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Phone: +86 16626708626Description
Key Technical Specifications
- Catalog Number: 1734D-IB8XOB8E
- Manufacturer: Allen-Bradley
- Product Family: POINTBlock I/O
- Module Type: 8-input / 8-output digital I/O block
- Input Count: 8
- Output Count: 8
- Input Type: 24 VDC sinking
- Output Type: 24 VDC sourcing
- Communication: DeviceNet
- Mounting: DIN rail
- Field Power: 10-28.8 VDC
- Expansion Capacity: Up to 12 POINT I/O expansion modules
Product Introduction
The Allen-Bradley 1734D-IB8XOB8E is a POINTBlock combination I/O module with 8 digital inputs and 8 digital outputs. It uses DeviceNet communication and DIN-rail mounting for distributed I/O in compact control panels.
It is a practical replacement part when a site already uses POINT I/O architecture and needs the exact 1734D combination block. The 24 VDC field power range and expansion capability make it useful in mixed I/O panels, but the exact wiring and termination style should be checked before installation.
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No network communication | DeviceNet power, baud rate, node address, or trunk wiring fault | ✅ High | Measure DeviceNet voltage and verify node settings | Check the network first; do not replace the block too early |
| Inputs stay OFF | Missing 24 VDC field supply or wrong sensor wiring | ✅ High | Measure 10-28.8 VDC at the input common and sensor side | Verify field power and input commons |
| Outputs never energize | Output supply missing or load wiring open | ✅ High | Measure output supply and test a known-good load | Check supply, fuses, and output commons |
| Only one channel fails | External device or channel wiring issue | ⚠️ Medium | Move the field wire to a known-good channel | If the fault follows the wire, the block is probably fine |
| All I/O drops out intermittently | Loose terminal block, bad 24 VDC supply, or trunk instability | ✅ High | Wiggle-test terminals and monitor supply voltage | Tighten connections and stabilize power before swapping hardware |
| Module LED is red | Internal fault or communication mismatch | ✅ High | Read device status and compare with the scan list | Confirm address, baud rate, and module configuration |
If you are stuck, send photos of the module LEDs, wiring, and DeviceNet scan data to technical support.
1734D-IB8XOB8E
1734D-IB8XOB8E
1734D-IB8XOB8E
Frequently Asked Questions
Q: What exactly is the 1734D-IB8XOB8E?
It is an Allen-Bradley POINTBlock I/O module with 8 digital inputs and 8 digital outputs on DeviceNet.
Q: Is this the same as a standard 1734 POINT I/O slice?
No. This is a POINTBlock-style device, not a plain slice module. The architecture and wiring style are different, so do not assume interchangeability.
Q: What voltage does it use?
The field side runs on 10-28.8 VDC, with 24 VDC as the nominal value.
Q: Can I replace it with a similar 1734D block?
Maybe, but only if the exact input/output mix, communication interface, and termination style match. I would not swap it from memory.
Q: Is this part obsolete?
Yes, it is commonly treated as an obsolete or limited-stock item. That is why surplus and refurbished units show up more often than factory-new stock.
Q: What should I check before ordering?
Check the full catalog number, the input/output type, DeviceNet requirements, and the terminal style. Also verify whether your site uses the IB8XOB8E or the spring-clamp IB8XOB8ES version.
