Mitsubishi Electric Q26UD(E)HCPU User Manual page 328

Error
Error and cause
code
[UNIT BUS ERROR]
When I/O assignment parameters are set, the
CPU module cannot access the special function
module during initial communications. (If an error
occurs, the start I/O number of the corresponding
special function module is stored in the common
1711
information.)
■Collateral information
• Common information: Module No. (Slot No.)
• Individual information: -
■Diagnostic timing
• At power-on
[UNIT BUS ERROR]
The FROM/TO instructions cannot be executed
because of the error in the bus connecting with the
special function module. (If an error occurs, the
program error location is stored in the individual
1712
information.)
■Collateral information
• Common information: Module No. (Slot No.)
• Individual information: Program error location
■Diagnostic timing
• During execution of FROM/TO instruction set
[END COVER ERR.]
A failure was detected on the END cover.
■Collateral information
• Common information: Module No. (Block No.)
1720
• Individual information: -
■Diagnostic timing
• At power-on/At reset/When an END instruction
executed
[SYSTEM RST ERR.]
• An extension cable is not securely connected.
• An error was detected in the system bus.
■Collateral information
1730
• Common information: Module No. (Block No.)
• Individual information: -
■Diagnostic timing
• At power-on/At reset
[BRANCH UNIT ERR.]
An error was detected in the branch module.
■Collateral information
1740 • Common information: Module No. (Slot No.)
• Individual information: -
■Diagnostic timing
• Always
[EXTEND UNIT ERR.]
An error was detected in the extension module.
■Collateral information
• Common information: Module No. (Block No.)
1750
• Individual information: -
■Diagnostic timing
• At power-on/At reset
326
Corrective action
Reset the CPU module and run it again. If the
same error code is displayed again, the
cause is a hardware failure of the LA1S
extension base unit. Please consult your local
Mitsubishi representative.
Reset the CPU module and run it again. If the
same error code is displayed again, the
cause is a hardware failure of the LA1S
extension base unit. Please consult your local
Mitsubishi representative.
• Securely connect the connector part of an
extension cable to the module. (Insert the
connector until it clicks.)
• Replace the END cover.
• Reset the CPU module and run it again. If
the same error code is displayed again, the
cause is a hardware failure of the CPU
module, I/O module, intelligent function
module, END cover, branch module, or
extension module. Please consult your
local Mitsubishi representative.
• Securely connect the connector part of an
extension cable to the module. (Insert the
connector until it clicks.)
• Replace the END cover.
• Reset the CPU module and run it again. If
the same error code is displayed again, the
cause is a hardware failure of the CPU
module, I/O module, intelligent function
module, END cover, branch module, or
extension module. Please consult your
local Mitsubishi representative.
• Replace the branch module.
• Reset the CPU module and run it again. If
the same error code is displayed again, the
cause is a hardware failure of the CPU
module, I/O module, intelligent function
module, END cover, branch module, or
extension module. Please consult your
local Mitsubishi representative.
• Replace the extension module.
• Reset the CPU module and run it again. If
the same error code is displayed again, the
cause is a hardware failure of the CPU
module, I/O module, intelligent function
module, END cover, branch module, or
extension module. Please consult your
local Mitsubishi representative.
LED status, Corresponding
CPU status
RUN: Off
ERR.:Flashing
LCPU
CPU Status:Stop
RUN: Off
ERR.:Flashing
LCPU
CPU Status:Stop
RUN: Off
ERR.:Flashing
LCPU
CPU Status:Stop
RUN: Off
ERR.:Flashing
LCPU
CPU Status:Stop
RUN: Off
ERR.:Flashing
LCPU
CPU Status:Stop
RUN: Off
ERR.:Flashing
LCPU
CPU Status:Stop
CPU