Siemens SIMATIC PROFINET Function Manual page 70

Diagnostics
4.1 Diagnostics mechanisms of PROFINET IO
Accessing the status of an IO device with a PG/PC or an HMI device
If you are connected to the Industrial Ethernet via a PG/PC with STEP 7 or an HMI device,
you can also call up diagnostics information online. This is illustrated by the following
graphic.
Num-
ber
①
②
③
Figure 4-1
70
Description
The IO device detects an error and sends diagnostics data to the IO controller.
The IO controller notifies the programming/HMI device. The display of the system diagnostics
is updated.
In STEP 7, you can read the station status for "Accessible devices" directly from the IO device
regardless of the IO controller. This is only possible if the programming device is connected to
Industrial Ethernet.
This means that you can access diagnostics information during the commissioning phase or
for servicing even if the IO controller is not operational.
PROFINET IO diagnostics with PG/PC or HMI device
PROFINET with STEP 7 V14
Function Manual, 09/2016, A5E03444486-AG