Terms

Cold start

• A cold start is performed by switching power OFF/ON if no battery is connected.
• All RAM memory modules are checked and erased.
• If no user program is stored in the Flash EPROM, the default values (as set on delivery) are applied to the interfaces.
• If there is a user program stored in the Flash EPROM, it is loaded into RAM.
• The default operating modes set by the PLC configuration are applied.

Warm start

• A warm start is performed by switching power OFF/ON with a battery connected.
• All RAM memory modules are checked and erased except of the buffered operand areas and the RETAIN variables.
• If there is a user program stored in the Flash EPROM, it is loaded into RAM.
• The default operating modes set by the PLC configuration are applied.

RUN -> STOP

• RUN -> STOP means pressing the RUN key on the PLC while the PLC is in RUN mode (PLC display “run”).
• If a user program is loaded into RAM, execution is stopped.
• All outputs are set to FALSE or 0.
• Variables keep their current values, i.e., they are not initialized.
• The PLC display changes from “run” to “StoP”.

START -> STOP

• START -> STOP means stopping the execution of the user program in the PLC’s RAM using the menu item “Online/Stop” in the programming system.
• All outputs are set to FALSE or 0.
• Variables keep their current values, i.e., they are not initialized.
• The PLC display changes from “run” to “StoP”.

Reset

• Performs a START -> STOP process.
• Preparation for program restart, i.e., the variables (VAR) (exception: RETAIN variables) are set to their initialization values.
• Reset is performed using the menu item “Online/Reset” in the programming system.

Reset (cold)

• Performs a START -> STOP process.
• Preparation for program restart, i.e., the variables (VAR) (also RETAIN variables) are set to their initialization values.
• Reset (cold) is performed using the menu item “Online/Reset (cold)” in the programming system.

Reset (original)

• Resets the controller to its original state (deletion of Flash, SRAM (%M, RETAIN), Communication Module configurations and user program!).
• Reset (original) is performed using the menu item “Online/Reset (original)” in the programming system.

STOP -> RUN

• STOP -> RUN means pressing the RUN key on the PLC while the PLC is in STOP mode (PLC display “StoP”).
• If a user program is loaded into RAM, execution is continued, i.e., variables will not be set to their initialization values.
• The PLC display changes from “StoP” to “run”.

STOP -> START

• STOP -> START means continuing the execution of the user program in the PLC’s RAM using the menu item “Online/Start” in the programming system.
• If a user program is loaded into RAM, execution is continued, i.e., variables will not be set to their initialization values.
• The PLC display changes from “StoP” to “run”.

Download

• Download means loading the complete user program into the PLC’s RAM. This process is started by selecting the menu item “Online/Download” in the programming system or after confirming a corresponding system message when switching to online mode (menu item “Online/Login”).
• Execution of the user program is stopped.
• In order to store the user program to the Flash memory, the menu item “Online/Create boot project” must be called after downloading the program.
• Variables are set to their initialization values according to the initialization table.
• RETAIN variables can have wrong values as they can be allocated to other memory addresses in the new project!
• A download is forced by the following:
  • changed PLC configuration
  • changed task configuration
  • changed library management
  • changed compile-specific settings (segment sizes)
  • execution of the commands “Project/Clean all” and “Project/Rebuild All”.

Online Change

• After a project has changed, only these changes are compiled when pressing the key <F11> or calling the menu item “Project/Build”. The changed program parts are marked with a blue arrow in the block list.
• The term Online Change means loading the changes made in the user program into the PLC’s RAM using the programming system (after confirming a corresponding system message when switching to online mode, menu item “Online/Login”).
• Execution of the user program is not stopped. After downloading the program changes, the program is re-organized. During re-organization, no further online change command is allowed. The storage of the user program to the Flash memory using the command “Online/Create boot project” cannot be initiated until re-organization is completed.
• Online Change is not possible after:
  • changes in the PLC configuration
  • changes in the task configuration
  • changes in the library management
  • changed compile-specific settings (segment sizes)
  • performing the commands “Project/Clean all” and “Project/Rebuild All”.

Data buffering

• Data buffering, i.e., maintaining data after power ON/OFF, is only possible, if a battery is connected. The following data can be buffered completely or in parts:
  • Data in the addressable flag area (%M area)
  • RETAIN variable
  • PERSISTENT variable (number is limited, no structured variables)
  • PERSISTENT area (%R area)
• In order to buffer particular data, the data must be excluded from the initialization process.