Siemens PROFINET SIRIUS 3RW5 - Operation on failure of the bus connection to the controller

Result
The 3RW5 soft starter is integrated into the PROFINET IO system as an IO device in the
con󹪝guration software of the controller.
6.3 Operation on failure of the bus connection to the controller
An interruption in the connection between the 3RW5 soft starter and the controller must not
result in an unde󹪝ned plant status.
Depending on the 3RW5 soft starter, you can set parameters that de󹪝ne the behavior of the
3RW5 soft starter on interruption of the connection with the controller in "Automatic" mode.
• 3RW50 and 3RW52 Soft Starters (Page 64)
• 3RW55 and 3RW55 Failsafe Soft Starters (Page 65)
6.3.1 3RW50 and 3RW52 Soft Starters
The 3RW50 and 3RW52 soft starters do not support the parameters for "Operation with CPU /
Master". On failure of the bus connection or CPU stop, all bits of the process image output (PIQ)
are set to 0. In reference to the operating mode, the 3RW50 and 3RW52 soft starters respond as
follows:
• 3RW50 soft starter: The 3RW50 soft starter behaves in accordance with the
parameter "Control via digital input" (Page 33).
• 3RW52 soft starter with 󹪝rmware version earlier than V2.0.1: The 3RW52 soft starter remains
in the "Automatic" mode or switches to the "Automatic" mode.
Note
Response of 3RW52 soft starter in the event of bus connection failure or CPU stop
(3RW52 soft starter with 󹪝rmware version earlier than V2.0.1)
To enable you to continue controlling the 3RW52 soft starter in the "Automatic" mode on
failure of the bus connection, you require a 3RW5 HMI (accessory) which enables you to
switch to the "Manual operation local" mode (Page 24).
Without 3RW5 HMI you cannot control the 3RW52 soft starter until the bus connection has
been restored.
Alternatively, you can remove the 3RW5 communication module (Page 40). Then restore the
3RW52 soft starter on the device to the factory setting, in order to switch to the "Manual
operation local ‑ Input controlled" mode.
• 3RW52 soft starter from 󹪝rmware version V2.0.1: The 3RW52 soft starter behaves in
accordance with the parameter "Control via digital input" (Page 33).
Additional information
You will 󹪝nd more information on restoring the factory setting on the device in the Equipment
Manual of the 3RW52 soft starter.
Con󹪝guring
6.3 Operation on failure of the bus connection to the controller
SIRIUS 3RW5 PROFINET communication modules
64 Equipment Manual, 05/2021, A5E35631297002A/RS-AD/004