...all configured PROFINET Slaves remain red.

No connection to the network.

Issues with firewall. Check that the device scan functions correctly.

...a PROFINET Slave remains red.

Device not in network. Check that the station name is correct.

Slave terminates the connection with errors.

Performance problems; the communication watchdog starts when establishing the connection.

For more information, see:

…PROFINET Slaves switch between green, red, and orange.

When establishing the connection, the symbol of the slave is an orange triangle. The station status is ‎Unknown‎.

If the ‎Unknown‎ state lasts for a long time before the symbol switches to red (error), then this means that the response from the slave is blocked by a firewall.

In the red/error state, the station status shows the causes. Typical errors are the causes are:

Status:

Cause

81813F02

DNS unknown RealStationName

Incorrect station name or the device is not reachable over the network

CF81FD05

Connection aborted: AR consumer DHT expired

Send clock cannot be maintained (see 1.4, 1.3.3)

CF81FD06

AR cmi timeout

Send clock cannot be maintained.

The firewall blocks the messages from the slave (UDP/RPC).

… PROFINET Slave is green, but it has a red exclamation mark, or individual modules are red.

The controller has an active connection, and therefore everything is okay.

The PROFINET Device reports PROFINET diagnostic messages only for individual modules.