Allen-Bradley 1794-ASB Remote I/O Adapter

Allen-Bradley 1794-ASB Remote I/O Adapter 

Core Technical Specifications

• Brand: Allen-Bradley
• Model: 1794-ASB
• Product Type: Remote I/O (RIO) Communication Adapter
• I/O Module Capacity: Supports up to 8 Flex I/O modules
• Nominal Input Voltage: 24 Volts DC
• Input Voltage Range: 19.2 - 31.2 VDC
• Max External Supply Current: 450 mA at 24V DC
• Communication Protocol: Remote I/O (RIO)
• Data Transfer Speeds: 57.6Kbps, 115.2Kbps, 230.4Kbps
• RIO Cable: Belden 9463 or equivalent
• Communication Port: One (1) RIO port

Compatibility & Data Exchange

• Compatible Controllers: PLC-2, PLC-3, PLC-5, SLC 500, and modern Logix platforms.
• Data Transfer Method: Uses Block Transfer Read (BTR) and Block Transfer Write (BTW) instructions.
• Backplane Power: Internal supply converts 24VDC to 5VDC for module power.
• Critical Note for Analog: Use a 1794-ASB Series D or later module for safe state recognition with FLEX Integral analog modules.
• I/O Point Support: Capable of using thirty-two point FLEX I/O units.

Physical & Environmental Ratings

• Mounting: Standard DIN Rail mount.
• Enclosure Rating: IP20, Open Type (requires a protective cabinet).
• Operating Temperature: 0 to 55 °C (32 to 131 °F)
• Storage Temperature: -40 to 85 °C (-40 to 185 °F)
• Power Dissipation: 4.6 W @ 31.2V DC
• Thermal Dissipation: 15.7 BTU/hr @ 24V DC
• Vibration: 5g @ 10-500Hz (per IEC 68-2-6)
• Operating Shock: 30g peak acceleration
• Dimensions: Approximately 4 x 2 x 4 inches.
• Weight: 0.38 lbs (0.17 kg)

Frequently Asked Questions (FAQ)

• Q: Is the 1794-ASB adapter still new and genuine?
  A: Yes, we supply authentic, brand new Allen-Bradley modules, often as new old stock for legacy system support.
• Q: Which Allen-Bradley controllers work with this adapter?
  A: The 1794-ASB is compatible with legacy PLC-2/3/5 and SLC 500 controllers, as well as modern Logix platforms via adapters.
• Q: What is the maximum communication speed?
  A: This adapter supports a maximum data transfer rate of 230.4 Kilobits per second (Kbps).
• Q: Why is the series letter (A/B/C/D/E) important?
  A: For configurations using FLEX Integral analog modules, you must use Series D or later (e.g., 1794-ASBD) for proper safe state data recognition.
• Q: Does it need an external enclosure?
  A: Yes. The adapter has an IP20 open-type enclosure and must be installed inside a protective industrial cabinet.
• Q: What is your shipping policy for this item?
  A: In-stock items ship within 5 days via major carriers, backed by our 30-day return guarantee.

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