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4.6.5 Safe I/O system rules and limitations
General rules and limitations
• Signal names must be unique.
• Signals must have a name.
• Offsets do not have to have a corresponding signal, for example it is OK to
only define offset 1, 7, and 63 as signals.
• Each signal is assigned a default value which is given at startup.
• Each signal, and equivalent alias, can have at most one writer.
• Each signal can have any number of readers.
• PROFIsafe devices does not have to have all offsets connected to a signal.
• Each devices input and output has a limit of 2048 signals.
Rules and limitations of combinatory logic
• A maximum of 100 combinatory logic operators for each level are allowed,
not counting
NOT .
• In some cases the configurator creates operators which are not shown to
the user, for example in case of more than 8 operands to an AND function.
These additional operators are also counted from the limit of 100.
108 Application manual - Functional safety and SafeMove2
3HAC052610-001 Revision: P
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4 The Visual SafeMove user interface in RobotStudio
4.6.5 Safe I/O system rules and limitations