Siemens ET 200pro - Page 307

Interface modules
12.2 Interface modules for PROFINET IO
ET 200pro distributed I/O system
Operating Instructions, 03/2013, A5E00335544-08
307
Prioritized startup
Prioritized startup describes the PROFINET functionality for accelerating the startup of
IO devices in a PROFINET IO system with RT and IRT communication.
The function reduces the time that the correspondingly configured IO devices require in
order to return to cyclic user data exchange in the following cases:
● After restoration of the voltage supply
● After recovery of a station
● After enabling of IO devices
Note
On startup of an IM
154-4 PN High Feature with "prioritized startup", the function "Reset
to factory settings" must be executed twice until the module is reset to the factory
settings.
For additional information, refer to the STEP 7 online help and the PROFINET System
Description (http://support.automation.siemens.com/WW/view/en/19292127
) manual.
Device replacement without programming device
IO devices having this function can be replaced in a simple manner:
● The device name does not have to be assigned with the programming device.
The loaded IO device is assigned a device name from the IO controller and not from the
removable medium or programming device. To do this, the IO controller uses the configured
topology and the neighborhood relationships determined by the IO devices. The configured
desired topology must agree with the actual topology.
For additional information, refer to the STEP 7 online help and the PROFINET System
Description (http://support.automation.siemens.com/WW/view/en/19292127
) manual.
Changing IO devices during operation (changing partner ports)
Functionality of a PROFINET device. If the IO controller and IO devices support this
functionality, "changing partner ports" of different devices can be assigned to an IO device
port by means of configuration, so that communication with each of these changing
IO devices is possible at a particular time via the IO device port. However, only the changing
device that is currently being communicated with may be physically connected to the
changing port.