Level 0 – Field Instrumentation Layer

• This layer represents all physical devices installed in the plant. These instruments are directly wired to Level-1 I/O modules.

• Pressure, Temperature, Flow, Level Transmitters
• Control Valves and Solenoids
• Limit Switches and Proximity Sensors
• Relays, Starters and Motors
• Other analog (4–20 mA) and digital field devices

• Collect raw process signals and pass them to SAKSHAM or SIEMENS I/O racks.

LEVEL-1 — I/O Processing and Interface Layer

• SAKSHAM I/O Racks + SIEMENS I/O Racks + Communication Modules
• This layer converts physical signals into usable industrial communication data.

• Interface Modules, AI/DI, AO/DO cards
• Communicate with S7-1500 using PROFINET
• Internal S800 Bus support
• PN/IO couplers for distributed I/O

• S700 and S800 industrial-grade modules
• Communicate with SAKSHAM CPU using SGD Bus
• Support Interface Modules:
  S651-2010E(MB)MOD1
  S651-2001E(MB)MOD1

• PROFINET (SIEMENS side)
• OPC-UA Server (SAKSHAM CPU)
• AS-Network / Industrial Ethernet

• Act as the intermediary between field instruments and Level-2 control systems.
• Digitizes plant signals into reliable structured data.

LEVEL-2 — Control, Monitoring and Supervisory Layer

• SIEMENS PLC + WinCC SCADA + SAKSHAM OPC-UA
• This is the highest layer where logic, visualization, and supervision occur.

• Central control processor
• Receives I/O from SIEMENS racks
• Executes logic, interlocks, alarms
• Communicates via PROFINET / AS-Network

• Supervisory interface for entire plant
• Shows data, alarms, trends, controls
• Access via:
  • SIEMENS PLC (PROFINET)
  • SAKSHAM CPU (OPC-UA)

• Works parallel to SIEMENS PLC
• Provides OPC-UA open connectivity
• Allows SCADA/MES/3rd-party access

• Control operations, visualize plant data, support diagnostics and reporting.