638
Troubleshooting
Section 12-2
■
CPU Standby
Detection of Special I/O Units and CPU Bus Units has not been completed.
• If a CPU Bus Unit has not started normally, check the Unit Setup.
• If a Special I/O Unit is not detected, replace the Special I/O Unit.
12-2-3 Fatal Errors
■
CPU Unit Indicators
There may be a CPU error or a fatal error if operation stops (i.e., the RUN indi-
cator turns OFF) and the ERR/ALM indicator lights.
Data on fatal errors is displayed on the Error Tab Page of the CX-Program-
mer’s PLC Error Window.
Take corrective actions after checking error details based on the CX-Program-
mer display message together with the Auxiliary Area Error Flags and error
information.
Note
1.
Errors are listed in order with the most serious errors first.
2.
If two or more errors occur at the same time, the most serious error code
will be stored in A400.
3.
I/O memory will be cleared if a fatal error occurs (except those created with
FALS instructions).
4.
I/O memory will be held when the I/O Memory Hold Bit is ON, but outputs
will be turned OFF.
POWER
Lit
RUN
Not lit
ERR/ALM
Lit
INH
---
LNK/ACT
---
BKUP
---
POWER
RUN
INH
LNK/ACT
BKUP
ERR/ALM
Summary of Contents for CP1L-EL20DR-D
Page 3: ...CP1L EL20D CP1L EM30D CP1L EM40D CP1L EL EM CPU Unit Operation Manual Produced July 2017...
Page 4: ...iv...
Page 10: ...x...
Page 22: ...xxii...
Page 34: ...xxxiv Software Licenses and Copyrights 7...
Page 192: ...158 Trial Operation and Debugging Section 5 3...
Page 250: ...216 Automatic Clock Adjustment and Specifying Servers by Host Name Section 6 7...
Page 666: ...632 Trouble Shooting Section 11 7...
Page 696: ...662 Standard Models Appendix A...
Page 805: ...771 Connections to Serial Communications Option Boards Appendix F Connecting to Unit...
Page 806: ...772 Connections to Serial Communications Option Boards Appendix F...
Page 836: ...802 PLC Setup Appendix G...
Page 838: ...804 TCP Status Transitions Appendix H...
Page 840: ...806 Ethernet Network Parameters Appendix I...
Page 842: ...808 Buffer Configuration CP1L EL EM Appendix J...
Page 844: ...810 Ethernet Specifications Appendix K...
Page 851: ...Index 817 work words 118 write protection 447...
Page 852: ...818 Index...
Page 854: ...820 Revision History...
Page 855: ......