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IEC/TR 61131-4 Ed. 2.0 en:2004
Programmable controllers - Part 4: User guidelines
introduces the end-users of Programmable Controller (PLC) to the IEC 61131 series, and to assist the end-users in their selection and specification of their PLC equipment according to the IEC 61131 series. This user guideline has as its main audience PLC end-users.
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International Electrotechnical Commission [iec]