SSP Safety Simplifier, Руководство пользователя

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SSP North AB 30/08/2018 Manual V2f
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13.10 Designing systems with Radio or CAN communication
13.10.1 Radio and CAN communication safety Notice
Since neither CAN nor radio are 100% reliable ways of communication (a CAN cable can be cut off or
disconnected at any time, a radio link can be disrupted by radio interference, or a node can simply
lose power and stop communicating), the safety applications that use these types of communication
must be developed with these problems in mind. Loss and return of radio communication must be
considered the same as loss and return of power, and therefore must always result in all affected
outputs and equipment going to safe state. Simplifier Manager helps to prevent some common errors
when programming, but it is ultimately up to the developer to follow these principles when
programming and installing the system. The following chapters discusses how to program systems
that communicate via radio or CAN, and the most common errors and how to avoid them.
Illustration 13.43: An E Stop block with the comment property set to "E Stop
button position 1".