Allen-Bradley 1756-IF8/A Analog Input Module
$123.00
$320.00
Description
Allen-Bradley 1756-IF8/A Analog Input Module
Configured for acquisition of voltage and current signals within ControlLogix I/O chassis systems, the Allen-Bradley 1756-IF8/A, also cataloged as the 1756-IF8 analog input module, provides direct electrical conversion of 8-channel analog inputs including differential, single-ended, and 2-wire transmitter signals for backplane-based data processing.
Suffix Breakdown & Model Matrix
No structured suffix segmentation is defined beyond base catalog identifier 1756-IF8/A.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1756-IF8/A |
| Brand | Allen-Bradley |
| Origin | USA |
| Weight | 0.2 kg |
| Dimensions | 2.0 in x 6.0 in x 5.0 in |
| Operating Temp | 0 to 60 deg C |
| Power Consumption | ~120 mA at 5.1 VDC |
| Number of Inputs | 8 analog channels |
| Signal Types | Voltage: ±10 V, 0–10 V, 0–5 V, 1–5 V; Current: 0–20 mA, 4–20 mA |
| Resolution | 15 bits plus sign |
| Accuracy | ±0.1% full scale |
| Input Impedance | Voltage >1 MΩ, Current 250 Ω |
| Update Rate | Configurable (high-speed mode limited to 4 channels) |
| Isolation | Channel-to-backplane isolation |
| Connector Options | 36-pin RTB / 1492 IFM |
ControlLogix Backplane Acquisition and Channel Scaling Behavior
The module interfaces with the ControlLogix backplane through deterministic scheduled data exchange cycles. Analog-to-digital conversion is executed per channel with configurable scan segmentation, where high-speed mode restricts active channel count to maintain conversion throughput. Channel scaling is performed internally using fixed resolution ADC mapping (15-bit signed representation), with backplane current draw defining slot-level power budgeting constraints in the chassis.
Frequently Asked Questions (FAQ)
Q: Can all 8 channels operate simultaneously in high-speed mode?
A: No. In high-speed mode, only 4 channels are active due to conversion timing constraints.
Q: Does the module support hot-swap removal during operation?
A: Removal is supported only under chassis-approved conditions; backplane power must be managed to avoid bus interruption during insertion or extraction.
Q: Can voltage and current inputs be mixed on different channels?
A: Yes. Each channel is individually configurable for voltage or current input types.
Field Installation Guidelines
The module shall be installed in a ControlLogix chassis with system power removed prior to insertion of the RTB or IFM interface. Shielded analog wiring is required for both voltage and current loops, with shield termination performed at a single grounding point within the control cabinet. Channel configuration must be completed before energizing the backplane to ensure correct scaling and input mode initialization. Wiring separation between analog signals and high-frequency switching conductors must be maintained to reduce induced noise coupling.
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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