Safety-Related Area: General Information
| Note
Term definition: Standard = non-safety-related The term "standard" always refers to non-safety-related items/objects. Examples: a standard process data item is only read/written by a non-safety-related I/O device, i.e., a standard device. Standard variables/functions/FBs are non-safety-related data. The term "standard controller" designates the non-safety-related controller. |
- The safety-related controller itself is protected by a controller password. Writing data to the Safety PLC or switching its operation mode is only possible after entering the Safety PLC password in PLCnext Engineer.
- On engineering side (in PLCnext Engineer), a project password enables safety-related editing of the PLANT, the COMPONENTS area, code and variables. Safety-related parts of the project can only be edited while being logged on to the so-called Safety-related Area. This is an area of responsibility restricted to authorized members.
You log on to the Safety-related Area by entering the respective project password in PLCnext Engineer. Refer to the sections below.
| Note
No password is required for displaying safety-related data (code, parameters) in read-only mode. |
Possible operations in the Safety-related Area
While you are logged on to the Safety-related Area, the following operations are possible in PLCnext Engineer:- Insert safety-related devices into the PLANT.
In the PLANT, safety-related devices are indicated by the
overlay icon. - Parameterize and edit properties of safety-related device instances in the PLANT.
- Create the safety-related program 'S_Main' (if not automatically inserted by a project template) and safety-related function blocks in the COMPONENTS area ('Local' folders).
In the COMPONENTS area, safety-related POUs are indicated by the overlay icon. - Edit code and variables of safety-related user POUs.
- Edit the Data List of the Safety PLC.
You can create new and edit existing variables (safety-related and standard data types). This includes the creation of exchange variables in both the Data List of the controller and the Safety PLC.In the Safety PLC Data List, the Role Picker allows the following assignments:- safety-related I/Os: map safety-related variables to safety-related process data items.
- standard I/Os: map standard (non-safety-related) Safety PLC variables to standard process data items.
- exchange variables: map standard (non-safety-related) variables of the Safety PLC to variables of the controller for exchanging data between the safety-related and the standard part of the application.
- HMI tags can only be created for exchange variables in the Safety PLC Data List.
Note
The runtime configuration of the Safety PLC is predefined and cannot be edited. The Safety PLC allows exactly one task in which exactly one program instance ('S_Main') is executed. The program instance can neither be deleted nor edited and only a few task properties can be modified. (Other safety-related programs may be available in the COMPONENTS area but they are not executed.) Refer to the topic "Safety PLC Runtime Configuration" for details.
