L0 · Field / Process I/O
L1 · PLC / Remote I/O
L2 · HMI / SCADA
L3 · Ops / Historian
IEC 62443 · OT / IT FIREWALL BOUNDARY (IDMZ)
L4/5 · Enterprise (via IDMZ)
⬛
Field I/O-1
24 VDC DI/AI
⬛
Field I/O-2
24 VDC DI/AI
PLC-1
(Line A)
EtherNet/IP CIP
PLC-2
(Line B)
EtherNet/IP CIP
Remote I/O
Adapter
8 ms RPI
HMI
Operator HMI
CIP consumer
🖥
SCADA Server
OPC UA + CIP
🗄
Historian
/ Ops Server
OPC UA · NTP
🔥
IDMZ Firewall
IEC 62443 DPI
🏢
Enterprise
/ MES Node
ERP · WAN
Purdue Levels
L0 · Field I/O
L1 · PLC / Remote I/O
L2 · HMI / SCADA
L3 · Ops / Historian
IDMZ / L4-5 Enterprise
Ring active
Standby / blocked
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