PRODUCT INFORMATION
Product Overview
The Allen-Bradley 1771-IFEK is a conformal-coated PLC-5 analog input module. It mounts into a single slot of an Allen-Bradley 1771 I/O chassis. The unit converts field analog signals into proportional digital values for the PLC processor. A polymeric conformal coating protects internal electronic components against humidity and airborne contaminants. The module transfers input data words and receives configuration words through block transfer programming. Operating power is drawn directly from the backplane without an external power supply.
The module provides selectable input capacity for 8 differential channels or 16 single-ended channels. Data values convert to natural binary or 4-digit BCD formats with scaling to engineering units. Selectable voltage spans include 0 to 5 VDC, 1 to 5 VDC, and bipolar ranges. Selectable current inputs include 4 to 20 mA, 0 to 20 mA, and bipolar ranges. Channel update speed reaches 18 milliseconds for 8 channels or 36 milliseconds for 16 channels. Field terminations wire directly to a separate 1771-WG field wiring arm.
TECHNICAL DATA
Technical Specifications
| Parameter | Specification |
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| Category | PLCs |
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| Weight | 1.00 lbs (0.45 kg) |
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| Module Type | Analog Input |
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| Number of Inputs & Outputs | 8 Differential Selectable or 16 Single-Ended Selectable |
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| Data Format | Natural Binary or BDC Scaling to +/- 9999 |
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| Channel Update/Resolution | 18 ms/8 channels; 36 ms/16 channels; 12 bits + sign |
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| Voltage Range | 0-5 V dc, 1-5 V dc, +/- 5 V dc, +/- 10 V dc |
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| Current Range | 4-20 mA, 0-20 mA, +/- 20 mA |
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| Backplane Current | 750 Miliamperes |
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| External Power Required | No |
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| Wiring Arm | 1771-WG |
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| Coating | Conformal Coat |
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| Typical AC Signal Delay (Off) | 24 (+/- 10) ms |
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| Typical DC Signal Delay (Off) | 20 (+/- 9) ms |
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| Mounting | Rack Mountable |
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TECHNICAL INFORMATION
Features
- Conformal coating shields internal circuitry from humidity and airborne chemical contaminants.
- Configurable hardware supports either 8 differential or 16 single-ended analog inputs.
- Operates with PLC-5 processors using block transfer read and write ladder programming.
- Provides natural binary or 4-digit BCD scaling up to plus or minus 9999.
- Features optoelectrical isolation and digital filtering to suppress electrical interference.
- Includes a green RUN indicator and a red FAULT indicator for visual status diagnostics.
- Operates without an external power supply by drawing power from the chassis backplane.
TECHNICAL INFORMATION
Connections / Interfaces
- Connects mechanically and electrically to a single slot in any 1771 I/O chassis.
- Terminates field wiring through the Allen-Bradley 1771-WG field wiring arm.
- Permits module removal without disconnecting field wiring from the wiring arm.
TECHNICAL INFORMATION
Installation Guidelines
- Place keying bands between chassis backplane pins 10-12 and pins 24-26.
- Turn off chassis backplane power before inserting or removing the module.
- Align the module with the chassis card guides and slide it into the slot.
- Attach the 1771-WG wiring arm securely to the chassis front edge.
TECHNICAL INFORMATION
Configuration Guidelines
- Assign the channel structure for 8 differential or 16 single-ended inputs.
- Select input ranges across five voltage options and three current loop options.
- Configure data format selections for natural binary or 4-digit BCD scaling.
- Implement block transfer read and write instructions in the PLC-5 processor ladder logic.
TECHNICAL INFORMATION
Compatibility
- Installs into standard Allen-Bradley 1771 I/O chassis slots.
- Interfaces with Allen-Bradley 1771-WG field wiring arms.
- Communicates with PLC-5 programmable controllers supporting block transfer communications.
TECHNICAL INFORMATION
Lifecycle / Replacement Information
- Replacing a unit with a 1771-IFEK module maintains required conformal coating specifications.
- The swing-away 1771-WG field wiring arm allows hardware replacement without rewiring field terminations.
TECHNICAL RESOURCES
Documentation
COMPATIBILITY
Compatibility & Replacement
COMPATIBLE MODELSInstalls into standard Allen-Bradley 1771 I/O chassis slots. Interfaces with Allen-Bradley 1771-WG field wiring arms. Communicates with PLC-5 programmable controllers supporting block transfer communications.
Verify compatibility against the exact Part Number, revision and manufacturer documentation before ordering.
PART VERIFICATION
Before You Order
Industrial automation parts can share similar model names, suffixes and revisions. Confirm the complete manufacturer Part Number before purchase.
01Check Part NumberMatch the complete ordering code on the existing unit.
02Confirm RevisionCheck suffix, hardware or firmware when applicable.
03Send a Label PhotoWe can review a clear label photo when identification is uncertain.
ORDERING PROCESS
From RFQ to Dispatch
1Submit Part Number2Verify Product Identity3Confirm Stock & Condition4Issue Quotation5Dispatch & Tracking
PRODUCT FAQ
Frequently Asked Questions
What wiring arm does the 1771-IFEK module require?
The module requires an Allen-Bradley 1771-WG field wiring arm for all field wiring connections.
What protection does the 1771-IFEK conformal coating provide?
The polymeric conformal coating shields circuit components against humidity, moisture, and environmental contaminants.
Does the 1771-IFEK require an external power supply?
No external power supply is needed. The unit draws operating current directly from the 1771 backplane.
What channel configurations does the 1771-IFEK support?
The module supports up to 8 differential inputs or up to 16 single-ended analog inputs.
