DRAFT - 11 December 2014DRAFT - 11 December 2014INM MTL4850_54 Rev4 9+24VD5SW1HARTADDRESS2 8 32D2D4 D6R2D3R1D1SKT 1FS1FUSEFS2FUSER3R40VPWR2PWR10.5A-m0.5A-mCH1-32 CH33-64CH1-16CH17-32CH49-64CH33-48PWR1PWR24 16SYSCONN. IDENTDATECODELABEL HMP-HM64P4 P3P2 P1RS4851 2BA B C A CRS485 A RS485 BONMTL4850 MTL4850RS485CommsNOTEThe standard MTL ribbon cables usedbetween the HMP-HM64 and the individualboards are suitable only for in-cabinet use.Any cables used outside of the cabinet orunder control room floors would need toprovide additional screening and greatermechanical protection.However, this is normally unnecessary as, tomaintain integrity, each group of cabinetswould communicate their HART signals viaindependent MTL4850/54 modules using theRS485 interface.FIELD BPHM64HARTINTERFACESYSTEMTx2+Ch2+Ch2- Ch1-Ch1+Tx1+Ch1-Ch1+Tx1+ Tx2+Ch2-Ch2+HCU16151311917351614121028461513119173516141210284616chHARTinputs oroutputs16chHARToutputs(filtered)HARTHARTDCSterminalsDCSterminalsDCSterminals16 ch to DCSanalogue input/outputDCSHART16ch I.S.4-20 mAanalogue+ HARTsignals+ 16ch68734512TB878645312TB787564123TB638574612TB5FIELD SYSTEM143578621435786214357862TB4TB3TB28567342TB11HCU16AOHCU16HMP-HM64Figure 4.5 HMP-HM64 connections