Communication
11.2 PROFINET
S7-1200 Programmable controller
958 System Manual, V4.2, 09/2016, A5E02486680-AK
The watchdog time is the time interval that an IO controller or IO device permits, without
receiving IO data. If the IO device is not supplied by the IO controller with data within the
watchdog time, the device detects the missing frames and outputs substitute values. This is
reported in the IO controller as a station failure.
You can configure the watchdog time for PROFINET IO devices. Do not enter the watchdog
time directly, but as "Accepted number of update cycles when IO data is missing". The
resulting watchdog time is automatically calculated from the number of update cycles.
To assign the watchdog time, follow these steps:
1. Select the PROFINET interface of the IO device in the Network or Device view.
2. In the properties of the interface, navigate to: Advanced options > Realtime settings > IO
cycle
3. Select the required number of cycles from the drop-down list.
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