Allen-Bradley 1797-BIC 1797 Flex Ex Bus Isolator Module

The 1797-BIC is a Flex Ex Bus Isolator designed for connecting standard Flex I/O modules to Flex Ex modules while maintaining the same I/O group. It supports up to eight Flex Ex I/O modules and is DIN rail mountable, powered by an 18-32 VDC input voltage supply.

General Specifications

• I/O Module Capacity: Supports 8 FLEX Ex modules
• Indicators: Green power LED when active
• Isolation Path:
  • Flexbus to Flexbus: Galvanic (DIN EN 60079-11)
  • Flexbus slave side to power supply: Galvanic (DIN EN 60079-11)
• Power Consumption: 18-32 VDC @ 0.15 A
• Power Source Failure: Max input [U_{m}=253Vac]
• Power Dissipation: 2.1 W
• Thermal Dissipation: [7.2~Bπ U/hr]
• IS Module Type: [Ex ib] IIC
• Wire Size: Max 4 mm² (12 gauge) stranded, 1.2 mm (3/64 in.) insulation
• Weight: Approx. 200 g

Environmental Conditions

• Operational Temperature: -20 to 70 °C (-4 to 158 °F)
• Storage Temperature: -40 to 85 °C (-40 to 185 °F)
• Relative Humidity: 5 to 95% non-condensing
• Shock:
  • Operating: 30 g peak acceleration, 11 (±1) ms pulse width
  • Non-operating: 30 g peak acceleration, 11 (±1) ms pulse width
• Vibration: 5 g @ 10 to 500 Hz per IEC 68-2-6

Output Specifications

Output (Intrinsically Safe)

• CENELEC:
  • Uo < 5.75V DC
  • Io < 400 mA
  • Po < 2.05 W
  • Lo < 100 μH
  • Co < 39 μF
• FM and cULus:
  • Vt < 5.75V DC
  • It < 398.25 mA
  • Ca < 39.67 μF
  • La < 210 μH

Agency Certifications and Approvals

• FM: Non-incendive for Class I, Division 2 Groups A, B, C, and D. Provides intrinsically safe outputs to Class I, Division 1 when installed per Control Drawing No. 1797-RM001.
• UL, C-UL: Associated Apparatus for hazardous locations; Class I, Zone 2.
• INMETRO: [BR-Ex ib] IIC
• EXAM (ATEX): Ex II (2) G [Ex ib] IIC, II (2) D [Ex ibD]
• IECEx: IECEX BVS 09.0025

Marking and Classification

• Directive 2014/30/EU (EMC): CE
• Directive 2014/34/EU (ATEX): II (2) G [Ex ib] IIC, II (2) D [Ex ibD]
• IECEx: [Ex ib] IIC
• IEC Temp Code: T4

Additional Notes

• Up to eight I/O modules can be connected to a 1794 FLEX I/O adapter.
• The total number of 1797 FLEX Ex I/D modules plus 1794 FLEX I/O modules cannot exceed eight in intermixed systems.

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