When designing a control system, where the safety system is to be networked, where would you start? To understand the basis for safe motion control, the first place to look would be the PLCopen safety standard. This would give you a vendor-neutral look at the functionality available to programmers and how to implement it in the control architecture. Most controls engineers are comfortable using the PLCopen standard for the motion functions in a system and may have even written their own functions...
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