FP
Σ
User's Manual
11.4 ERROR/ALARM LED is ON
265
11.4 ERROR/ALARM LED is ON
If the ERROR/ALARM LED is on, the system watchdog timer has been activated and the
operation of the PLC has been stopped. There are two ways to remedy the problem:
•
Set the mode selector of the PLC from RUN to PROG mode and turn the power off
and then on.
-
If the ERROR/ALARM LED turns on again, there is probably an abnormality in the
CPU. Please contact your dealer.
-
Check if the ERROR/ALARM LED is flashing. See "ERROR/ALARM LED is
•
Set the mode selector from PROG to RUN mode. If the ERROR/ALARM LED turns
on, the program execution time is too long.
-
Check if instructions such as JP
or LOOP are programmed in such a way that a
scan can never finish.
-
Make sure that interrupt instructions are executed in succession.
Summary of Contents for AFPG951T34
Page 7: ......
Page 17: ......
Page 18: ...Chapter 1 Safety Measures ...
Page 21: ......
Page 22: ...Chapter 2 Overview ...
Page 32: ...Chapter 3 CPU Types ...
Page 47: ...CPU Types FPΣ User s Manual 30 LD Body ...
Page 51: ...CPU Types FPΣ User s Manual 34 POU Header and LD Body ...
Page 55: ...CPU Types FPΣ User s Manual 38 LD Body ...
Page 57: ......
Page 58: ...Chapter 4 Expansion ...
Page 73: ......
Page 74: ...Chapter 5 I O Allocation ...
Page 81: ......
Page 82: ...Chapter 6 Installation and Wiring ...
Page 115: ......
Page 116: ...Chapter 7 High Speed Counter and Pulse Output ...
Page 169: ......
Page 170: ...Chapter 8 Communication ...
Page 227: ...Communication FPΣ User s Manual 210 LD Body ST Body ...
Page 233: ...Communication FPΣ User s Manual 216 POU Header LD Body ...
Page 236: ...FPΣ User s Manual 8 6 Program Controlled Communication 219 POU Header LD Body 1 2 ...
Page 237: ...Communication FPΣ User s Manual 220 2 2 ST Body ...
Page 266: ...Chapter 9 Security Functions ...
Page 273: ......
Page 274: ...Chapter 10 Other Functions ...
Page 277: ......
Page 278: ...Chapter 11 Troubleshooting ...
Page 289: ......
Page 290: ...Chapter 12 Appendix ...