![](http://pdfasset.owneriq.net/2/99/29920588-a268-466b-bcc2-ca0b1d5afcf2/29920588-a268-466b-bcc2-ca0b1d5afcf2-bg80.png)
4. Troubleshooting (PROFIBUS DP)
4.2.2.1 Master: Communication Error
Master Unit LED
BF ST
Error Description
Light
OFF
Red
Light
Blinking
Communication
error
- Slave disconnected from the network
(Remote I/O communication error)
- Slave not added to the network (Scan list
collation error)
- Nonstandard wiring
- No or too many terminating resistors
- Noise intrusion
4.2.2.1.1 Master/Slave: Communication Error
BF ST
Master LED Condition Light OFF Red Light Blinking
Light OFF Green Light BlinkingAbsent Slave LED Condition
(Communication error)
Light OFF Red Light Blinking
116 Fieldbus I/O Rev.6