System Redundancy S2; Prioritized Startup - Siemens SIMATIC ET 200eco PN M12-L System Manual

Configuring
8.3 PROFINET IO
8.3.6

System redundancy S2

System redundancy S2
An IO device with S2 system redundancy supports redundant ARs.
In a redundant system, an IO device with system redundancy S2 has a redundant AR for each
of the two CPUs (IO controllers). If one CPU fails, the IO device with S2 system redundancy
remains accessible to the remaining IO controller via the AR.
The I/O devices support system redundancy S2 (as of FW V1.1.0) on S7-400H CPUs (as of
FW V3.0) and on S7-1500R/H CPUs (as of FW V2.6).
Detailed information
You can find more information on the topic of system redundancy S2 in the STEP 7 online
help and in the Function Manual SIMATIC PROFINET with STEP 7
(https://support.industry.siemens.com/cs/ww/en/view/49948856).
8.3.7

Prioritized startup

Prioritized startup
Prioritized startup denotes the PROFINET functionality for accelerating the startup of IO
devices operated on a PROFINET IO system with RT and IRT communication.
The function reduces the time that the correspondingly configured IO devices require to
return to the cyclic user data exchange in the following cases:
• After the supply voltage has returned
• After station recovery
• After IO Devices have been activated
The prioritized startup function is supported by the ET 200eco PN M12-L I/O devices operated
in a PROFINET IO system as of these FW versions.
• RT communication as of FW V1.0.0
• IRT communication as of FW V1.1.0
You recognize valid input values and output values from value status QI = 1. In the case of
analog devices and IO-Link master communication modules, the determination of the analog
value or the establishment of the IO-Link connection can take more time, for example. You
receive invalid values with value status QI = 0 until then.
Detailed information
You can find more information in the SIMATIC PROFINET with STEP 7
(https://support.industry.siemens.com/cs/ww/en/view/49948856) system manual.
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Distributed I/O system ET 200eco PN M12-L
System Manual, 11/2023, A5E48753295-AG