Motion & Counting Solution — Allen-Bradley 1756-HSC | ControlLogix Series
Where This Product Is Used
The Allen-Bradley 1756-HSC is a High-Speed Counter (HSC) module designed for the ControlLogix platform. It is deployed in applications that demand precise, high-frequency pulse counting and encoder feedback processing. Typical deployment environments include:
- CNC Machining Centers — Quadrature encoder position tracking for spindle and axis control
- Packaging & Filling Lines — Product counting, registration mark detection, and throughput monitoring
- Conveyor & Sorting Systems — Speed measurement and position verification via encoder input
- Web Tension & Winding Machines — Dancer roll position feedback and line speed synchronization
- Bottling & Labeling Equipment — High-speed pulse counting for label pitch and fill-volume verification
- Turbine & Flow Metering — Pulse-per-unit volumetric flow measurement in process industries
- Press & Stamping Lines — Stroke counting and die protection via proximity sensor inputs
- Robotics & Pick-and-Place — Resolver/encoder feedback integration within ControlLogix motion architectures
Technical Specifications
| Parameter | Value |
|---|---|
| Catalog Number | 1756-HSC |
| Brand / Manufacturer | Allen-Bradley (Rockwell Automation) |
| Platform | ControlLogix |
| Module Type | High-Speed Counter Module |
| Number of Counters | 4 independent counters |
| Output Type | 4 Current Sourcing DC Outputs |
| Maximum Input Frequency | Up to 1 MHz (single-ended); 250 kHz (differential) |
| Input Voltage Range | 5 V DC / 12 V DC / 24 V DC (software selectable) |
| Output Voltage | 10–30 V DC |
| Output Current (per point) | 1 A maximum |
| Counting Modes | Up/Down, Quadrature (x1, x2, x4), Period/Rate, Gate |
| Backplane Current (5 V) | 1.0 A |
| Backplane Current (24 V) | 3 mA |
| Operating Temperature | 0 °C to 60 °C (32 °F to 140 °F) |
| Storage Temperature | -40 °C to 85 °C |
| Relative Humidity | 5–95% non-condensing |
| Dimensions (H × W × D) | Fits standard ControlLogix chassis slot |
| Weight | Approx. 200 g |
| Certifications | UL, CE, CSA, RCM |
Why Engineers Specify This Model
- 1 MHz Counting Rate — Handles the fastest industrial encoders and proximity sensors without pulse loss, eliminating the need for external counter hardware.
- 4 Independent Sourcing Outputs — Each output can drive solenoids, relays, or indicator lights directly from the module, reducing wiring complexity and panel footprint.
- Quadrature x4 Resolution — Delivers four-times encoder resolution for sub-millimeter position accuracy in servo and stepper applications.
- Software-Selectable Input Voltage — Supports 5 V TTL, 12 V, and 24 V DC sensors on the same module, simplifying multi-sensor architectures.
- Native ControlLogix Integration — Communicates over the ControlLogix backplane with full RSLogix 5000 / Studio 5000 tag-based programming, no gateway required.
- Onboard Preset & Rollover — Configurable preset values and rollover counts enable autonomous output triggering without PLC scan-cycle dependency.
- Proven Field Reliability — Widely deployed across automotive, food & beverage, and discrete manufacturing for over two decades.
Complete System Bill of Materials
A typical ControlLogix high-speed counting system using the 1756-HSC includes the following components:
| Item | Catalog No. | Description |
|---|---|---|
| Controller | 1756-L7x / 1756-L8x | ControlLogix L7 or L8 Series CPU |
| Chassis | 1756-A4 / A7 / A10 / A13 | ControlLogix Backplane Chassis (4–13 slots) |
| Power Supply | 1756-PA72 / PB72 | ControlLogix AC or DC Power Supply |
| HSC Module | 1756-HSC | High-Speed Counter, 4 Sourcing DC Outputs |
| Communication | 1756-EN2T / EN3TR | EtherNet/IP Communication Module |
| Encoder (example) | 845H / 845T | Allen-Bradley Incremental Encoder |
| RTB / Wiring | 1756-TBCH / TBNH | Removable Terminal Block (cage clamp or screw) |
| Programming Software | 9324-RLD300ENE | Studio 5000 Logix Designer License |
Compliance & Industry Standards
- UL Listed — UL 508 Industrial Control Equipment
- CE Marked — EMC Directive 2014/30/EU; Low Voltage Directive 2014/35/EU
- CSA Certified — Canadian Standards Association industrial approval
- RCM Mark — Australian/New Zealand regulatory compliance
- RoHS Compliant — Restriction of Hazardous Substances Directive 2011/65/EU
- ATEX / IECEx — Not rated for hazardous locations; use appropriate barriers if required
- ISO 9001 — Manufactured under Rockwell Automation’s ISO 9001-certified quality system
Quality Assurance & Sourcing
Konmask.com sources the 1756-HSC through verified industrial distribution channels. Every unit offered is subject to the following quality controls:
- Visual Inspection — Label integrity, connector condition, and housing checked against OEM reference standards
- Firmware Version Verification — Module firmware series confirmed and documented prior to shipment
- Functional Bench Test — Counter inputs and sourcing outputs verified under load where applicable
- Anti-Counterfeit Screening — PCB markings, date codes, and component profiles cross-referenced against known-good units
- Traceability Documentation — Supply chain records retained; certificates of conformance available on request
- Secure Packaging — ESD-safe bags, foam-lined boxes, and tamper-evident sealing for international shipment
How to Source This Part
- Add to Cart — Click the purchase button above to place an order directly on Konmask.com.
- Request a Quote — For volume orders (5+ units) or project-based procurement, email support@konmask.com for a formal quotation within 24 hours.
- Verify Compatibility — Confirm your ControlLogix chassis series and firmware revision with our technical team before ordering if integrating into an existing system.
- Lead Time — In-stock units ship within 1–3 business days. Ex-stock international shipments via DHL / FedEx with full tracking.
- Payment — Accepts T/T bank transfer, PayPal, and major credit cards. Net-30 terms available for qualified accounts.
Application-Specific FAQ
Q: Can the 1756-HSC count quadrature encoder signals at full x4 resolution?
A: Yes. The module supports quadrature counting in x1, x2, and x4 modes. At x4, each encoder cycle generates four count events, maximizing positional resolution for servo feedback applications.
Q: What is the maximum input frequency supported?
A: Up to 1 MHz in single-ended mode and 250 kHz in differential mode. This covers virtually all industrial incremental encoders and proximity-based pulse generators.
Q: Are the 4 DC outputs sourcing or sinking?
A: All four outputs are current sourcing (PNP). They supply current to the load, making them compatible with standard NPN-input devices such as solenoid valves and indicator lamps.
Q: Does this module require a separate power supply for the outputs?
A: Yes. The output circuit requires an external 10–30 V DC field power supply connected at the terminal block. Backplane power is used only for module logic.
Q: Is the 1756-HSC compatible with both RSLogix 5000 and Studio 5000?
A: Yes. The module is fully supported in both RSLogix 5000 (v16+) and Studio 5000 Logix Designer (all versions), with Add-On Profiles (AOPs) available from Rockwell Automation’s Product Compatibility and Download Center (PCDC).
Q: Can I use this module in a GuardLogix safety system?
A: The 1756-HSC is a standard (non-safety) module. It can reside in a GuardLogix chassis in a standard slot but cannot be used as a safety-rated I/O device for SIL-rated functions.
Q: What is the difference between 1756-HSC and 1756-HSC/B?
A: The /B revision includes minor hardware updates for improved noise immunity. Both revisions are functionally equivalent and use the same firmware and AOP. Konmask.com will confirm the revision series at time of order.
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