Siemens SIMATIC ET 200SP Manual page 32

Parameters/address space
4.3 Substitute value behavior
4.3 Substitute value behavior
Substitute value behavior
The respective output reacts 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)
● Parameter assignment phase during startup
● Deactivation of the IO device
● Station stop
– No server module
– Insertion of invalid I/O modules
– At least one I/O module installed on an incorrect BaseUnit
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 becomes effective in the following cases:
● Firmware update
● Reset to factory settings
● Configuration control:receipt of a new control data record
● Incorrectly configured module
● Module with incorrect parameter assignment
Substitute value behavior for module-internal Shared Output (MSO) and module-internal Shared Input
(MSI)
Substitute value behavior for module-internal Shared Output (MSO) and module-internal
Shared Input (MSI) corresponds to the behavior described above.
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IM 155-6 PN HF interface module (6ES7155-6AU00-0CN0)
Manual, 03/2015, A5E03915895-AF