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  1. ward267

    Control Systems vs Instrumentation

    I'm looking for a forum for Safety Instrumented Systems. Control system designed to standards such as IEC 61511 and ISA/ANSI S84.01. Know of such a forum or individual contacts. Al Ward, PE (Control Systems Engineering)
  2. ward267

    1oo2D voting

    What does the "D" in 1oo2D refer to ? When is it appriate to attach a "D" to the voting description for two analog inputs to a PLC used as a logic solver in an SIS.

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