Allen-Bradley 1756-OB8I – High-Precision Isolated DC Output Module
12-month warranty | Ships via FedEx/UPS/DHL | Isolated outputs for sensitive applications
- ✅ 8 fully isolated DC outputs (no shared commons)
- ✅ Handles 10-30V DC with 2A surge capacity
- ✅ Individual channel protection (no fuses needed)
- ✅ Download technical manual for wiring diagrams
Key Features
- 1756-OB8I delivers 2A per point (16A total)
- Works with 12-24V DC systems (10-30V range)
- 250V isolation between channels
- Fast response: 1ms ON/OFF switching
- Fits all ControlLogix 1756 chassis
Technical Specifications
| Brand/Model: | Allen-Bradley 1756-OB8I/A (full suffix) |
| Output Type: | Isolated DC (sourcing) |
| Voltage Range: | 10-30V DC |
| Current per Point: | 2A continuous (4A surge for 10ms) |
| Isolation: | 250V AC between channels |
| Power Consumption: | 4.6W max @ 140°F |
| Terminal Blocks: | 1756-TBCH or 1756-TBS6H (sold separately) |
Installation Notes
- Use 36-pin RTB (1756-TBCH/TBS6H)
- Ground chassis before installation
- Allow 1ms settling time between state changes
- Configure in Studio 5000 or RSLogix
Warranty & Support
Backed by a 12-month replacement guarantee. Includes free technical support.
Professional FAQs
Q: Can I parallel outputs for higher current?
A: No – each output is independently isolated.
Q: Does this work with PLC-5 systems?
A: Only compatible with ControlLogix platforms.
Q: What’s the minimum load requirement?
A: 2mA per channel to maintain signal integrity.
Q: Can I use this for PWM applications?
A: Yes, supports up to 1kHz switching.
Q: Is external power required?
A: Yes – requires 10-30V DC field power supply.
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