Siemens SIMATIC PCS 7 Operating Manual page 161

Operator input
The operation of the Safety Matrix must be enabled in the CFC by a "1" signal at the
EN_SWC input. This can be done by logic or interconnection to the input channel driver of a
key switch. The F-password is also requested in an online mode of the ES. The operator
permissions configured in the Safety Matrix Engineering Tool are required for the operation
of an OS. If password prompting and operator permission adequate for access protection,
you can set the EN_SWC input in the Safety Matrix block permanently to "1" with an
interconnection to the output of an F_NOT block. You can thus prevent a configured "1" from
being overwritten when transferring the Safety Matrix to the CFC.
Compendium Part B - Process Safety (V8.2)
Operating Manual, 07/2016, A5E35031794-AB
Configuration with Safety Matrix
8.1 Creating and configuring a Safety Matrix
161