Product Overview

The 1746-IO12 belongs to the SLC 500 Series. Its product type is a Digital I/O Combination Module. The product classification is I/O Modules. The current price for this item is ¥2,980 RMB, and the product gross weight is 0.38 kg.

Rockwell Automation designed this module under the Allen-Bradley brand for SLC 500 controller platforms. The 1746-IO12 features six (6) 120V AC input channels and six (6) Form A relay output channels (Normally Open contacts). This combination module occupies a single slot in the SLC 500 chassis. Therefore, it provides a cost-effective solution by saving both chassis slots and panel space.

Technical Specifications

Input Specifications

The module provides six (6) 120V AC inputs . The operating voltage range spans 85 to 132 Volts AC . This input functionality is similar to the 1746-IA16 module but with fewer channels. The maximum signal delay for ON state is 35 milliseconds . For OFF state, the maximum delay is 45 milliseconds . Each input point dissipates 0.27 Watts of power.

Output Specifications

The module provides six (6) Form A relay contacts (Normally Open). The output operating voltage range covers 24-125 VDC and 120-240 VAC . Each output at 24 VDC handles 1.2 Amps continuous. Each output at 120 VAC handles 1.5 Amps continuous. The continuous current per module reaches 8.0 Amps total across all outputs. Each output point dissipates 0.133 Watts maximum.

Backplane Current

The backplane current draw at 5 VDC ranges from 70 to 90 mA (0.070 to 0.090A). The current draw at 24 VDC is 70 mA (0.070A). This moderate power consumption allows integration into most SLC 500 chassis power budgets.

Signal Delay

The input and output signals have specific delay characteristics. The maximum ON state delay is 35 milliseconds . The maximum OFF state delay is 45 milliseconds . Consider these delays when designing time-critical control logic.

Thermal Dissipation

The total heat dissipation for the 1746-IO12 reaches 4.60 Watts . This aggregate value includes both input and output power dissipation. Ensure adequate ventilation in your control cabinet to manage this heat load.

Temperature and Humidity

The operating temperature range spans 0 to 60°C (32 to 140°F) . Relative humidity tolerance reaches 5 to 95% without condensation . For storage, the temperature range extends from -40 to 85°C (-40 to 185°F) .

Isolation and Noise Immunity

The module provides electro-optical isolation tested at 1500V between I/O terminals and control logic. Noise immunity meets NEMA standard ICS 2-230 ratings. Therefore, the 1746-IO12 performs reliably in electrically noisy industrial environments.

Vibration and Shock Tolerance

The module withstands functional vibration of 2.5G at 57-200Hz during operation. Shock tolerance reaches 30G operational shock. This rugged construction suits demanding machinery applications.

Area Classification

The 1746-IO12 is certified for Class 1, Division 2 hazardous locations by CSA . This certification allows installation in areas where flammable gases or vapors may be present under abnormal conditions.

Chassis Location

This combination module can be mixed with other SLC 500 product family modules. It installs in expansion or local chassis slots. However, avoid using the slot dedicated to the PLC processor.

Chemical Exposure

Module operation may degrade when exposed to chemicals. Therefore, regular maintenance and loop validation are recommended. These checks determine if the module remains within acceptable operating limits. If significant degradation occurs, replace the module with the same part number. However, only replace modules without active supply power.

Installation Guide

Follow these steps to install your 1746-IO12 correctly.

1. Power Down the Chassis: Disconnect power from the SLC 500 chassis completely. This prevents electrical shock and module damage.

2. Select a Slot: Choose an available slot in the SLC 500 chassis. Avoid the slot dedicated to the PLC processor.

3. Insert the Module: Align the 1746-IO12 with the slot guides. Push firmly until the module seats into the backplane connector.

4. Secure the Module: Tighten the retaining screws at the top and bottom. This secures the I/O combination module in place.

5. Connect Input Wiring: Wire your 120V AC field devices to the six input terminals. Ensure voltage stays within 85-132V AC .

6. Connect Output Wiring: Wire your load devices to the six Form A relay output terminals. Observe proper voltage and current limits.

7. Apply Power: Restore power to the SLC 500 chassis. Verify the module powers up without errors.

8. Test Inputs: Activate each input field device. Confirm that the corresponding input status indicators light.

9. Test Outputs: Energize each output channel from your control program. Verify that each relay closes and the load activates.

Package List

• 1 x 1746-IO12 Digital I/O Combination Module (6 inputs, 6 outputs)

• 1 x Terminal block (pre-installed for I/O wiring)

• 2 x Module retaining screws (pre-installed)

• 1 x Installation instruction manual

Frequently Asked Questions (FAQ)

1. What types of loads can I connect to the relay outputs?
The 1746-IO12 relay outputs work with both AC and DC loads. For 120V AC loads, each output handles up to 1.5A . For 24V DC loads, each output handles up to 1.2A . Outputs also work with other voltages from 5-265V AC and 5-125V DC.

2. Is this module certified for hazardous locations?
Yes, the 1746-IO12 is certified for Class 1, Division 2 hazardous locations by CSA . This certification allows installation in areas with flammable gases or vapors under abnormal conditions.

3. What are the signal delay times for this module?
The maximum ON state delay is 35 milliseconds . The maximum OFF state delay is 45 milliseconds . Therefore, account for these delays when programming time-sensitive control logic.

4. Can I replace this module while the system is powered on?
No, only replace modules without active supply power . Removing or inserting the module with power applied can cause electrical arcing. Arcing may damage the module and adjacent components. Always power down the chassis first.

5. How does this module compare to dedicated input or output modules?
The 1746-IO12 offers a cost-effective solution by combining 6 inputs and 6 outputs in one slot. Dedicated modules like the 1746-IA16 offer more inputs (16) but no outputs. Use the combination module when you need moderate I/O counts and want to save chassis slots.