Mitsubishi Electric MELSEC-Q Series - Page 312

310
(3) Checking transient transmission errors
Transient transmission errors are checked through the CC IE Control diagnostics, but they also can be checked
with link special relay (SB) and link special register (SW). ( Page 526, Section 10.3)
(a) Checking stations where transient transmission errors have occurred
1. When a transient transmission error occurs, Transient error of each station (SB0170) is turned ON.
2. The station where a transient transmission error has occurred can be checked in Transient error
detection status of each station (SB0170 to SB0177).
3. When Clear transient transmission error counter (SB000A) is turned ON, Transient error detection
status of each station (SW0170 to SW0177) can be cleared.
(b) Checking the number of transient transmission errors
1. When a transient transmission error occurs, Transient error (SB008F) is turned ON.
2. The number of transient transmission errors is stored in Number of transient transmission errors
(SW006F).
3. When Clear transient transmission error counter (SB000A) is turned ON, Number of transient
transmission errors (SW006F) can be cleared.
(c) Clearing Transient transmission error log
By setting Clear transient transmission error counter (SB000A) to ON, the transient transmission error log
(Un\G2592 to 2753) can be cleared.
Remark
The contents of transient errors can be checked with either of the following.
• CC IE Control diagnostics ( Page 533, Section 10.3.3)
• Completion status in control data of dedicated instruction ( Page 324, CHAPTER 9)
No. Description No. Description
SB000A Clear transient transmission error counter —
SB0170 Transient error of each station
SW0170 to
SW0177
Transient error detection status of each station
No. Description No. Description
SB000A Clear transient transmission error counter —
SB008F Transient errors SW006F Number of transient transmission errors