1734-IM2 Allen-Bradley POINT I/O Digital AC Input Module

1734-IM2 Allen-Bradley POINT I/O Digital AC Input Module

The 1734-IM2 is a 2-point digital AC input module in the Allen-Bradley POINT I/O 1734 series. It reads 220V AC field signals at 47 to 63 Hz. Its small size suits compact racks with few discrete inputs. The keyswitch on the mounting base must sit at position 8. Engineers often pick this module for legacy 220V AC sensing in space-limited panels.

Technical Specifications at a Glance

• Brand: Allen-Bradley
• Model: 1734-IM2
• Series: POINT I/O 1734
• Module type: Digital AC input, 2 non-isolated sink inputs
• Input voltage: 220V AC nominal, 159 to 264V AC range
• Input frequency: 47 to 63 Hz
• On-state current: 6.2 mA at 159V AC to 10.2 mA at 264V AC
• Off-state limits: 43V AC max, 2.9 mA max
• POINTBus current: 75 mA at 5V DC
• Input impedance: 22.3 kΩ nominal
• Power dissipation: 0.48 W max at 264V AC
• Thermal dissipation: 1.63 BTU/hr max at 264V AC
• Isolation: 240V continuous, field side to system
• Operating temperature: -20 to 55°C
• Storage temperature: -40 to 85°C
• Humidity: 5 to 95% non-condensing
• Vibration: 5 g at 10 to 500 Hz
• Shock: 30 g operating, 50 g non-operating
• Weight: about 30.9 g (1.09 oz)
• Dimensions: 2.21 x 0.47 x 2.97 in

Mounting and Wiring Notes

• Set the base keyswitch to position 8 before insertion.
• Use a 1734-TB, 1734-TBS, 1734-TOP, or 1734-TOPS base.
• Wire with 14 to 22 AWG copper, solid or stranded, 75°C rated.
• Mount on DIN rail with an open-type enclosure.
• Check status indicators during commissioning.

Where the 1734-IM2 Fits Best

• Panels with a handful of 220V AC limit switches.
• Legacy machines running 60 Hz AC control circuits.
• Retrofit jobs that keep existing AC pilot devices.
• Compact distributed I/O racks with tight space.
• Systems needing 240V field-to-system isolation.

FAQ

Q: Can I use the 1734-IM2 for 110V AC signals?

A: No. The on-state threshold starts at 159V AC. A 110V signal may not register reliably. Choose a module rated for your actual field voltage.

Q: Why does my module fail to appear in the rack?

A: Check the base keyswitch first. It must be at position 8. A wrong setting blocks proper connection. Also confirm the base is a 1734-TB, TBS, TOP, or TOPS type.

Q: How do I judge if a surplus 1734-IM2 is still good?

A: Ask for on-state and off-state test readings. At 220V AC, expect about 8.5 mA. Check off-state leakage stays under 2.9 mA. A tested unit should come with records.

Q: What wiring mistakes cause the most failures?

A: Wrong wire gauge and poor termination top the list. Stay within 14 to 22 AWG, 75°C copper. Loose strands raise resistance and heat at the terminal.

Q: How should I choose between the 1734-IM2 and a larger AC input module?

A: Count your AC points first. This module gives only 2 inputs. If the panel needs more, a higher-density module saves base slots and wiring time.