Allen-Bradley 1746-IO12DC – SLC 500 Digital I/O Combination Module

The Allen-Bradley 1746-IO12DC is an SLC 500 digital I/O combination module. Specifically, this module provides six inputs and six outputs in a single unit. The inputs operate at 10-30 Volts DC. The outputs are relay contacts for AC or DC loads. Furthermore, this module installs in any SLC 500 chassis slot except slot 0. Consequently, it saves panel space by combining both I/O types in one module.

Ordering Configuration and Product Identification

• Manufacturer: Rockwell Automation.

• Brand: Allen-Bradley.

• Part Number: 1746-IO12DC.

• Series: SLC 500.

• Module Type: Digital I/O Combination Module.

• Inputs: 6 total.

• Outputs: 6 total.

• Applications: Combination 24 Volts DC I/O.

• Chassis Location: Any slot except slot 0.

• Therefore, the Allen-Bradley 1746-IO12DC offers flexible installation in SLC 500 systems.

Input Specifications

• Number of Inputs: 6 inputs.

• Operating Voltage Range: 10 to 30 Volts DC.

• Input Configuration: 6 points per common.

• Signal Delay (ON state): 35 milliseconds typical.

• Signal Delay (OFF state): 45 milliseconds typical.

• Input Compatibility: 24V DC sinking or sourcing sensors.

• Backplane Current (Input Side): Included in overall consumption.

• Thus, the 1746-IO12DC accepts standard 24V DC field devices.

Output Specifications

• Number of Outputs: 6 relay contact outputs.

• Output Type: Normally-open (N.O.) contacts.

• AC Operating Voltage Range: 5 to 265 Volts AC.

• AC Frequency Range: 47 to 63 Hertz.

• DC Operating Voltage Range: 5 to 125 Volts DC.

• DC Frequency Range: 47 to 53 Hertz.

• Current per Output (120 VAC): 1.5 amps maximum.

• Current per Output (24 VDC): 1.2 amps maximum.

• Maximum Current per Point: 2 amps total.

• Maximum Apparent Output Power: 28 VA.

• Power Dissipation per Output: 1.84 Watts.

• Output Configuration: 6 points per common.

• Consequently, the Allen-Bradley 1746-IO12DC switches both AC and DC loads directly.

Backplane Current Consumption

• Backplane Current (5V DC): 80 milliamps (0.08A).

• Backplane Current (24V DC): 60 milliamps (0.06A).

• Total Heat Dissipation (Module): 3.9 Watts.

• Operating Voltage for Logic: Supplied from backplane.

• Field Power: External supply required for inputs and outputs.

• Therefore, the 1746-IO12DC draws moderate power from the SLC 500 backplane.

Temperature and Environmental Ratings

• Operating Temperature Range: 0°C to 60°C (32°F to 140°F).

• Storage Temperature Range: -40°C to 85°C (-40°F to 185°F).

• Operating Humidity: 5% to 95% non-condensing.

• Operational Shock: 30G rating.

• Operational Vibration: 2.5G at 57 to 200 Hz.

• Noise Immunity: NEMA standard ICS 2-230.

• Certifications: C-UL and CSA approved.

• Thus, the Allen-Bradley 1746-IO12DC withstands typical industrial environments.

Installation Guide

First, verify that SLC 500 system power is completely disconnected. Then, select an available I/O slot for the Allen-Bradley 1746-IO12DC. Do not use slot 0, as this is reserved for the processor or special modules. After that, slide the module into the chosen slot. Push firmly until the backplane connector is fully seated. Next, connect your 24V DC field devices to the 6 input terminals. The input voltage range is 10-30V DC, so 24V DC is ideal. Then, connect your AC or DC loads to the 6 relay output terminals. For AC loads, ensure voltage is between 5-265V AC at 47-63 Hz. For DC loads, ensure voltage is between 5-125V DC at 47-53 Hz. Then, apply external field power to the input and output commons. Subsequently, apply backplane power by turning on the SLC 500 system. Finally, test each input and output using your control program. As a result, the Allen-Bradley 1746-IO12DC will provide reliable digital I/O functionality.

Packaging List

• One Allen-Bradley 1746-IO12DC digital I/O combination module

• One removable terminal block (installed)

• One product identification label

• One installation and wiring guide

• One I/O assignment sheet

Common FAQs

Q1: How many inputs and outputs does the 1746-IO12DC provide?
A: This module provides six inputs and six outputs. Specifically, the inputs operate at 10-30 Volts DC. The outputs are relay contacts for AC or DC loads. Therefore, it combines both I/O types in a single slot.

Q2: What is the output current rating for the Allen-Bradley 1746-IO12DC?
A: At 120 VAC, the maximum current per output is 1.5 amps. At 24 VDC, the maximum current per output is 1.2 amps. The maximum current per point is 2 amps total. Consequently, derating may apply for high-duty cycles.

Q3: What is the signal delay for the inputs on the 1746-IO12DC?
A: The input signal delay is 35 milliseconds for the ON state. The OFF state delay is 45 milliseconds. Therefore, this module suits applications that do not require high-speed response.

Q4: Can the outputs switch both AC and DC loads on the same module?
A: Yes, each output is an isolated relay contact. However, all six outputs share a common terminal. Therefore, all outputs must use the same voltage type (all AC or all DC) unless external isolation is provided.

Q5: What certifications does the Allen-Bradley 1746-IO12DC hold?
A: This module is C-UL and CSA certified. It also meets NEMA standard ICS 2-230 for noise immunity. Therefore, it complies with North American industrial safety standards.