Communications Between Cpu Modules When The Error Occurs - Mitsubishi Electric MELSEC Q Series User Manual

4.1.5 Communications between CPU modules when the error occurs

(1) Operation when the error occurs to the receive data
When the CPU module receives the improper data at the data communication between the CPU modules due to
noise or failure, it cancels the receive data.
When the receive data is canceled, the data which was received before this one remains without change.
When the normal data is received in the next time, it will be updated to the receive data.
(2) Data transmission operation when the error occurs
Table4.17 shows the auto refresh and the data communication between CPU modules when the host CPU
detects the self-diagnostics error.
Table4.13 Data communication between CPU modules when the self-diagnostics error occurs
Error definition
Slight error
Factors other than below
Errors on multiple CPU high speed transmission
Moderate error
function parameter
(including the consistency check error)
Severe error
*1: Shows the data transfer between the internal user device and the multiple CPU high speed transmission area of the host
CPU.
*2: Shows the data communication between the multiple CPU high speed transmission area of the host CPU and the
multiple CPU high speed transmission area of the other CPU.
*3: When the error occurs during the normal operation, transmission of the normal data before the error occurs is continued.
*4: Continues sending/receiving data between the auto refresh area 0 and CPU module if consistency check error occurs
due to PLC parameter change during normal operation.
The communication between CPU modules when the error occurs can be executed if the following CPU modules are used.
• Universal model QCPU (except Q00UCPU, Q01UCPU, Q02UCPU )
• Motion CPU (Q172DCPU, Q173DCPU )
CHAPTER4 COMMUNICATIONS BETWEEN CPU MODULES
*1
Auto refresh
between CPU modules
*4
:Transfer,
Data communication
*2
*4
*3
:Does not transfer
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