The AC 800M family does also include IEC 61508-SIL3 certifiedcontrollers PM857, PM863, PM865 and PM867, which supports controller configurations for:• Safety application• Combined Process Automation and Safety applicationFor updated information regarding System 800xA hardwareplease visit our 800xA Hardware Selector. In the selector youcan compare different communication modules, AC 800Mcontrollers, S800 IO modules, module termination units,800xA networks equipment, power supplies and voters, panels and also print your own PDF files. 

Features / CPUs PM851A PM856A PM857 PM858 PM860AArticle number 3BSE066485R1(PM851AK01)3BSE066490R1(PM856A)3BSE088385R1(PM857K01)3BSE088386R1(PM857K02)3BSE082895R1(PM858K01)3BSE082896R1(PM858K02)3BSE066495R1(PM860AK01)Processor Unit PM851AK01 incl:1 PM851A CPU andrequired optionalitemsPM856AK01 incl:1 PM856A CPU andrequired optionalitemsPM857K01 incl:1 PM857 CPUand requiredoptional itemsPM857K02 incl:2 PM857K01PM858K01 incl:1 PM858 CPU andrequired optionalitemsPM858K02 incl:2 PM858K01PM860AK01 incl:1 PM860A CPU andrequired optionalitemsOptional items(partly included in ProcessorUnits, see Price List)TP830 Baseplate, TP850 CEX-bus term., TK850 CEX-bus cable, TB807, Modulebus term, Battery RAM backup, TB852/TB853 RCU-link term, TB851/TB855/TB856 RCU-link cable, SB822 External Battery Unit, TK212A Tool cable, TC562 ShortDistance Modem, TK853V020 Modem cable, BC810K02, BC820K02, CEX-bus Interconnection unit; TK851V010 Connectioncable, SD831/SD832/SD833/SD853/SD854 Power Supply, SS832 Voting Unit, Mains Breaker Kit, SM811 SupervisoryModule and SM812 Supervisory Module.High Integrity Controller No No Yes No NoClock frequency 24 MHz 24 MHz 96 Mhz 33 MHz 48 MHzMemory (RAM) 8 MB 8 MB 32 MB 16MB 8 MBFrom 5.1 FP4 12 MB 16 MB 16 MBRAM available for application 2.282 MB 2.282 MB 22.184 MB 7.147 MB 2.282 MBFrom 5.1 FP4 6.253 MB 10.337 MB 10.346 MBProcessor type MPC860 MPC860 MPC866 MPC866 MPC860.