Substitute Value Behavior - Siemens IM 155-6 PN ST Manual

Parameters/address space

4.3 Substitute value behavior

4.3 Substitute value behavior
The substitute value behavior in the ET 200SP distributed I/O system is executed by the IO
controller for each slot.
The respective output behaves according to its configured substitute value behavior:
● Current-free/voltage-free
● Output substitute value
● Keep last value
The substitute value behavior is triggered in the following cases:
● STOP controller
● Controller failure (connection interrupted)
● Firmware update
● Reset to factory settings
● Station stop, for example, due to:
– Missing server module
– Removing more than one I/O module at a time.
– At least one I/O module installed on an incorrect BaseUnit
● Deactivating the IO device
Note
Reducing a configuration
If you reduce the configuration of the ET 200SP distributed I/O system and download the
configuration to the CPU, the modules which are no longer configured but still present
retain their original substitute value behavior. This applies until the supply voltage is
switched off at the interface module.
The "current-free/voltage-free" behavior takes effect in the following cases:
● Firmware update
● Reset to factory settings
● Configuration control: The IM has not received a valid control data record 196 yet.
● Incorrectly configured module
● Module with incorrect parameter assignment
26
IM 155-6 PN ST interface module (6ES7155-6AU01-0BN0)
Manual, 04/2017, A5E03576904-AE