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40.8 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.
Procedure
1. Double-click "PLC"
2. 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 (0-3)", 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.
3. Double-click desired set of system registers
4. Enter your settings
40.8.1 Types of system registers
System registers are used to set values (parameters) which determine operation ranges and functions used. Set
values based on the use and specifications of your program. There is no need to set system registers for
functions which will not be used.
Appendix Programming Information
1273
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