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Allen Bradley 1746-OB32 32 Point 24V DC Sourcing Configuration Digital Output Module
Allen Bradley 1746-OB32 32 Point 24V DC Sourcing Configuration Digital Output Module
32 Point Digital Output Module
24V DC SLC 500 Module
Sourcing Configuration 1746-OB32
Place of Origin:
USA
Brand Name:
Allen Bradley
Model Number:
1746-OB32
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Product Details
Product Model:
1746-OB32
Product Parameters:
SLC 32 Point Digital Output Module
Country Of Origin:
USA
Place Of Shipment:
Xiamen, China
Manufacturer:
Allen Bradley
Packaging:
Original New Packaging
MOQ:
1 Piece
Shipping:
TNT, DHL, FedEx, EMS, UPS
Highlight:
32 Point Digital Output Module
,24V DC SLC 500 Module
,Sourcing Configuration 1746-OB32
Payment & Shipping Terms
Minimum Order Quantity
1
Price
66USD
Packaging Details
Brand new and original
Delivery Time
2-3 work days
Payment Terms
T/T
Supply Ability
in stock
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Product Description
The 1746-OB32 is an Allen-Bradley digital output module designed for use with SLC 500 control systems. This high-density, low-current module provides 32 DC output points and can be installed in any available slot of a 1746 chassis (excluding slot 0). Operating with a sourcing configuration, it delivers 24 volts DC output with sixteen points per common grouping.
The module supports an output voltage range of 5 to 50 volts DC and requires 0.19 amps at 5 volts DC from the backplane. Output circuits are isolated and tested at 1500 volts AC for one minute, ensuring reliable performance in industrial environments.
Typical Applications
This module is commonly used to drive discrete field devices including pilot lights, buzzers, horns, sirens, solenoids, and small motors. Devices operating within 5 to 30 volts DC can be wired directly to the outputs. For AC load requirements, interposing relays are typically employed, with 24 V DC relay coils connected to the outputs and relay contacts switching the AC loads.
Interposing relays also provide additional isolation and help mitigate issues caused by electrical noise, grounding problems, or undocumented wiring modifications in older installations.
Technical Questions & Answers
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Q1: Can I pull the full 0.5A rating across all 32 channels simultaneously?
Hard No. You're limited by the 8A module aggregate. If all 32 points are energized, the math drops your max load per point to 0.25A. Exceeding this thermal ceiling leads to localized board warping and "short-to-high" transistor failure. If you have high-draw solenoids, you must interleave the loads or split them across multiple modules.
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Q2: How does the voltage swing from 5V to 50V affect current capacity?
Current capacity is inversely tied to voltage on this module. At 24VDC, you're safe at 0.5A (within the 8A module limit), but at the 50VDC ceiling, you must derate to 0.25A per point. Running 48VDC loads at 0.5A will punch through the transistor junction during high-frequency switching.
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Q3: Will the 190mA backplane draw starve an SLC 500 CPU?
It's a risk in 13-slot racks (1746-A13). A single OB32 pulls 190mA from the 5V rail. If you're packing a rack with these alongside analog cards, you'll likely exceed the capacity of a standard 1746-P1 or P2 power supply. This manifests as intermittent "Bus Sag" and CPU Major Faults. Upgrading to a 1746-P4 is standard practice for high-density digital setups.
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Q4: What's the primary risk of the "16 points per common" banking?
Redundancy loss. Since 32 points share only two commons, a single blown fuse on a supply rail takes out 50% of your I/O. Never wire a lead and lag pump (or primary/backup valves) to the same bank. Split critical outputs between Common 0 and Common 1 to ensure a bank failure doesn't result in a total process crash.
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Q5: How do these sourcing transistors handle inductive kickback?
Poorly. The internal suppression isn't designed for high-cycle DC contactors or solenoids. Without external flyback diodes at the load, the Counter-EMF spikes will eventually degrade the transistor's OFF-state resistance. If an output stays "half-on" (dimly energized) when the PLC is OFF, the junction is already compromised.
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Q6: Why are my LED pilot lights glowing when the output is OFF?
OFF-State Leakage Current. Solid-state outputs never show infinite resistance. There is enough parasitic leakage to trigger high-impedance loads like LEDs or sensitive TTL inputs. The fix is a 10kΩ bleeder resistor in parallel with the load to pull that leakage voltage to ground.
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Q7: Can I terminate 14AWG (1.5mm²) wire into the 1746-N3 connector?
Physically impossible. You cannot fit thirty-two 14AWG conductors into a 3.6cm wide slot and still latch the connector. Use 20AWG or 22AWG thin-wall wire. Also, ensure the loom is zip-tied to the rack frame; the mechanical weight of 32 wires is enough to unseat the module from the backplane under vibration.
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Q8: What's the most common "DOA" issue for Xiamen-origin shipments?
Mechanical pin fatigue. Because the module is so light (0.15kg), it's often handled roughly in transit. Perform a mandatory visual check for backplane pin alignment before insertion. A single bent pin--common from rough handling--can bridge the 5V and 24V rails, which will brick the SLC CPU the second you throw the power switch.
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Why Choose Amikon for Industrial Technology
- Our Bread and Butter: We live and breathe automation. Whether you're running a massive plant or a specialized lab, we're the experts who source PLCs, DCS modules, and HMI panels that keep your operations running smoothly.
- The "Obsolete" Specialists: While major manufacturers push expensive upgrades, we specialize in hard-to-find legacy components, saving you from costly system overhauls.
- Borders Don't Stop Us: Our global network ensures high-end automation equipment is accessible to businesses worldwide.
- The "Vetted" Standard: Every component we sell is sourced from trusted suppliers and rigorously tested before shipment.
Special Offers & Services
- Immediate Shipment: DHL, UPS, FedEx, TNT
- Guaranteed Quality: 12-Month Warranty on all new parts
- Exclusive Pricing: Massive discounts available for a limited time
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Need a price? Drop me a line and I'll get a free quote over to you ASAP.
Best,
Miya Zheng
Manager @ Amikon
WhatsApp: +86 180 2077 6792
Email: sales@amikon.cn
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