Allen-Bradley 1794-OE8H/B FLEX I/O Analog Output Module
$123.00
$320.00
Description
Allen-Bradley 1794-OE8H/B FLEX I/O Analog Output Module
Configured for HART-enabled analog current output execution in FLEX I/O systems, the Allen-Bradley 1794-OE8H/B (1794-OE8H Analog Output Module) provides direct physical/electrical execution for 4-20 mA signal generation and HART communication pass-through functions.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1794-OE8H/B (Series B) |
| Brand | Allen-Bradley |
| Product Type | HART Analog Output Module |
| Series | FLEX I/O |
| Origin | USA |
| Operating Temp | 0 deg C to +55 deg C |
| Power Consumption | 6.1 W maximum at 31.2 V DC |
| Number of Outputs | 8 single-ended analog output channels |
| Output Signal Range | 4-20 mA |
| HART Support | Dedicated HART modem per channel with communication pass-through |
| Resolution | 13 bits (12.5 bits for 4-20 mA) |
| FlexBus Current | 80 mA at 5 V DC |
| External Power Supply | 24 V DC nominal (19.2 to 31.2 V DC including 5% AC ripple) |
| External Power Current | 190 mA at 24 V DC |
| Update Time | <= 10 ms for all channels updated to FLEX Bus |
| Step Response | 18 ms to 99% of full scale |
| Isolation | Channel-to-backplane optical isolation, tested at 850 V AC for 1 s |
| Compatible Terminal Bases | 1794-TB3G, 1794-TB3GS |
| Status Indicators | Power LED, fault LEDs, HART communication LEDs |
| Conformal Coating | Standard |
HART Communication and Analog Output Characteristics
The 1794-OE8H/B provides eight current output channels with integrated HART communication capability. Each channel includes a dedicated HART modem path, allowing simultaneous transmission of 4-20 mA analog signals and digital HART data to compatible field devices.
The module operates within the FLEX I/O architecture through FlexBus communication and supports optical isolation between field channels and the backplane interface. The isolated design separates field wiring conditions from controller-side communication circuits.
The module supports deterministic EtherNet/IP, ControlNet, and other FLEX I/O network architectures through compatible adapter interfaces. Firmware flash compatibility shall be verified before replacement or system upgrades.
Frequently Asked Questions
Q: Does the 1794-OE8H/B support direct HART communication on each output channel?
A: Yes. Each of the eight analog output channels contains a dedicated HART modem for digital communication pass-through while maintaining 4-20 mA output operation.
Q: Is the module hot-swappable during system operation?
A: Installation or removal procedures shall follow the FLEX I/O system power and terminal base handling requirements. Hot-swap capability depends on the installed system configuration and controller architecture.
Q: What isolation method is used between field signals and the backplane?
A: The module uses channel-to-backplane optical isolation to separate field-side analog circuits from FLEX Bus communication circuits.
Field Installation Guidelines
- Install the module on compatible FLEX I/O terminal bases such as 1794-TB3G or 1794-TB3GS before field wiring connection.
- Verify 24 V DC field power polarity and supply quality before energizing the module.
- Route analog signal wiring separately from high-voltage switching conductors to reduce electrical interference.
- Apply appropriate cable shielding and connect shields according to the plant grounding standard.
- Maintain separation between HART-enabled signal wiring and high-noise power cables.
- Confirm controller adapter compatibility and firmware requirements before commissioning replacement modules.
- Check LED status indicators after installation to verify power, fault, and HART communication conditions.
Features
Minimum Order Quantity (MOQ)
We welcome bulk orders and have a minimum order quantity of just one unit.
Certificates and Documentation
Upon request, we can provide all necessary documentation, including Certificates of Origin/Conformance and other required export documents.
Delivery Time
For items in stock, we aim to deliver within 1-3 days after payment confirmation. Items with specified lead times will be delivered according to the quoted schedule.
Payment Methods
We accept 100% T/T (Telegraphic Transfer) payment before shipping. For items with lead times, a 30% deposit is required upfront, with the remaining 70% due before shipment. For RMB transfers, please contact us if you have an agent in China.
Warranty
We offer a standard one-year warranty on all new and original items. If you require an extended warranty, please contact us for additional cost details.
Refund and Return Policy
Your satisfaction is important to us. If you need to return an item, it must be done within 30 days of the order date. The product must be unused, unopened, and in its original packaging with all accessories included. Refunds are processed within 5-7 business days after we receive the returned item. Please note that shipping and related charges are non-refundable.
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