Hi Martin. You wrote about LVD and PLC's.
Don't lose sight of the fact that the LVD states that the equipment as described should be safe. EN61010 (measurement and control equipment, which may loosely describe PLC's) requires that the equipment should be safe in all interpretations of the word. i.e. that it shouldn't be too heavy, have sharp edges, mustn't be too loud, too smelly, too hot, mustn't fall over, mustn't break, etc. etc.. In short, shouldn't cause damage to people, property or domestic animals. Protection against electric shock is mentioned, but they don't make a big thing of it. I'm not terribly clear as to whether EN61010 is mutually exclusive to EN61131-2, or additional to. I tend to treat them as mutually exclusive, otherwise you'd spend your life chasing standards, and in many cases they are conflicts. <Is there any justification for this organisation to demand this?> Probably not, but if they do they should give you the clauses that you must comply with. If the PLC is used in a machine control system, it should comply with the Machinery Directive, EN60204 is more relevant here. If used in a measurement system, use EN61010. What none of these standards mention is that if you eat a PLC, it shouldn't poison you.... That would be a non-compliance with the LVD! Hmmm. Chris Dupres Surrey, UK.
