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STAHL 944015-01-11
Model: 944015-01-11 (catalogued as 9440/15-01-11)
Product Name: IS1+ CPU and Power Module for Intrinsic Safety Remote I/O
Product Introduction: This module works as the central processor and power distributor for IS1+ remote I/O stations. It manages communication with the host control system, supplies intrinsic safety power to connected I/O modules, and supports redundant operation in hazardous process plants.
Detailed content
Technical Specifications:
- Input Power: 24 V DC, operating range 20 to 35 V DC
- Controlled I/O Capacity: Up to 16 IS1+ I/O modules
- Fieldbus Communication: PROFIBUS DP V0/V1 with HART transparency, Modbus RTU over RS-485
- Service Bus: FDT/DTM asset integration and diagnostics
- Redundancy: CPM redundancy, optical ring support
- Isolation Rating: Up to 250 V insulation withstand for relevant circuits
- Operating Temperature: -20°C to +65°C
- Protection Rating: IP30 enclosure, IP20 terminal connections
- Hazardous Area Certification: ATEX/IECEx/ FM context, Ex ec [ia, ib Gb] IIC T4 Gc; suitable for Zone 2/Division 2 and interfacing Zone 1/Zone 0 field circuits per system design
Functional Features:
- Real-Time Diagnostics: Bus frame errors, power voltage, current consumption, redundancy status
- Hot Engineering Support: Parameterization without stopping active control loops through ServiceBus
- Compact Footprint: Combines CPU, power supply and fieldbus interface in one station controller
Application Scenarios:
- Oil and Gas: Offshore platforms, FPSO skids, gas treatment plants
- Petrochemical: Zone 2 control rooms and field-mounted I/O clusters
- Marine Automation: Shipboard process control and hazardous-area signal aggregation
- Chemical Plants: Redundant remote I/O for continuous process control
Structural Characteristics:
- Mounting: IS1+ BusRail mounted controller/power unit
- Interfaces: 9-pin Sub-D RS-485 service and fieldbus ports, BusRail power/signal connectors
- Enclosure: Industrial plastic/metal hybrid remote-I/O housing with DIN/rail system integration
Working Principle: The CPU polls configured IS1+ I/O modules, converts field signals into digital process data, performs redundancy voting and diagnostics, and transfers data to the DCS/PLC over PROFIBUS or Modbus. Intrinsic safety power is regulated on the BusRail so field transmitters remain within Ex energy limits.
Installation Requirements:
- Install only on verified IS1+ BusRail with correct power budgeting.
- Provide 24 V DC auxiliary supply sized for all connected I/O modules.
- Verify cable separation between intrinsic safety and non-intrinsic safety circuits.
- Confirm zoning, gland selection and earthing before energizing.
Usage Precautions:
- Do not plug or unplug the module from BusRail while energized in a gas-containing area.
- Do not exceed 35 V DC supply.
- Perform HART/PROFIBUS parameter backup before replacement.
- Inspect Sub-D connectors for oxidation and pin damage during preventive maintenance.
