Instructions:
There is a way of monitoring the signal quality of the Industrial Wireless LAN connection of the IWLAN/PB Link PN IO. The quality of these signals is particularly important for the PROFINET IO applications. The IWLAN/PB Link PN IO can record its radio signal level. Here we describe how to make this recording.
 

No.	Procedure
1	The PG/PC that is to control signal recording is to have a wireless connection to the IWLAN/PB PN IO Link or be connected to the relevant access point with an Industrial Ethernet cable. Use the DOS command "telnet <IP address of the IWLAN PB Link PN IO>" to set up a connection from the PG/PC to the IWLAN/PB Link PN/IO. Enter "inform" and then"signal" and you get to the "Record Menu" (the menu from which you can start/stop recording).
2	The following DOS commands are used to start/stop recording. "recstart <Int> [Num]" - Start recording "recstop" - Stop recording ( 16 KB ) Fig. 01: Start/stop data recording
3	When recording has finished, you have the option of downloading a text file via the DOS directory, which contains the most important measurements like signal % and signal to noise ratio RSSI. The FTP protocol is used for downloading. You use the following DOS commands for downloading: Set up connection to the FTP server: "ftp <IP address of the IWLAN/PB Link PN IO>" Enter "admin" for user and password Download text file: "get signal.txt" ( 16 KB ) Fig. 02: Save recording data in text file "signal.txt"
4	This text file can be used in the "csv" format to display the recording graphically in Excel. The following figure shows an example of a saved text file. ( 37 KB ) Fig. 03: Text file "signal.txt"
5	You import the text file "signal.txt" into Excel via the menu Data -> Import external data -> Import data. Below are possible tabular and graphical presentations in Excel of the text file "signal.txt" shown in Fig. 03. ( 13 KB ) Fig. 04: Tabular presentation in Excel  ( 5 KB ) Fig. 05: Graphical presentation in Excel