Allen-Bradley 1771-ILK Analog Input – 8-Channel PLC 5 Module

1771-ILK Isolated Analog Input Module

1771-ILK – 8 isolated differential inputs (1000V). Natural binary or BDC scaling to ±9999. 15-bit + sign resolution. No external power required. Rack mountable with 1771-WF wiring arm.

Oiltech Controls’s Insight

• Perfect for noisy industrial environments – 1000V isolation protects your PLC backplane.
• Flexible signal conditioning: accepts 0–10V, ±10V, 4–20mA, and more.
• Conformal coating resists moisture and dust – ideal for harsh plants.
• Fast update: 500 ms for all 8 channels – no missed process changes.

Technical Specifications

• Manufacturer: Rockwell Automation / Allen‑Bradley
• Part Number: 1771‑ILK
• Type: Isolated Analog Input (8 channels)
• Isolation: 1000V differential
• Data Format: Natural binary or BDC scaling to ±9999
• Resolution: 15 bits + sign
• Channel Update: 500 ms for 8 channels
• Voltage Ranges: 0–5V, 1–5V, ±5V, 0–10V, ±10V DC
• Current Ranges: 4–20mA, 0–20mA, ±20mA
• Backplane Current: 1.3 A
• External Power: Not required
• Wiring Arm: 1771‑WF
• Coating: Conformal coated
• AC Signal Delay (Off): 24 ms ±10
• DC Signal Delay (Off): 20 ms ±9
• Mounting: Rack mountable

Compatible Equipment

• PLC 5 processors (all series)
• 1771 I/O chassis
• Analog signal sources: transmitters, sensors, transducers
• Process control loops (temperature, pressure, flow)
• Replaces 1771‑IFE, 1771‑IXE in many applications

5 Professional FAQs

Q: What is the effective resolution for a 4–20mA signal?

15 bits + sign gives ~0.003% of span. For 20mA range, step size is about 0.6 µA – excellent for precision.

Q: Can I mix voltage and current inputs on one module?

Yes. Each of the 8 inputs is individually configurable for voltage or current via jumpers. No external resistors needed.

Q: How do I choose between 1771‑ILK and 1771‑IFE?

Choose ILK if you need high isolation (1000V) and conformal coating. IFE is non‑isolated and cheaper – but ILK is safer for harsh/ground‑loop prone sites.

Q: What is the impact of the signal delay?

24 ms AC / 20 ms DC off‑delay is typical. For fast‑changing signals, use the DC range – it responds 4 ms faster.

Q: Does the module support HART or smart transmitters?

No. This is a passive analog input. For HART, use a 1771‑ILK with a HART multiplexer or upgrade to 1756 series.

Why Buy From Oiltech Controls?

• 15+ years sourcing hard‑to‑find PLC parts.
• Global logistics – we ship to over 50 countries.
• Every unit is tested before shipping – no DOA.
• 12‑month warranty on all modules.
• Technical verification – we check your part number against your system.
• Expert support for obsolete systems – we know PLC 5 inside out.

Shipping & Warranty

• Warranty: 12 months against defects.
• Dispatch: 24–28 hours after order.
• Carriers: FedEx, UPS, DHL – tracking provided.
• Express options available at checkout.

Contact: info@oiltechcontrols.com or +86 158 8020 0923 (WhatsApp).

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