Allen-Bradley 1746-IO12DC Digital I/O Combination Module
Product Introduction
The 1746-IO12DC from Allen‑Bradley is a hybrid I/O module for the SLC 500 platform. It provides 6 digital inputs and 6 relay outputs in a single unit. The inputs accept 10–30V DC, while the outputs handle AC or DC loads. This design saves chassis slots and simplifies wiring for small to medium control systems.
Technical Specifications of the 1746-IO12DC
This module belongs to the SLC 500 series. The six inputs operate from 10–30V DC. Each input shares a common point. The six outputs are relay contacts, normally‑open type. Their voltage range is 5–265V AC (47–63 Hz) or 5–125V DC (47–53 Hz).
Furthermore, the output current rating is 1.5 A at 120V AC and 1.2 A at 24V DC. Maximum current per output point reaches 2A. Apparent output power is 28 VA maximum.
The signal delay measures 35 ms for the ON state and 45 ms for the OFF state. Backplane current draw is 0.08A at 5V DC and 0.06A at 24V DC. Total power dissipation for the module is 3.9W. Each output point dissipates 1.84W.
Mechanical and Environmental Parameters
The 1746-IO12DC operates from 0°C to 60°C (32°F to 140°F). Relative humidity ranges from 5% to 95% (non‑condensing). Non‑operating temperature spans -40°C to 85°C (-40°F to 185°F).
Additionally, it withstands 30G operational shock and 2.5G vibration at 57–200 Hz. Noise immunity meets NEMA standard ICS 2-230. The module carries C-UL and CSA certifications.
Installation Guidelines
You must install the 1746-IO12DC into any SLC 500 chassis slot except slot 0 (reserved for the processor). First, disconnect system power. Next, align the module with the chassis guides and push firmly until seated. Then, tighten the retaining screws. Finally, wire input devices to the input terminals and output loads to the relay terminals according to the label diagram.
Packaging List
1746-IO12DC module (1 unit)
Removable terminal block (attached)
User manual (quick start guide)
Note: No certificate or warranty document is included in the package.
Shipping Methods
We ship worldwide via FedEx, UPS, or DHL. Tracking number provided within 24 hours after dispatch.
Frequently Asked Questions (FAQ)
1. Can I use the 1746-IO12DC in slot 0 of an SLC 500 chassis?
No. Slot 0 is reserved for the CPU. The 1746-IO12DC must be placed in any other slot (1 through the maximum chassis size).
2. What is the difference between the input and output voltage ranges?
Inputs accept 10–30V DC only. Outputs are relay contacts, so they can switch 5–265V AC or 5–125V DC regardless of the input voltage.
3. Are the outputs isolated from each other?
The six outputs share a common contact. They are not individually isolated. For isolated outputs, consider using 1746-OX8 or similar modules.
4. What happens if I exceed 2A per output point?
Exceeding 2A can weld the relay contacts or permanently damage the 1746-IO12DC. Use an external interposing relay for higher current loads.
5. Is the 1746-IO12DC hot‑swappable?
No. The SLC 500 system does not support hot swapping. Always power down the chassis before inserting or removing the 1746-IO12DC.
