Siemens SIRIUS 3RW51 Equipment Manual page 103

Operating principle
The parameter "Control via digital input" is only relevant when using a 3RW5 communication
module. The parameter is helpful, for example, for applications in which the bus connection
serves mainly for observation and monitoring purposes.
The parameter defines how the master control function behaves on failure of the bus connection
or a CPU stop. A failure of the bus connection or a CPU stop can also occur in the operating mode
"manual - local", for example when observing or monitoring via the bus connection. You can use
the parameter to disable a switchover to the "Automatic" mode and operating mode "manual -
bus".
Setting options
• Parameterization via key combination on the 3RW51 Soft Starter (Page 79)
• 3RW5 HMI High Feature (accessory) with firmware version V3.0 or higher
Access protection to 3RW5 HMI High Feature is not active or has been reset.
Menu: "Parameters > Soft Starter > Additional parameters > Control via digital input"
Parameters
Parameter
Control via digital input
Note that for the settings "Manual activation" and "No change on bus error", the 3RW51 soft
starter switches to the "Automatic" mode after installation of the 3RW5 communication module
to the 3RW51 soft starter.
SIRIUS 3RW51 Soft Starter
Equipment Manual, 09/2020, A5E37108631002A/RS-AC/003
8.10 Response to bus errors / Control via digital input
Description
• Manual activation
On failure of the bus connection or a CPU stop the 3RW51
Soft Starter remains in the "Automatic" mode or
the 3RW51 Soft Starter switches to the "Automatic" mode.
• Permanent activation
A switch to the "Automatic" mode and operating mode
"manual - bus" is not possible. If the 3RW51 soft starter is
in the "Automatic" or "manual - bus" mode, the 3RW51 soft
starter switches to the "Manual operation local ‑ input
controlled" mode. Control by means of a higher-level con‐
trol (e.g. PLC) is not possible.
• Activate on bus error (factory setting)
On failure of the bus connection or a CPU stop, the 3RW51
Soft Starter switches from the "Automatic" mode to the
"Manual operation local - input controlled" mode or
the 3RW51 Soft Starter remains in the operating mode
"manual - local" mode.
• No change on bus error
On failure of the bus connection or a CPU stop the master
control function does not switch, but the 3RW51 Soft
Starter remains in the current mode.
Functions
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