Project Settings for an M580 Safety Project in Control Expert

Scope-Specific Project Settings

Select Tools > Project Settings... in the Control Expert main menu to open a window where you can configure and view the project settings for an M580 safety project. Project settings are divided into three groups, depending on the applicable Scope of the settings, as follows:

common: These settings apply to the entire application, and can impact the global, process, and safe areas of the project.
process: These settings apply only to the process area of the project.
safe: These settings apply only to the process area of the project.

This topic describes only those parts of the Project Settings window that vary from an M580 non-safety project. Refer to the Project Settings section of the EcoStruxure™ Control Expert Operating Modes manual for information regarding features that are common to both M580 safety and non-safety projects.

Common Project Settings

The following Scope > common settings apply to the global, safe, and process project areas, but differently from the same settings in an M580 non-safety project:

Group	Setting	Description
General settings:
Build settings	Free data memory (in kbytes)	This setting is disabled. NOTE: In an M580 safety system, the allocation of data is performed dynamically, and a fixed size data block does not need to be reserved.
Build settings	Virtual connected mode	This setting is disabled and de-selected.
PLC embedded data	Data dictionary Usage of Process Namespace	Determines how an operator screen can access and read process namespace variables: If selected, the operator screen can read process area variables only by using the format “PROCESS.<variable name>”. If de-selected, the operator screen can read process area variables only by using the format “<variable name>” without the PROCESS prefix. NOTE: All variables in the safe area are accessed using the format “SAFE.<variable name>”.
PLC embedded data	Optimize data on-line change	Applies to the: Process program in both safety and maintenance operating modes. Safety program only in maintenance operating mode.
PLC diagnostics	Rack Viewer diagnostics information Rack Viewer variable names	Both of these settings are available to both process and safety variables.
PLC diagnostics	Program Viewer information	This setting is available for both process and safety code sections.
Time	Time Stamping Mode	This setting is available for both process and safety programs, with the exception that time stamping for safety variables is not supported.
Operator Screen settings:
Controlled Screen	Displaying screens controlled via the PLC	This setting is available in the M580 safety PAC for the selected variable.

Common Project Settings that do not affect the Safe Area of the Project

The following Scope > common settings apply to the process program, but not to the safety program in an M580 safety project:

Group	Setting	Description
General settings:
PLC Behaviour	Reset %M on Stop->Run transition	LL984 code sections are not supported in the safety program.
Configuration	M580 preferred I/O data type (Local I/O)	Only the device DDDT data type is available for safety I/O modules.
Variables settings:
–	Directly represented array variables	%MW access is not supported in the safety program.
	Enable fast scanning for trending	Trending tool is not supported in the safety program. It is supported only in the MAST task of the process program.
	Force references initialization	References are not allowed in the safety program.
Program settings:
Languages Common	Allow nested comments	Supported only for non-safe tasks (MAST, FAST, AUX0, and AUX1).
	Allow multi assignment (a:=b:=c) (ST/LD)	The ST language, which includes the Operate block, is not supported by the safety program. The LD language in the safety program does not support
	Allow empty parameters in non-formal call (ST / IL)	The ST and IL languages are not supported in the safety program.
Languages ST	Allow jump and label	The ST language is not supported in the safety program.

Project Settings that Impact the Process and Safe Project Areas Differently

Both the Scope > safe and the Scope > process present the same collection of program settings. However, the following settings are treated differently in each scope in an M580 safety project

Group	Setting	Description
General settings:
Build settings	Optimized code	Enabled for the process scope. Disabled and de-selected for the safe scope.
Build settings	Safe Signature management	Disabled for the process scope. Enabled and set to Automatic by default, for the safe scope.
PLC diagnostics	Application diagnostics Application diagnostic level	Enabled for the process scope. Disabled and de-selected for the safe scope.
Variables settings:
–	Allow dynamic arrays	These settings are: Enabled for the process scope. Disabled and de-selected for the safe scope. NOTE: Dynamic arrays are not supported for safety program variables.
–	Disable array size compatibility check
Program settings:
Languages	Function Block Diagram (FBD)	Enabled for both the process and safe scopes.
	Ladder (LD)	Enabled for both the process and safe scopes.
	Sequential Function Chart (SFC)	Enabled for the process scope. Disabled and de-selected for the safe scope.
	List (IL)
	Structured Test (ST)
	Ladder Logic 984 (LL984)
Languages Common	Allow subroutines	Enabled for the process scope. Disabled and de-selected for the safe scope. NOTE: Subroutines are not supported in the safety program.
	Usage of ST expressions (LD/FBD)	Enabled for the process scope. Disabled and de-selected for the safe scope. NOTE: ST expressions are not supported in the safety program.
	Enable implicit type conversion	Enabled for the process scope. Disabled and de-selected for the safe scope. NOTE: Implicit type conversions are not supported in the safety program.