11
TROUBLESHOOTING
11.3 Checking the Communication Status of QJ71MB91
11 - 20
9
PROGRAMMING
10
DEDICATED
INSTRUCTIONS
11
TROUBLESHOOTINGAPPENDICESINDEX
(2) Count range
Counting is performed up to FFFFH.
Counting is stopped when the count reaches FFFF
H.
To continue counting, clear the diagnostic counter.
( This section (3))
(3) Clearing the diagnostic counters
The diagnostic counters can be cleared by any of the following methods:
(a) Diagnostic counters for Master function ( ThisSection (1)(a))
• Power OFF ON
• Resetting the programmable controller CPU
(b) Diagnostic counters for Slave function ( ThisSection (1)(b))
• When receiving the Clear Counters and Diagnostic Register
*1
( Section
4.11.6)
• When receiving the Restart communications option
*1
( Section 4.11.2)
• When receiving the Clear Overrun Counter and Flag
*2
( Section 4.11.6)
• Clearing the buffer memory to "0" by sequence program
• Power OFF ON
• By resetting the programmable controller CPU
* 1 The Message discard count, Data discard count and Failed transmission count are not cleared.
* 2 Only the Character overrun error count is cleared.
(4) Cautions
Diagnostic counters are not cleared while the QJ71MB91 is sending data.
Use the values of the diagnostic counters for checking the communication status.
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