The Allen-Bradley 1794-IF8IH is a high-performance analog input module from the Flex I/O family. Specifically, it offers eight isolated, single-ended input channels. This module supports HART (Highway Addressable Remote Transducer) communication protocol. Therefore, it enables digital communication with smart field instruments. The 1794-IF8IH uses the Sigma-Delta conversion method. As a result, it delivers high accuracy and excellent noise rejection. This module is an ideal choice for complex process automation systems requiring reliable analog signal acquisition.
The 1794-IF8IH features eight isolated analog inputs. Each input is single-ended and non-isolated from each other. However, the module provides isolation between the field side and the system side. It supports a wide range of analog signals. For instance, it handles both voltage and current inputs. The module is factory calibrated. Moreover, it also supports field calibration if required for specific applications.
Resolution is a key strength of this module. Specifically, it offers 16-bit resolution for unipolar configurations. Furthermore, it provides 15-bit plus sign resolution for configurations handling both positive and negative signal ranges. The Sigma-Delta conversion method ensures stable and precise measurements even in noisy environments.
The 1794-IF8IH requires an external DC supply. The nominal voltage is 24V DC, with a range of 19.2 to 31.2V DC (including 5% AC ripple). The FlexBus current draw is 80 mA at 5V DC. At the maximum rated voltage of 31.2V DC, the module dissipates 4.8 Watts of power. Meanwhile, its thermal dissipation is 16.4 BTU/hr. This efficient design minimizes heat generation in the control cabinet.
A standout feature of the 1794-IF8IH is its HART communication capability. HART is an open protocol that enables bidirectional digital communication. Through the 1794-IF8IH, you can access additional process variables from smart transmitters. Moreover, you can perform diagnostics and reconfigure connected HART devices. This integration reduces the need for separate HART multiplexers. Furthermore, it simplifies wiring and lowers overall system costs. The 1794-IF8IH is fully compatible with HART-enabled field instruments.
The 1794-IF8IH excels in applications with signal interference. Specifically, it provides isolation between the field side and the system side. This isolation effectively blocks ground potential differences that can occur in control loops. Furthermore, it rejects unwanted interference signals picked up by long sensor cables. As a result, the module ensures accurate and reliable analog signal processing even in electrically noisy industrial environments.
The 1794-IF8IH is built for reliable operation in industrial settings. First, its operating temperature range is 32 °F to 131 °F (0 °C to 55 °C). Second, it has an open-style enclosure. The module's compact dimensions are 3.7 x 3.7 x 2.6 inches. This small footprint saves valuable panel space.
The module is approved for safe operation in hazardous locations. Specifically, it meets North American Hazardous Location Approval standards. Therefore, it is suitable for use in potentially explosive atmospheres.
The 1794-IF8IH requires a compatible terminal base for installation. Specifically, it works with the following terminal base units:
1794-TB3
1794-TB3S
Select the appropriate base based on your wiring needs. The terminal base determines the wire size and connection method. For signal ports, use shielded wire and follow wiring category 2 guidelines. For power ports, follow wiring category 3 guidelines. Always use shielded cables to maintain signal integrity.
Installing the 1794-IF8IH is a straightforward process. First, mount the compatible terminal base (1794-TB3 or 1794-TB3S) onto a DIN rail. Next, snap the 1794-IF8IH module firmly onto the terminal base. Ensure it clicks securely into place.
Connect your analog field devices to the terminal base according to the wiring diagram. Pay attention to the single-ended wiring configuration. Connect the external DC power supply to the designated terminals. Finally, connect the communication adapter to complete the Flex I/O assembly.
Always power down the system before installation. Moreover, verify all connections are secure before applying power. After power-up, check the status indicators to confirm normal operation. For HART communication, ensure proper termination and wiring practices.
The 1794-IF8IH offers user-configurable settings. For example, these include:
Input range selection for each channel
Data format selection (including unipolar and dual-polarity signal formats)
HART communication settings
Digital filtering options
Fault mode behavior
Configuration is performed through the communication adapter. No physical switches or jumpers are required. Therefore, this software-based approach simplifies setup and allows for easy adjustments.
Your shipment for the Allen-Bradley 1794-IF8IH includes:
(1) Allen-Bradley 1794-IF8IH Flex I/O HART Analog Input Module
(1) Installation Instructions manual
The module is packaged in an anti-static bag for safe transport.
All orders are shipped via premium courier services. Your 1794-IF8IH will be dispatched using FedEx, UPS, or DHL. Moreover, you will receive tracking information once your order ships.
1. How many analog inputs does the 1794-IF8IH provide?
The 1794-IF8IH provides eight isolated, single-ended analog inputs. Each channel can be configured for voltage or current operation.
2. What is the advantage of HART support on this module?
HART support allows the 1794-IF8IH to communicate digitally with smart transmitters. For instance, you can access secondary variables, run diagnostics, and reconfigure devices. Therefore, this eliminates the need for separate HART interface hardware.
3. Which terminal bases are compatible with the 1794-IF8IH?
The 1794-IF8IH is compatible with terminal bases 1794-TB3 and 1794-TB3S. Consequently, choose the base that best fits your wiring and installation preferences.
4. What is the resolution of the 1794-IF8IH analog inputs?
The 1794-IF8IH provides 16-bit resolution for unipolar configurations. For configurations handling both positive and negative signal ranges, it provides 15-bit plus sign resolution. Thus, it delivers high precision for demanding process control applications.
5. What is the operating temperature range of the 1794-IF8IH?
The 1794-IF8IH operates safely within a temperature range of 32 °F to 131 °F (0 °C to 55 °C). This makes it suitable for standard industrial environments.
| Brand Name | |
| Model No. | 1794-IF8IH |
| Product Type | Analog Input Module |
| hasMerchantReturnPolicy | Adjust according to reality |
| Shippingdetails | Adjust according to reality |
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