The following table lists errors that can occur during the initial processing performed after the power is turned ON or the Inner Board is restarted.
LED Indicators on front of Loop Con-
troller
LED Indi- cator on front of CPU Unit
Problem Cause Status
Error code (Stored in error log.) Corrective action RDY EXEC ERR/ALM (See note.)
Not lit Not lit Undeter- mined
Power sup- ply problem
The correct internal pow- er supply is not being supplied to the Loop Controller.
Operation is stopped.
None Check the power supply volt- age and verify that the correct voltage is being supplied. Al- so, check the PLC's total cur- rent consumption.
The Loop Controller is not mounted properly in the CPU Unit.
Mount the Loop Control Board securely. Replace the Loop Control Board if the er- ror recurs after the Board is secured and power is turned ON again.
The Loop Controller is faulty.
Turn the power OFF and ON again. If the error occurs with a Loop Control Board, replace the Loop Control Board.If the error occurs with the Loop Controller component of a Loop-control CPU Unit, re- place the entire Loop-control CPU Unit.
Not lit Not lit Lit Initial rec- ognition er- ror (Inner Board Stopped Error)
The Loop Controller was not recognized properly by the CPU Unit.
Operation is stopped.
None Mount the Loop Control
Board securely. Replace the Loop Control Board if the er- ror recurs after the Board is secured and power is turned ON again. If the error occurs with the Loop Controller com- ponent of a Loop-control CPU Unit, replace the entire Loop- control CPU Unit.
Not lit Not lit Lit Inner Board Error
A hardware error was de- tected (in memory or elsewhere) during the self-diagnostic test.
Operation is stopped.
None Turn the power OFF and ON
again. Replace the Loop Con- trol Board if the error occurs.If the error occurs with the LoopController component of a Loop-control CPU Unit, re- place the entire Loop-control CPU Unit.
3-50
Not lit Not lit Flashing (A42404, the In- compati- ble CPU Unit Er- ror Flag, is ON.) Incompati- ble CPU Unit ·The CS1W-LCB01/05 Loop Control Board is not mounted under one of the following CPU Units: CS1G-CPU**H
CS1H-CPU*H
Operation is stopped.
None Replace the CPU Unit with one of the compatible models.
The Process-control CPU Unit (CS1D- CPU**P) Loop Controller is not mounted under a CS1D-CPU**H CPU Unit.
All the EM banks have- been converted into filememory.
Change the setting so that the EM banks are not con- verted into file memory. Not lit Not lit Lit
(A42401, the In- ner Board Bus Er- ror Flag, is ON.) Inner Board Bus Error
An Inner Board Bus Error has occurred.
Operation is stopped.
None Mount the Loop Control
Board securely. Replace the Loop Control Board if the er- ror recurs after the Board is secured and power is turned ON again.If the error occurs with the Loop Controller com- ponent of a Loop-control CPU Unit, replace the entire Loop- control CPU Unit.
Not lit Not lit Lit (A42403, the Flash Memory Data Er- ror Flag or the Duplex Function Block Data- base (RAM) Error Flag, is ON.) Parameter backup data (flash memory) error
One of the following problems was detected during a cold start. 1) The data was corrupted by noise or other factor.2) The power was interrupt- ed during a backup.Note: If the function block data- base (RAM) is valid, the data will be backed up again the next time the power is turned ON.
Operation is stopped. 0331 The de- tails code contains either the relevant block ad- dress or FFFF if all data bases are invalid.
Execute the Download or Clear all operation from CX- Process Tool Version 3.0. The Flash Memory Data Error Flag (A42403) will go OFF if the data in RAM becomes val- id.
LED Indicators on front of Loop Con-
troller
LED Indi- cator on front of CPU Unit
Problem Cause Status
Error code (Stored in error log.) Corrective action RDY EXEC ERR/ALM (See note.)
Flash- ing
Not lit Flash- ing(A42 410, the is ON
Parameter One of the following problems was detected while restoring data us- ing the simple backup function.. The Memory Card is not mounted.. The Loop Controller model is different from that used to create the project saved in the Memory Card.. The function block data backed up in the Memo- ry Card is corrupted.. There is an empty back- up file on the Memory Card created for a sim- ple backup operation performed for a Loop Controller for which a password has been set.Note: Turn the CPU Unit power from OFF to ON while pin 7 of the DIP switch on the front of the CPU Unit is ON.
Operation is stopped.
None Reinstall the Memory Card
used to back up the function block data (using simple backup), and cycle the CPU Unit power while leaving pin 7 of the DIP switch on the front of the CPU Unit turned ON.
LED Indicators on front of Loop Con-
troller
LED Indi- cator on front of CPU Unit
Problem Cause Status
Error code (Stored in error log.) Corrective action RDY EXEC ERR/ALM (See note.)