Mitsubishi Electric MELSEC-Q Structured Programming Manual page 246

FXCPU Structured Programming Manual
[Device & Common]
2. Operations of special devices for error detection
Special auxiliary relays for error detection and special data registers for error detection operate under the
relationship shown below.
The error occurrence state can be checked by monitoring the contents of auxiliary relays and data registers
from a programming tool or by using the PLC diagnosis function.
D8009
D8060
D8061
D8069
I/O bus
D8062
check
D8063
D8438
D8064
D8065
D8066
D8067
D8487
D8449
D8489
3. Error detection timing
M8060 I/O configuration error
M8061 PLC hardware error
M8062 Serial communication error 0 [CH0]
M8063 Serial communication error 1 [CH1]
M8438 Serial communication error 2 [CH2]
M8064 Parameter error
M8065 Syntax error
M8066 Circuit error
M8067 Operation error
M8068 Operation error latch
M8109 Output refresh error
M8316 Unconnected I/O specification error
M8318 BFM initialization failure
M8449 Special block error
M8487 USB communication error
M8489 Special parameter error
D8166 Special block error condition
244
M8009 24 VDC failure
M8060 I/O configuration error
M8061 PLC hardware error
M8062 Serial communication error 0
M8063 Serial communication error 1
M8438 Serial communication error 2
M8064 Parameter error
M8065 Syntax error
M8066 Circuit error
M8067 Operation error
M8068 Operation error latch
Clear errors, and then forcibly clear M8068 using a programming tool.
M8316 Unconnected I/O
specification error
M8318 BFM initialization
failure
M8487 USB communication error
M8449 Special block error
M8489 Special parameter error
Error item
5.1 FX3S/FX3G/FX3GC/FX3U/FX3UC PLCs
D8004
Special M number
(smallest number)
of error occurrence
D8315 D8314
D8313 D8312
D8317 D8316
D8318
D8319
Error detection timing
When power is When PLC mode
turned ON from switches from
OFF STOP to RUN
Checked Checked
Checked -
- -
- -
- -
Checked Checked
- -
- -
- -
- Checked
- -
- -
Checked -
- -
5 Errors
M8004
Turns ON when an error occurs.
Error step number
The error step number is also
stored in D8069 for a program
consisting of 32K steps or less.
1st error step No. latch
The first error step number is
also stored in D8068 for a program
consisting of 32K steps or less.
Error step number
Error unit number
Error BMF number
Other timing
-
Always
When PLC receives signal from
counterpart station
When PLC receives signal from
counterpart station
When PLC receives signal from
counterpart station
When program is changed (STOP)
When program is transferred (STOP)
RUN mode
Always
RUN mode
-
Always
When PLC receives signal from
counterpart station
When special parameter is changed
(STOP)
Always