Mitsubishi MELSEC L Series User Manual page 164

Error
Error Contents and Cause
Code
[SYSTEM LAY ERR.]
• The number of modules connected in the main
block exceeds 10.
• The number of modules connected in the
extension blocks exceeds 11.
2173
■Collateral information
• Common information: Module No. (Block No.)
• Individual information: -
■Diagnostic Timing
• At power-on/At reset
[SYSTEM LAY ERR.]
The number of extension blocks exceeds 3.
■Collateral information
• Common information: Module No. (Block No.)
• Individual information:-
■Diagnostic Timing
• At power-on/At reset
2174
[SYSTEM LAY ERR.]
The number of extension blocks exceeds 2.
■Collateral information
• Common information: Module No. (Block No.)
• Individual information: -
■Diagnostic Timing
• At power-on/At reset
[SYSTEM LAY ERR.]
An END cover that does not support an extension
system is connected in an extension system.
■Collateral information
2175
• Common information: Module No. (Block No.)
• Individual information: -
■Diagnostic Timing
• At power-on/At reset
[SYSTEM LAY ERR.]
An extension cable is connected to the branch
module during operation.
■Collateral information
2176
• Common information: Module No. (Block No.)
• Individual information: -
■Diagnostic Timing
• Always
162
Corrective Action
• Reduce the number of modules connected in
the main block to 10 or less.
• Reduce the number of modules connected in
the extension blocks to 11 or less.
• Reduce the number of extension blocks to 3 or
less.
• Reduce the number of extension blocks to 2 or
less.
• Replace the END cover with one that supports
an extension system.
• Disconnect the extension cable connected
during operation.
LED Status, Corresponding
CPU Status CPU
*28
LCPU
L26CPU-BT
L26CPU-PBT
RUN:
Off
ERR.:
*28
Flicker L02CPU
L02CPU-P
CPU Status:
Stop
*28
LCPU
*28
*28
*28