S7-PCI315:LED PROFIBUS DP-Master
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The subsequent table describes the meaning of the LEDs for the fieldbus device when the firmware of the PROFIBUS DP Master protocol is loaded to the device
| Color | State | Meaning |
|---|---|---|
| Duo LED red/green | ||
 (green) |
Flashing acyclic | No configuration or stack error |
(green) |
Flashing cyclic | PROFIBUS is configured, but bus communication is not yet released from the PLC. |
(green) |
On | Communication to all Slaves is established. |
 (red) |
Flashing cyclic | Communication to at least one Slave is disconnected. |
(red) |
On | Communication to one/all Slaves is disconnected. |