High-Speed TTL Signal Solution – Allen-Bradley 1756-IG16 | ControlLogix Series
The Allen-Bradley 1756-IG16 is a 16-point TTL (Transistor-Transistor Logic) digital input module designed for the Rockwell Automation ControlLogix platform. It captures high-speed 5 VDC TTL-level signals from encoders, proximity sensors, and pulse-generating devices — making it the preferred choice for precision motion, counting, and synchronization applications in demanding industrial environments.
Where This Product Is Used
The 1756-IG16 is specified across a wide range of high-speed and precision-critical industries:
- Semiconductor & Electronics Manufacturing — Interfaces with TTL-output encoders on wafer-handling robots and pick-and-place machines requiring sub-millisecond response.
- Packaging & Printing Lines — Captures pulse signals from registration marks, web tension sensors, and rotary encoders for precise cut-to-length and print registration control.
- Automotive Assembly — Reads TTL feedback from servo drives and linear encoders on body-in-white welding fixtures and torque-controlled fastening stations.
- Material Handling & Conveyor Systems — Counts pulses from incremental encoders on conveyor drives for accurate position tracking and zone control.
- Food & Beverage Processing — Interfaces with high-speed flow meters and optical sensors on filling and capping lines where 24 VDC I/O is incompatible with TTL-level devices.
- Test & Measurement Systems — Integrates with laboratory instruments and test benches that output standard 5 V TTL logic signals.
Technical Specifications
- Module Type: Digital Input, TTL (5 VDC)
- Number of Inputs: 16 points
- Input Voltage Range: 0–5.25 VDC
- Logic 0 (OFF State): 0–0.8 VDC
- Logic 1 (ON State): 2.0–5.25 VDC
- Input Impedance: 2.65 kΩ (typical)
- Input Current (Logic 1): 1.9 mA (typical at 5 VDC)
- Module Backplane Current: 250 mA @ 5 VDC (from ControlLogix backplane)
- Isolation: None (non-isolated; common reference)
- RPI (Requested Packet Interval): 0.2 ms minimum
- Wiring: Removable terminal block (RTB), 20-pin
- Compatibility: All ControlLogix 1756 chassis and power supplies
- Operating Temperature: 0–60 °C (32–140 °F)
- Relative Humidity: 5–95% non-condensing
- Dimensions (H × W × D): 94.0 × 94.5 × 58.5 mm (3.70 × 3.72 × 2.30 in)
- Weight: 200 g (approx.)
- Catalog Number: 1756-IG16
- Series: ControlLogix 1756
Why Engineers Specify This Model
- Native TTL Compatibility — Eliminates the need for external signal converters or level-shifters when interfacing with 5 V logic devices, reducing BOM cost and panel complexity.
- Fast RPI (0.2 ms minimum) — Supports high-frequency pulse capture and tight scan-cycle synchronization critical for motion and counting applications.
- ControlLogix Ecosystem Integration — Fully supported in Studio 5000 Logix Designer with Add-On Instructions (AOIs) and pre-built function blocks for encoder and counter logic.
- Removable Terminal Block (RTB) — Enables module replacement without rewiring, minimizing downtime during maintenance or module swap.
- Proven Field Reliability — Part of the ControlLogix platform with decades of deployment in mission-critical manufacturing environments worldwide.
Complete System Bill of Materials
A typical ControlLogix TTL input system using the 1756-IG16 includes:
- 1756-IG16 — 16-point TTL input module (this item)
- 1756-TBNH or 1756-TBNF — 20-pin removable terminal block (RTB), sold separately
- 1756-A7 / 1756-A13 / 1756-A17 — ControlLogix chassis (7, 13, or 17 slots)
- 1756-PA72 / 1756-PB72 — ControlLogix power supply (120/240 VAC or 18–32 VDC)
- 1756-L8x series — ControlLogix L8x controller (e.g., 1756-L83E, 1756-L85E)
- 1756-EN2T / 1756-EN3TR — EtherNet/IP communication module
- Shielded twisted-pair cable — Recommended for TTL signal wiring to minimize noise
Compliance & Industry Standards
- UL Listed (UL 508)
- CE Marked — Compliant with EU Low Voltage Directive and EMC Directive
- RoHS Compliant
- ATEX / IECEx: Not rated for hazardous locations (standard version)
- IEC 61131-2: Programmable controllers — Equipment requirements and tests
Quality Assurance & Sourcing
Konmask.com sources the 1756-IG16 through verified industrial automation distributors and authorized supply channels. Every unit undergoes:
- Visual and mechanical inspection upon receipt
- Firmware version and label verification against Rockwell Automation documentation
- Functional power-on check prior to shipment
- Anti-static packaging with humidity indicator cards for long-term storage integrity
We supply both new factory-sealed and tested surplus units. Condition is clearly stated on each listing. Certificates of conformance (CoC) and test reports are available upon request.
How to Source This Part
- Request a Quote: Contact support@konmask.com with your required quantity, delivery timeline, and preferred condition (new / surplus).
- Bulk Orders: Volume pricing available for orders of 5+ units. Lead time varies by stock availability.
- Urgent Requirements: Same-day quotation available for in-stock items. Call or WhatsApp: +0086 19859288691.
- Export & Cross-Border: We ship globally. Export documentation, commercial invoices, and packing lists provided for customs clearance.
Application-Specific FAQ
Q: Can the 1756-IG16 read signals from a 5 V incremental encoder directly?
A: Yes. The 1756-IG16 accepts standard TTL-level (5 VDC) signals. For quadrature encoder counting, pair it with a ControlLogix HSC (High-Speed Counter) module such as the 1756-HSC for full A/B/Z channel processing.
Q: Is the 1756-IG16 compatible with 24 VDC sensors?
A: No. This module is designed exclusively for 5 VDC TTL-level inputs. For 24 VDC DC inputs, use the 1756-IB16 or 1756-IB32 instead.
Q: What is the maximum input frequency the module can reliably capture?
A: The minimum RPI is 0.2 ms, supporting signal capture up to approximately 2.5 kHz at the module scan level. For higher-frequency pulse counting, use a dedicated HSC module.
Q: Does the 1756-IG16 require an external power supply for the field side?
A: Yes. The field-side TTL devices must be powered by an external 5 VDC supply. The module draws backplane power (5 VDC, 250 mA) from the ControlLogix chassis for its internal logic.
Q: Can I mix the 1756-IG16 with other 1756 I/O modules in the same chassis?
A: Yes. The 1756-IG16 occupies one slot in any standard 1756 chassis and can be mixed freely with other ControlLogix I/O modules.
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