Allen-Bradley 1794-IC16 Flex I/O Digital Input Module

Product Overview

The 1794-IC16 comes from Allen-Bradley as a robust digital input module. First, this device belongs to the popular Flex I/O series. Specifically, it provides 16 nonisolated sinking inputs for industrial applications. Therefore, the 1794-IC16 works well for high-voltage DC input signals. You can use this module with a central controller via the Flex I/O backplane. Consequently, it expands your system's digital input capacity for demanding environments. For example, you can connect up to 16 high-voltage sensors to a single module.

Technical Specifications (Voltage Ratings)

The 1794-IC16 operates across a higher voltage range than standard modules. Specifically, the minimum on-state voltage sits at 30V DC. Meanwhile, the maximum on-state voltage reaches 60V DC. This range makes the 1794-IC16 ideal for 48V DC systems. In comparison, many competitor modules only support 24V DC. Moreover, the maximum off-state voltage is 10V DC. Thus, false triggering rarely occurs with this module. As a result, you get reliable signal detection in noisy industrial environments.

Technical Specifications (Current Ratings)

Current handling on the 1794-IC16 is precisely defined for stable operation. First, the minimum on-state current measures 2.0 mA at 30V DC. For typical operation at 60V DC, you get up to 7.0 mA. Meanwhile, the minimum off-state current sits at 1.5 mA. This specification ensures clear differentiation between on and off states. Consequently, the 1794-IC16 delivers accurate input readings every scan. In addition, the Flexbus current draw is only 25 mA at 5V DC. Therefore, this module places very low demand on your backplane power supply.

Technical Specifications (Impedance and Dissipation)

The 1794-IC16 features a nominal input impedance of 11 kΩ. This value optimizes signal processing for your high-voltage field devices. Consequently, you get stable and accurate input readings without excessive current draw. Moreover, the module dissipates up to 6.4 W at 60V DC maximum. Thus, it maintains safety and efficiency during operation. For instance, you do not need extra cooling for this module in most cabinets. The heat dissipation reaches approximately 22 BTU/hour.

Summary of Key Technical Parameters

• Number of Inputs: 16 nonisolated sinking

• Input Type: Sinking (negative logic)

• Minimum On-State Voltage: 30V DC

• Maximum On-State Voltage: 60V DC

• Minimum On-State Current: 2.0 mA at 30V DC

• Maximum On-State Current: 7.0 mA at 60V DC

• Maximum Off-State Voltage: 10V DC

• Minimum Off-State Current: 1.5 mA

• Nominal Input Impedance: 11 kΩ

• Maximum Power Dissipation: 6.4 W at 60V DC

• Flexbus Current: 25 mA at 5V DC

• Isolation Voltage: 1900V DC

• Temperature Code: T3

Environmental and Mechanical Data

The 1794-IC16 shares the same rugged design as other Flex I/O modules. First, it operates in temperatures from 0 to 55 °C (32 to 131 °F). Meanwhile, storage temperatures range from -40 to 85 °C (-40 to 185 °F). The module withstands vibration of 5 g at 10-500 Hz. Additionally, it handles operating shock of 30 g peak acceleration. Therefore, the 1794-IC16 suits harsh factory environments. The module measures approximately 46 x 94 x 53 mm. For reference, it weighs only about 0.26 kg. As a result, installation requires very little panel space. The module carries a T3 temperature code with 2 key switch positions.

Status Indicators and Isolation

The 1794-IC16 includes 16 logic-driven status indicators. Each channel has its own LED for quick visual confirmation. Thus, you can troubleshoot input signals without any programming software. Moreover, the module offers an impressive isolation voltage of 1900V DC. This high isolation protects your control system from voltage spikes. Consequently, the 1794-IC16 works safely in high-voltage environments. You can also configure the input filter time based on your process needs. For instance, slower processes benefit from longer filter times to ignore noise.

Installation Guidelines

Mount the 1794-IC16 on a standard DIN rail or using screws. First, attach the module to a compatible terminal base unit. For example, suitable bases include the 1794-TB3S or 1794-TB3SK. Then, connect your field devices to the screw terminals. Connect individual inputs to their exact terminal numbers. Use stranded copper wire rated at 75 °C or higher. Recommended wire size ranges from 0.34 to 2.5 mm² (22 to 12 AWG). Tighten terminal screws to 0.8 Nm (7 lb-in). Accordingly, always disconnect power before wiring the 1794-IC16. Finally, ground the DIN rail properly to avoid noise issues. We generally advise using a surge protector for sudden power imbalances.

Important installation notes include the following:

• Use a PELV or SELV power supply for safety.

• Do not exceed 60V DC on any input channel.

• Keep input wiring separate from high-power cables.

• Verify the sinking type matches your field sensors.

• Use appropriate communication media for remote desktop interface.

Packaging List

• 1794-IC16 digital input module (1 unit)

• Removable terminal block (attached to mating base)

• Product identification label

• Installation instructions sheet

Frequently Asked Questions (FAQ)

1. What type of sensors work with the 1794-IC16?
The 1794-IC16 accepts sinking (NPN) type sensors. Specifically, these sensors switch the load to ground or DC common.

2. Can I use the 1794-IC16 with 24V DC sensors?
No, the 1794-IC16 requires a minimum of 30V DC on-state voltage. For 24V DC applications, please use the 1794-IV16 instead.

3. What terminal bases work with this module?
The 1794-IC16 works with 1794-TB3S and 1794-TB3SK terminal bases. These bases support the sinking input configuration.

4. Does this module provide input filtering?
Yes, you can configure the input filter time on the 1794-IC16. Adjust this setting based on your specific process requirements.

5. How do I know which input is active?
Each channel on the 1794-IC16 has a logic-driven status indicator. The LED turns on when the input voltage exceeds 30V DC. Thus, you get clear visual feedback for every channel.