Feimu Technology offers the Allen Bradley 1794-IF8IH. This product is specifically designed to convert the continuous changing signals from industrial sites - such as temperature, pressure or flow - into digital language that the controller can understand. It is different from ordinary current-type modules. It is specially responsible for handling isolated signals and has extremely strong anti-interference ability. We always keep this product in stock here to complete the most crucial piece of the puzzle for your Flex I/O system, so that you don't have to seek help from everyone for this single module.
This Allen Bradley 1794-IF8IH model supports the HART communication protocol, which means it not only can read the 4-20mA current value, but also can "talk" with the on-site intelligent instruments to obtain more diagnostic information inside the instruments. Its conversion accuracy is particularly high, capable of capturing even the slightest changes in the field. And in the factory that kind of electromagnetic environment is particularly messy, its isolation performance plays a big role, can effectively prevent the outside interference signal to mess up the data, to ensure that the data transmitted to PLC is true and reliable.
This Allen Bradley 1794-IF8IH has a very unique feature, which is its "channel-to-channel isolation". Many ordinary modules have common grounds for several channels, so if one ground wire is wrongly connected or there is a strong interference, all the channels may be affected. But this one is different. Each channel is independently isolated. Even if one channel fails, it won't affect the others. It is particularly suitable for those sites with complex signal sources and poor grounding conditions. Another feature is that it is very energy-efficient and generates very little heat. Even if it is installed in a sealed cabinet, there is no need to worry about poor heat dissipation and overheating of the surrounding area.
Allen Bradley 1794-IF8IH is certified with UL/cULus labels, which actually complies with the safety standards of the United States and Canada. It has passed the CE certification and holds ATEX and IECEx certifications. The design and manufacturing meet strict standards, allowing for safe use in hazardous locations where there is potential for explosive gases. It is used in the oil, gas, and chemical industries.
Feimu Technology has been operating in this industry for many years, and its success is attributed to its understanding of the value of these specialized products. We are not the kind of company that merely sells general digital modules. We also have a substantial inventory of these special analog modules. Many customers have to switch to this isolation module due to high interference in the field, but it is difficult to find such modules on the market. We usually have them in stock here. What we aim to do is to ensure that when you are dealing with difficult problems in the field, you won't be hindered by the hardware.
The Allen Bradley 1794-IF8IH is an 8-channel isolated analog input module for the Flex I/O system. It supports 4-20mA current inputs with HART protocol communication.
| Parameter | Specification |
|---|---|
| Product Model | Allen Bradley 1794-IF8IH |
| Product Series | Flex I/O |
| Number of Inputs | 8 channels |
| Input Type | 4-20mA current (with HART protocol) |
| HART Protocol Support | Yes (Host mode) |
| Resolution | 16 bits |
| Accuracy | ±0.1% of full range at 25°C |
| Input Impedance | 250Ω |
| Channel Isolation | Isolation between channels and to ground |
| Update Rate | Configurable (fast or normal) |
| Backplane Current Draw | 150mA at 5V DC |
| Power Dissipation | 2.5W maximum |
| Operating Temperature | -20°C to 55°C |
| Storage Temperature | -40°C to 85°C |
| Relative Humidity | 5% to 95% (non-condensing) |
| Certifications | UL, cUL, CE, ATEX, IECEx |
The 1794-IF8IH supports HART communication. HART (Highway Addressable Remote Transducer) is a hybrid protocol that allows digital communication over traditional 4-20mA analog wiring.
What HART does:
HART data available:
Field benefit: A customer had a pressure transmitter that was reading incorrectly. Using HART, they read the diagnostics and found the sensor was saturated. The transmitter was checked and recalibrated. Without HART, they would have assumed the module was faulty and replaced it unnecessarily.
The 1794-IF8IH provides isolation between every channel and between channels and the ground. This is a significant advantage over non-isolated modules.
| Condition | Without Isolation | With Isolation (1794-IF8IH) |
|---|---|---|
| Ground loop | Affects all channels. Causes fluctuating readings. | Isolation breaks the ground loop. Readings stay stable. |
| High common-mode voltage | Damages the module or causes incorrect readings. | Module handles up to ±400V common mode voltage. |
| Wiring error on one channel | May damage other channels sharing the same ground. | Isolation protects other channels. |
| Lightning or surge on signal cable | Damage spreads to other channels and backplane. | Isolation limits the damage to the affected channel. |
Field issue example: A customer installed 1794-IF8IH modules in a water treatment plant. The plant had long sensor cables running near VFD cables. Without isolation, the readings fluctuated. With the 1794-IF8IH, the readings remained stable. Isolation solved the ground loop problem.
The 1794-IF8IH supports both 2-wire and 4-wire transmitters with HART communication.
2-wire transmitters (loop-powered):
4-wire transmitters (externally powered):
Wiring rules for HART:
The 1794-IF8IH has LED indicators on the front panel. These provide immediate status information.
| LED | Status | Meaning | Action |
|---|---|---|---|
| PWR | Green | Module powered and operating normally. | No action needed. |
| PWR | Off | No power to module. | Check Flex I/O power. Check backplane connection. |
| CH0 - CH7 | Green | Channel configured and reading normal. | No action needed. |
| CH0 - CH7 | Off | Channel not configured or not used. | Configure channel in Studio 5000. |
| CH0 - CH7 | Red | Input signal out of range or HART communication error. | Check sensor wiring. Check HART configuration. |
Allen Bradley 1794-IF8IH modules are commonly counterfeited. Use these checks to verify authenticity.
If the module shows incorrect readings or the HART communication fails, suspect a counterfeit. Contact Feimu Technology with photos for verification.
Feimu Technology does not ship untested modules. Each 1794-IF8IH goes through the following verification process before leaving our warehouse.
Test reports are available upon request. Email sales@feimutech.com for a copy of your module's test report.
Address
No. 26, Yuhu Street, Encheng Subdistrict, Enping City, Jiangmen City, Guangdong Province, China
Tel
