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Introduction To meet CE Compliance directives, card files, High-Performance Process Manager Module (HPMM) cards, Field Termination Assemblies (FTAs), Power Systems, and cables, namely IOP to FTA cables, power cables, and I/O Link Interface cables, are available and identified either by model number or by the assembly part number. Hardware differences Where applicable, this section describes general differences between the CE Compliant hardware and non-CE Compliant hardware. Also discussed are the hardware combinations and rules that must be considered for CE Compliance. CE Compliant hardware identification Finally, where applicable, each subsection that is devoted to a particular type of hardware identifies the CE Compliant and the non-CE Compliant hardware. Master Reference Ground The use of a Master Reference Ground (MRG), which is separate from Safety Ground, is not acceptable for a CE Compliant installation. References to Master Reference Ground must be ignored and a single Safety Ground must be substituted. CE Compliant installation Only recommended CE Compliant hardware, cabling, and practices must be considered for a CE Compliant installation. Install only a single ground system.