MELSEC-Q

Special Register List (Continued)

 

 

 

 

Set by

Corresponding

Corresponding

Number

Name

Meaning

Explanation

ACPU

(When set)

CPU

 

 

 

 

D9

 

 

 

 

 

 

SD542

 

Constant scan

• Waiting time at the time of constant scan setting is stored

S (First

 

 

Constant scan

waiting time (ms unit)

into SD542, SD543. (Measurement is made in 100s

 

 

 

 

 

 

 

increments.)

END

New

 

 

wait time

Constant scan

 

SD543

SD542: Place of ms is stored (storage range: 0 to 65535)

processing)

 

 

 

waiting time (s unit)

 

 

 

 

SD543: Place of s is stored (storage range: 0 to 900)

 

 

 

 

 

 

 

 

 

 

Cumulative

Low speed program

• Cumulative execution time of low speed program is stored

 

 

 

SD544

cumulative execution

into SD544, SD545. (Measurement is made in 100s

 

 

 

execution time

S (Every

 

 

 

for low speed

time (ms unit)

increments.)

END

New

 

 

Low speed program

SD544: Place of ms is stored (storage range: 0 to 65535)

 

SD545

execution type

processing)

 

 

programs

cumulative execution

SD545: Place of s is stored (storage range: 0 to 900)

 

 

 

 

time (s unit)

• Cleared to 0 after end of low speed one scan.

 

 

 

 

 

 

 

 

 

 

Low speed program

• Execution time of low speed program during one scan is

 

 

 

SD546

Execution time

execution time

stored into SD546, SD547. (Measurement is made in 100s

S (Every

 

 

 

for low speed

(ms unit)

increments.)

 

 

 

END

New

 

 

execution type

Low speed program

SD546: Place of ms is stored (storage range: 0 to 65535)

 

 

processing)

 

 

SD547

programs

execution time

SD547: Place of s is stored (storage range: 0 to 900)

 

 

 

 

 

 

 

(s unit)

• Stored every scan.

 

 

 

 

 

Scan program

• Execution time of scan program during one scan is stored

 

 

 

SD548

 

execution time

into SD548, SD549. (Measurement is made in 100s

S (Every

 

 

 

Scan program

(ms unit)

increments.)

 

 

 

END

New

 

 

execution time

Scan program

SD548: Place of ms is stored (storage range: 0 to 65535)

 

 

processing)

 

 

SD549

 

execution time

SD549: Place of s is stored (storage range: 0 to 900)

 

 

 

 

 

 

 

 

(s unit)

• Stored every scan.

 

 

 

 

Service

 

 

 

 

 

SD550

interval

Unit/module No.

• Sets I/O number for module that measures service interval

U

New

 

measurement

 

 

 

 

 

 

 

 

module

 

 

 

 

 

SD551

 

Module service

• Service intervals for the module specified in SD550 are

 

 

+Rem

 

intervals (ms unit)

stored into SD551, SD552 when SM551 is turned ON.

 

 

 

 

Service

S

 

 

 

 

(Measurement is made in 100s increments.)

New

 

 

interval time

Module service

(Request)

 

SD552

SD551: Place of ms is stored (storage range: 0 to 65535)

 

 

 

intervals (s unit)

 

 

 

 

 

SD552: Place of s is stored (storage range: 0 to 900)

 

 

 

 

 

 

 

 

 

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