ALLEN BRADLEY 1798-IB4 Plc Modules

( Brand: Allen Bradley ), ( Manufacturer Part Number: 1798-IB4 ), ( Part Type: Module )

Review ALLEN BRADLEY 1798ib4 Used

The **Allen-Bradley 1798-IB4** is a high-performance, compact industrial Ethernet switch designed for demanding automation and control applications within the Rockwell Automation ecosystem. Part of the **1798 Series**, this managed Ethernet switch delivers robust networking capabilities tailored for factory floors, process industries, and distributed control systems where reliability, security, and scalability are critical. Built with a **4-port 10/100 Mbps Fast Ethernet** configuration, the 1798-IB4 provides a balance of simplicity and performance, making it ideal for connecting PLCs, HMIs, sensors, and other field devices in a deterministic network environment. Its **industrial-grade construction** ensures operation in harsh environments, withstanding temperature fluctuations ranging from **-40 C to 75 C** and resisting shock and vibration, thanks to its **NEMA 4X-rated enclosure**. The switch supports **full-duplex communication**, minimizing latency and maximizing data throughput for time-sensitive applications such as motion control, robotics, and real-time monitoring.

One of the standout features of the 1798-IB4 is its **integrated security and redundancy capabilities**, including **802.1X authentication**, **port security**, and **VLAN support**, which help safeguard network traffic against unauthorized access and cyber threats. This switch also adheres to **IEEE 802.3af Power over Ethernet (PoE) standards**, enabling power delivery to compatible devices such as IP cameras, wireless access points, or PoE-enabled sensors, simplifying wiring and reducing installation complexity. With **auto-negotiation and auto-MDI/MDIX**, the 1798-IB4 ensures seamless compatibility with a variety of Ethernet devices without requiring manual configuration, enhancing ease of deployment in dynamic industrial settings. Additionally, its **compact, DIN-rail-mountable design** allows for flexible installation in control panels, junction boxes, or directly on machinery, conserving valuable space in tight environments.

For advanced users, the 1798-IB4 offers **SNMP v1/v2c/v3 management**, enabling centralized monitoring and configuration through industry-standard protocols, while its **web-based interface** provides a user-friendly platform for configuring IP addresses, VLANs, and network policies. The switch also supports **Rockwell Automation s DeviceNet and ControlNet protocols** when paired with compatible gateways, facilitating seamless integration into larger automation networks. With **low power consumption** and **fanless operation** (in some configurations), the 1798-IB4 minimizes operational overhead while maintaining reliability in continuous operation. Whether deployed in a discrete manufacturing plant, a chemical processing facility, or a water/wastewater treatment system, this switch delivers a dependable, high-speed Ethernet solution that bridges the gap between IT and OT infrastructure, ensuring efficient data transmission and system resilience.

The **Allen-Bradley 1798-IB4** is a compact, 4-input, 24V DC isolated terminal block module designed for use in **CompactLogix** and **ControlLogix** PLC systems. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros of the 1798-IB4**

1. **Compatibility with Allen-Bradley PLCs**

- Designed specifically for **CompactLogix (5069, 5370, 5560 series)** and **ControlLogix (1756 series)** systems, ensuring seamless integration without additional hardware modifications.

- Supports **EtherNet/IP** and **DeviceNet** communication protocols, making it versatile for modern automation setups.

2. **Isolated Inputs for Safety and Reliability**

- Each input is **optically isolated**, protecting the PLC from voltage spikes, ground loops, and electrical noise.

- Reduces the risk of damage to the PLC from external electrical interference.

3. **Compact and Space-Efficient Design**

- Fits into the **1798 terminal block chassis**, saving space in control panels compared to traditional discrete I/O modules.

- Modular design allows for easy expansion or reconfiguration of I/O without replacing the entire system.

4. **Low Power Consumption**

- Operates at **24V DC**, which is a standard voltage for many industrial sensors and switches.

- Minimal power draw reduces heat generation and extends the lifespan of the PLC and power supply.

5. **Easy Installation and Wiring**

- Terminal block design allows for **quick and secure wiring** with screw terminals (no soldering required).

- Color-coded terminals (e.g., red for power, black for common) simplify troubleshooting and installation.

6. **Wide Input Voltage Range**

- Tolerates input voltages from **10V to 30V DC**, providing flexibility in selecting compatible sensors and switches.

- Helps accommodate slight voltage variations in industrial environments.

7. **Low Cost Compared to Traditional I/O**

- Significantly cheaper than standalone discrete I/O modules (e.g., 1769-I/O modules) when used in CompactLogix systems.

- Reduces overall system costs while maintaining functionality.

8. **Support for High-Speed Inputs (Optional)**

- Can be configured for **high-speed counting** (up to 10 kHz) when paired with certain CompactLogix models, useful for applications like motor feedback or process monitoring.

9. **Rugged and Reliable Build**

- Designed for **industrial environments**, with protection against vibration, dust, and temperature fluctuations (operating range: **-20 C to 60 C**).

- Long lifespan with minimal maintenance requirements.

10. **Backward and Forward Compatibility**

- Works with **older CompactLogix models** and is supported in **Studio 5000 Logix Designer**, ensuring long-term availability of firmware and documentation.

---

### **Cons of the 1798-IB4**

1. **Limited to 4 Inputs**

- Only provides **4 discrete inputs**, which may be insufficient for applications requiring more I/O points.

- Requires additional modules (e.g., 1798-IA4 for analog inputs or more 1798-IB4 modules) to expand functionality.

2. **No Built-in Diagnostics for Inputs**

- Unlike some higher-end I/O modules, the 1798-IB4 does **not** provide detailed diagnostic feedback (e.g., open-circuit detection for each input).

- Troubleshooting may require external tools or manual inspection of wiring.

3. **24V DC Only**

- Not compatible with **12V DC or AC inputs**, limiting its use with certain legacy or specialized sensors.

- Requires voltage conversion if interfacing with non-24V devices.

4. **No Built-in Isolation for Outputs (If Needed)**

- While inputs are isolated, the module does not include isolated outputs. If isolation is required for outputs, a separate module (e.g., 1798-OB4) is needed.

5. **Dependence on PLC Firmware**

- Performance and features (e.g., high-speed counting) are **firmware-dependent**, meaning newer features may require updates.

- Older PLC models may lack support for advanced configurations.

6. **No Built-in Filtering for Noise**

- Unlike some high-end modules, it lacks **internal noise filtering** for very noisy environments (e.g., high-frequency electrical interference).

- May require external filtering (e.g., RC snubbers) for sensitive applications.

7. **Limited Availability of Spare Parts**

- As an older module (introduced in the 2000s), **long-term availability of replacements** may be a concern, especially if Rockwell discontinues support.

- May require sourcing from third-party suppliers or used markets.

8. **No Built-in Bus Power for Some Models**

- Some CompactLogix models (e.g., 5069-L series) may **not** provide bus power to terminal block modules, requiring an external power supply (e.g., 1789-PA or 1789-PB).

- Adds complexity and cost if power must be supplied separately.

9. **No Support for Advanced Protocols (Beyond EtherNet/IP/DeviceNet)**

- Lacks support for **PROFINET, Modbus, or other high-speed industrial protocols**, limiting integration with non-Rockwell systems.

10. **Learning Curve for Configuration**

- Configuring inputs (e.g., setting scan rates, high-speed counting) requires familiarity with **Studio 5000 Logix Designer**, which may be unfamiliar to operators without PLC experience.

---

### **Conclusion**

The **Allen-Bradley 1798-IB4** is a **cost-effective, reliable, and space-efficient** solution for applications requiring **4 isolated 24V DC inputs** in CompactLogix or ControlLogix systems. Its **isolation, compatibility, and simplicity** make it ideal for basic discrete I/O needs in industrial automation, particularly where space and budget are constraints. However, its **limited input count, lack of advanced diagnostics, and dependence on PLC firmware** may pose challenges for more complex or high-reliability applications.

For users with **simple I/O requirements, existing Rockwell infrastructure, and a need for cost savings**, this module is a strong choice. Conversely, those requiring **more inputs, advanced diagnostics, or non-24V compatibility** may need to supplement it with additional modules or consider alternative solutions (e.g., standalone 1769-I/O modules or third-party I/O cards).

---

### **Recommendation**

- You are working with a **CompactLogix or ControlLogix PLC** and need **4 isolated 24V DC inputs**.

- Your application is **low to medium complexity** with minimal I/O requirements.

- You prioritize **cost efficiency, space savings, and ease of installation**.

- You have **existing Rockwell infrastructure** and can leverage EtherNet/IP/DeviceNet.

- You need **more than 4 inputs** (consider adding more 1798-IB4 modules or a 1798-IA4 for analog inputs).

- Your sensors operate at **non-24V voltages** (e.g., 12V DC or AC), requiring voltage conversion.

- You require **advanced diagnostics, high-speed outputs, or noise filtering** (evaluate 1769-I/O modules or third-party options).

- Long-term availability is a concern (check with Rockwell or authorized distributors for stock levels).

- A **1789-PA or 1789-PB power supply** if bus power is insufficient.

- **External filtering components** if operating in highly noisy environments.

- **Studio 5000 Logix Designer** for proper configuration and troubleshooting.

For most **basic to moderately complex industrial applications**, the 1798-IB4 remains a **practical and well-supported choice** within the Rockwell ecosystem. However, always verify compatibility with your specific PLC model and application requirements before purchasing.

Details:

Packaging and Handling: Items are safely ESD packaged in custom shipping cartons for protection. Sells new and surplus product develops channels to purchase such. All products are guaranteed to be working but may show signs of use if purchasing a used product. ALLEN BRADLEY 1798-IB4 / 1798IB4 USED DISCONTINUED BY MANUFACTURER 09/30/2010, INPUT MODULE, FLEX ARMOR I/O, 4 POINT, 24 VDC, SINKING MODULE.

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part #: 1798ib4 prices

• $45.00-$130.00

specifications sensoindustria:

• brand: Allen Bradley
• mpn: 1798-ib4
• part type: Module

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• # reviews: 192461
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offer sensoindustria:

• availability: In Stock
• quantity: 1
• options: Ship-to-home
• sold: 0
• started: March 2, 2026

general sensoindustria:

• PLCs HMIs > PLC Peripheral Modules > PLC Input Output Modules
• condition: Used

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