This is the web edition of the original ‎⮫ AC500-S safety user manual, version 1.3.2. This web edition is provided for quick reference only. The original safety user manual must be used to meet functional safety application requirements.

The following rules must be followed when using addresses for creating safety applications:

• No application of addresses directly in the program code. Each used address must be assigned to a variable with "AT" in the declaration. In addition, we recommend identifying input/output variables through a prefix and defining them together in a single variable list.

• The application of marker addresses (%M) should be limited to a minimum due to the error-proneness of the allocation and the lack of purpose (memory for variables is allocated automatically).

• Multiple address allocation should be avoided due to obscure side effects. For word- and bit-wise access a variable is defined for the word and accessed via bit access <variable>.<bit number>.

• No address declarations within programs, function blocks, functions and data structures.