Allen-Bradley 1734-485ASC Serial Interface Module

Allen-Bradley 1734-485ASC Serial Interface Module

Core Technical Specifications

• Brand & Manufacturer: Allen-Bradley.
• Series & Model: POINT I/O series, model 1734-485ASC.
• Module Type: Dedicated Serial Interface Module (Key Switch Position 2).
• Electrical Ratings: Operates on 24V DC nominal power (10-28.8V DC range), consuming only 15mA.
• Network Support: Compatible with both 2-wire RS-485 and 4-wire RS-422 standards.
• Noise Immunity: Designed for use with shielded cable to minimize signal disruption from electrical noise.

Installation and Wiring Instructions

• You must use shielded cables for all network connections to ensure signal integrity.
• Ground the cable shield at one end only to avoid creating a ground loop fault.
• The 1734-485ASC terminal block does not have a chassis ground point. Connect the shield directly to the grounded DIN rail.
• Wire the network cables to the clearly marked positions on the 1734-TB terminal block.

Configuration and Operational Data

• The module uses default I/O message and buffer sizes, often set to 20 bytes each.
• You can easily modify these buffer sizes in the configuration file for longer data strings.
• Data flows from a DeviceNet master to the 1734-485ASC module, then to the serial device.
• Transmission triggers after receiving the set byte count or the End-of-String Terminator character.

Frequently Asked Questions (FAQ)

• Q: What is the main function of the 1734-485ASC module?
  A: The 1734-485ASC provides a serial interface to connect RS-232/422/485 ASCII devices to a DeviceNet network.
• Q: How should I handle cable shielding for this module?
  A: Use shielded cable and ground the shield at the DIN rail only. Do not ground both ends or connect to logic common.
• Q: Can I adjust the data buffer size on this POINT I/O module?
  A: Yes, the default is 20 bytes, but you can reconfigure the ASCII buffer size in the software for larger messages.
• Q: What power input does the module accept?
  A: It accepts a 24V DC nominal supply, within a 10-28.8V DC range.

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