Mitsubishi Electric Melsec QJ71LP21 Reference Manual page 473

APPENDICES
No. Name
3
DPLL error on reverse
SW00C7
loop side
(199)
4
Number of retries on the
SW00C8
forward loop side
(200)
4
Number of retries on the
SW00C9
reverse loop side
(201)
5
Line error on the forward
SW00CC
loop side
(204)
6
Line error on the reverse
SW00CD
loop side
(205)
7
SW00CE Number of loop switches
(206)
7
SW00CF Loop switch data pointer
(207)
3: To reset from the SW00B8 to C7, turn on the SB0006.
The numbers of times stored in the SW00B8 to SW00C7 will not cause any problems if they are counting up gradually over a long period of time. If they are
counted up rapidly in a short period of time (while monitoring with GX Developer, etc.), the cable may be faulty.
4: This may be counted up at power on/reset, but it is not an error.
Clear with the SB0005 when the number of retries is not required before starting data linking.
5: To reset the SW00CC, turn on the SB0007.
6: To reset the SW00CD, turn on the SB0008.
7: To reset the SW00CE to SW00E7, turn on the SB0009.
App - 34
Table 4 Link special register (SW) list (continued)
Description
Accumulates and stores the number of "DPLL" errors on the
reverse loop side.
Other than 0: Number of errors
Turning ON Clear communication error count (SB0006) clears
the stored value.
Optical loop: Stores the number of retries on the forward loop
side.
Coaxial/twisted bus: Stores the number of retries.
Other than 0: Number of errors
Turning ON Clear retry count (SB0005) clears the stored value.
Accumulates and stores the number of retries on the reverse
loop side.
Other than 0: Number of errors
Turning ON Clear retry count (SB0005) clears the stored value.
Accumulates and stores the number of detected line errors on
the forward loop side.
Other than 0: Number of detected line errors
Turning ON Clear forward loop transmission errors (SB0007)
clears the stored value.
Accumulates and stores the number of detected line errors on
the reverse loop side.
Other than 0: Number of detected line errors
Turning ON Clear reverse loop transmission errors (SB0008)
clears the stored value.
Accumulates and stores the number of loop checks conducted.
Other than 0: Number of loop switches
Turning ON Clear loop switch count (SB0009) clears the stored
value.
Stores the pointer that indicates the next loop switch data.
0 to 15: Loop switch data (SW00D0 to SW00DF)
Turning ON Clear loop switch count (SB0009) clears the stored
value.
Use permitted/prohibited
Control Normal
station station
Loop Bus Loop Bus
[Availability column] Loop: optical loop, Bus: coaxial/twisted bus
MELSEC-Q
Remote
Remote I/O
master
station
station
Loop Bus Loop Bus
: Available, : Not available
App - 34