Mitsubishi Q2ACPU User Manual page 365

22. TROUBLE SHOOTING
Error
Error Contents and Cause
Code
[SP. UNIT DOWN]
The special function module was accessed during
the execution of a FROM/TO instruction set, but
there was no response.
(When an error is generated, the program error
location corresponding to the individual information
1402
is stored.)
■Collateral informationmmon
• Common Information:Module No.(Slot No.)
• Individual Information:Program error location
■Diagnostic Timing
• During execution of FROM/TO instruction set
[CONTROL-BUS. ERR.]
When performing a parameter I/O allocation the
intelligent function module/special function module
could not be accessed during initial
communications.
(On error occurring, the head I/O number of the
corresponding intelligent function module/special
1411
function module is stored in the common
information.)
■Collateral informationmmon
• Common Information:Module No.(Slot No.)
• Individual Information:–
■Diagnostic Timing
• At power ON / At reset
[CONTROL-BUS. ERR.]
The FROM/TO instruction is not executable, due to
a control bus error with the intelligent function
module/special function module.
(On error occurring, the program error location is
1412
stored in the individual information.)
■Collateral informationmmon
• Common Information:Module No.(Slot No.)
• Individual Information:Program error location
■Diagnostic Timing
• During execution of FROM/TO instruction set
[SYS. UNIT DOWN]
Hardware fault at the system management module
AS92R.
■Collateral informationmmon
1421
• Common Information:–
• Individual Information:–
■Diagnostic Timing
• Always
[AC/DC DOWN]
• A momentary power supply interruption has
occurred.
• The power supply went off.
1500 ■Collateral informationmmon
• Common Information:–
• Individual Information:–
■Diagnostic Timing
• Always
Corrective Action
The CPU module, base unit and/or the special
function module that was accessed is experiencing
a hardware fault.(Contact your local Mitsubishi
representative.)
Reset the CPU module and RUN it again. If the
same error is displayed again, the intelligent
function module/special function module, CPU
module or base unit is faulty. (Contact your local
Mitsubishi representative.)
This suggests a system management module
AS92R hardware fault.
(Contact your local Mitsubishi representative.)
Check the power supply.
22 - 20
LED Status Corresponding
CPU Status CPU
QnA
RUN:
Off
ERR.:
Flicker
CPU Status:
Stop
Q4AR
RUN:
On
ERR.:
Off QnA
CPU Status:
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