System registers

System registers are memory areas reserved for setting hold and non-hold areas for timers, counters, flags and data registers.

In the system registers you can also define parameters for PLC interfaces as to how they should react when errors occur.

NOTE

The size of the memory depends on the PLC type used. The sum of all memory sizes for system registers, user program and machine program may not be larger than the entire PLC memory.
The 2 highest data registers (4 in PLCs with a second task) are at the user’s disposal, since they are always in the hold area and used by the compiler.

Double-click PLC in the navigator.
Double-click System registers

A list with all system registers will be displayed. The number indicated in parentheses is identical to the system register number. In Memory size, you define the memory sizes for machine programs, for example. You will find a list with all system registers and the memory size of your PLC in your hardware description.
Double-click desired set of system registers
Enter your settings

NOTE

Reset the selected system register(s) with Set default value from the context menu.