Allen-Bradley 1794-IP4 Flex 4 Point Distributed I/O Comb Module

Product Description

The Allen-Bradley 1756-IB16ISOE is a ControlLogix digital input module designed for sequence-of-events (SOE) applications. It provides 16 individually isolated DC inputs, enabling precise event capture with high-speed response. The module supports both sink and source configurations, making it versatile for industrial monitoring and control systems.

Technical Specifications

Product Description

The Allen-Bradley 1794-IP4 is a Flex I/O pulse counter module with four input channels, designed for distributed control applications. It provides high-speed counting capability with a maximum input frequency of 100 kHz, making it suitable for precise monitoring of pulse signals in industrial automation systems.

Technical Specifications

• Manufacturer: Allen-Bradley

• Product Line: Flex I/O 1794

• Part Number: 1794-IP4

• Weight: 0.25 lbs (0.11 kg)

• Inputs: 4 channels, grouped into 2 input groups

• Minimum Pulse Width: 2 µs

• Input Frequency: Up to 100 kHz

• Terminal Base Compatibility: 1794-TB2, -TB3, -TB3S, -TBN, -TBKD

• ON-State Voltage Range: 6–26.4 V DC (nominal 24 V DC)

• OFF-State Voltage Range: -26.4 to 3 V DC max

• Input Current: 3 mA @ 6 V DC

• Flexbus Current: 5 mA @ 5 V DC

• Isolation Voltage: 500 V DC

• Power Dissipation: 5 W max @ 26.4 V DC

• Thermal Dissipation: 17.1 BTU/hr max @ 26.4 V DC

• Enclosure Type: Open-style, DIN rail mounting

• Operating Temperature: 0–55 °C (32–131 °F)

• Storage Temperature: -40–85 °C (-40–185 °F)

• Vibration Resistance: 5 g @ 10–500 Hz

• Shock Resistance: 30 g

Features

• Four-channel pulse counter for distributed I/O systems

• High-speed input capability up to 100 kHz

• Compact Flex I/O design for modular installation

• DIN rail mounting for easy integration

• Isolated inputs for improved signal reliability

Application Scenarios

• Machine Monitoring: High-speed pulse counting for rotary encoders and sensors

• Process Automation: Accurate input measurement for distributed control systems

• Legacy Flex I/O Installations: Expansion module for existing Flex I/O networks

FAQ

• Q: How many input channels does the 1794-IP4 provide?  A: Four input channels, grouped into two sets.

• Q: What is the maximum input frequency?  A: 100 kHz.

• Q: Which terminal bases are supported?  A: 1794-TB2, -TB3, -TB3S, -TBN, and -TBKD.

• Q: What isolation voltage is provided?  A: 500 V DC.

• Q: How does this compare to the 1794-IP2?  A: The 1794-IP4 supports four channels, while the 1794-IP2 provides two, making the IP4 suitable for higher-density applications.

Manufacturer: Allen-Bradley

• Product Line: ControlLogix

• Part Number: 1756-IB16ISOE

• Category: PLCs

• Weight: 0.44 lbs (0.20 kg)

• Module Type: Digital DC Isolated Input (SOE)

• Inputs: 16 isolated channels

• Input Voltage Range: 24–48 V DC (sink/source)

• Operating Voltage Range: 10–55 V DC

• Input Delay Time: 50 µs + selectable filter time

• Minimum Operating Current: 5.5 mA at 55 V DC

• Maximum Operating Current: 2 mA at 10 V DC

• Off-State Current (Max): 1.5 mA

• Power Dissipation: 5.5 W at 60 °C

• Backplane Current Draw:

• 275 mA @ 5 V DC

• 2 mA @ 24 V DC

• Terminal Blocks: 1756-TBCH, 1756-TBS6H (removable)

• Isolation Voltage: 75 V continuous; type-tested at 1200 V AC for 2 s

Features

• High-speed event capture with 50 µs response

• Individually isolated inputs for improved reliability

• Supports both sink and source wiring configurations

• Designed for sequence-of-events monitoring in critical applications

• Compatible with removable terminal blocks for simplified wiring

Application Scenarios

• Power System Monitoring: Event capture for fault detection and logging

• Industrial Automation: Precise input tracking for safety and control systems

• Critical Infrastructure: Sequence-of-events recording in energy and utility networks

FAQ

• Q: How many inputs does the 1756-IB16ISOE provide?  A: Sixteen individually isolated DC inputs.

• Q: What is the input delay time?  A: 50 microseconds plus selectable filter time.

• Q: Which terminal blocks are compatible?  A: 1756-TBCH and 1756-TBS6H.

• Q: What isolation voltage is supported?  A: 75 V continuous, tested at 1200 V AC for 2 seconds.

• Q: How does this compare to the 1756-IB16?  A: The 1756-IB16ISOE provides isolated inputs and SOE functionality, while the 1756-IB16 is a standard DC input module without event sequencing.