Plant Floor OT/IT Network

flowchart LR
  subgraph L01[Level 0-1: Cells]
    C1[Cell 1: PLCs, robots]
    C2[Cell 2: PLCs, drives]
    SW1[Industrial switches]
  end
  subgraph L2[Level 2: Supervisory]
    SCADA[SCADA]
    HMI[HMIs]
  end
  subgraph L3[Level 3: Site operations]
    MES[MES]
    HIS[(Historian)]
    ENG[Engineering workstations]
  end
  subgraph DMZ[Level 3.5: Plant DMZ]
    PATCH[Patch server]
    JUMP[Remote access jump host]
    REP[(Historian replica)]
  end
  subgraph IT[Level 4-5: Corporate]
    ERP[ERP]
    NET((Internet))
  end
  C1 --- SW1
  C2 --- SW1
  SW1 --- SCADA
  SCADA --- HMI
  SCADA --- MES
  MES --- HIS
  ENG --- SCADA
  HIS --- FW1{{Firewall}} --- REP
  FW1 --- PATCH
  FW1 --- JUMP
  REP --- FW2{{Firewall}} --- ERP
  FW2 --- NET