Flow Measurement & High-Speed Counting Solution — Allen-Bradley 1746SC-CTR4 | SLC 500 Series
Where This Product Is Used
The Allen-Bradley 1746SC-CTR4 is a specialty counter and flow meter input module designed for the SLC 500 programmable controller platform. It is deployed across demanding industrial environments where precise pulse counting and volumetric flow measurement are critical to process integrity:
- Water & Wastewater Treatment: Monitoring flow rates from turbine and paddle-wheel meters in pump stations, filtration systems, and distribution networks.
- Oil & Gas Pipelines: Accumulating pulse outputs from positive-displacement and Coriolis flow meters for custody-transfer and batch-control applications.
- Chemical & Pharmaceutical Processing: Tracking reagent dosing volumes with high-resolution pulse inputs to ensure recipe accuracy and regulatory compliance.
- Food & Beverage Production: Measuring ingredient flow in CIP (Clean-in-Place) systems and filling lines where sanitary flow meters output frequency signals.
- HVAC & Building Automation: Integrating with BTU meters and chilled-water flow sensors in large commercial facilities.
- Discrete Manufacturing: Counting encoder pulses for conveyor speed feedback, part counting, and production-rate monitoring on SLC 500-based machine cells.
Technical Specifications
| Parameter | Specification |
|---|---|
| Catalog Number | 1746SC-CTR4 |
| Platform | Allen-Bradley SLC 500 |
| Module Type | Counter / Flow Meter Input (Specialty I/O) |
| Number of Channels | 4 independent counter/flow channels |
| Input Signal Types | Pulse (NPN/PNP), quadrature encoder, frequency |
| Maximum Input Frequency | Up to 100 kHz per channel |
| Counter Resolution | 32-bit accumulator per channel |
| Flow Rate Calculation | Onboard frequency-to-engineering-unit conversion |
| Backplane Communication | SLC 500 local I/O backplane (1746 chassis) |
| Power Consumption | Supplied via SLC 500 backplane |
| Operating Temperature | 0 °C to 60 °C (32 °F to 140 °F) |
| Storage Temperature | −40 °C to 85 °C |
| Relative Humidity | 5 % to 95 % non-condensing |
| Weight | Approx. 200 g |
| Certifications | UL Listed, CE Marked, cUL |
Why Engineers Specify This Model
- Dedicated Onboard Processing: The 1746SC-CTR4 offloads counter and flow calculations from the SLC 500 CPU, eliminating scan-time jitter that would otherwise corrupt high-speed pulse data.
- 4-Channel Density: A single module slot handles four independent flow or counter inputs, minimizing chassis slots and wiring costs versus discrete HSC modules.
- 32-Bit Accumulators: Prevents rollover in long-run batch or totalization applications without requiring software workarounds.
- Direct Engineering-Unit Output: Flow rate values are presented in user-configured engineering units (GPM, L/min, m³/h) directly in the SLC data table — no ladder scaling required.
- Drop-in SLC 500 Compatibility: Fits any 1746 chassis slot; configured via RSLogix 500 without additional software licenses.
- Proven Field Reliability: Part of Rockwell Automation’s SLC 500 specialty I/O family with decades of installed-base validation in process industries.
Complete System Bill of Materials
A typical SLC 500 flow-monitoring panel using the 1746SC-CTR4 includes the following components. Konmask.com stocks or can source all items:
- 1746SC-CTR4 — Counter/Flow Meter Input Module (this listing)
- 1746-P2 or 1746-P4 — SLC 500 Power Supply
- 1747-L532 / 1747-L541 / 1747-L551 — SLC 5/03, 5/04, or 5/05 CPU
- 1746-A4 / 1746-A7 / 1746-A10 — 4-, 7-, or 10-slot 1746 Chassis
- 1746-IB16 / 1746-OB16 — Discrete I/O modules for auxiliary signals
- 1747-UIC — USB-to-DH-485 Programming Cable
- RSLogix 500 (Studio 5000 Logix Designer not required)
- Turbine / paddle-wheel / Coriolis flow meter with pulse output (field-supplied)
Compliance & Industry Standards
- UL 508 — Industrial Control Equipment
- CE Directive — EMC and Low Voltage compliance for EU markets
- cUL — Canadian safety certification
- RoHS — Restriction of Hazardous Substances compliant
- ATEX / IECEx: Module itself is non-Ex rated; install in purged enclosure or use Ex-rated barriers for hazardous-area applications
- ISA-5.1 — Instrumentation symbols and identification (applicable to system design)
Quality Assurance & Sourcing
Konmask.com specializes in authentic Allen-Bradley / Rockwell Automation components for industrial automation professionals:
- Every 1746SC-CTR4 unit is inspected for physical integrity, label authenticity, and firmware revision prior to dispatch.
- Units are sourced from authorized distribution channels and verified surplus inventories with full traceability documentation available on request.
- Packaging is anti-static ESD-safe with moisture-barrier sealing for long-term storage integrity.
- Batch and serial number records are retained for quality-audit purposes.
- 30-day return window for DOA (Dead on Arrival) units; warranty terms available upon inquiry.
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), email support@konmask.com for tiered pricing.
- Lead Time — In-stock units ship within 1–3 business days; out-of-stock units are sourced within 7–15 business days.
- Export & Cross-Border Orders — We support international shipments with commercial invoice, packing list, and HS code documentation (HS: 8537.10).
- Technical Pre-Sales Support — Contact our engineering team to confirm compatibility with your existing SLC 500 chassis revision and RSLogix 500 version.
Application-Specific FAQ
Q: Can the 1746SC-CTR4 accept signals from a 4–20 mA flow transmitter?
A: No. The 1746SC-CTR4 is a pulse/frequency input module. For 4–20 mA analog flow signals, use the 1746-NI4 or 1746-NI8 analog input modules instead.
Q: Is this module compatible with the MicroLogix 1100 or 1400?
A: No. The 1746SC-CTR4 is designed exclusively for the SLC 500 (1746 chassis) platform. MicroLogix controllers use a different I/O bus architecture.
Q: What is the maximum cable length from the flow meter to the module input?
A: Rockwell recommends shielded twisted-pair cable up to 30 m (100 ft) for frequencies above 10 kHz. For longer runs, use a signal conditioner or repeater.
Q: Can I use this module for quadrature encoder feedback?
A: Yes. The module supports quadrature (A/B phase) encoder inputs for direction-sensitive counting, making it suitable for bidirectional flow or position applications.
Q: Does the module retain accumulated counts through a power cycle?
A: Count values are stored in the SLC 500 data file. Retention through power loss depends on the CPU’s battery-backed RAM — ensure the CPU battery is serviceable.
Q: What RSLogix 500 version is required to configure this module?
A: RSLogix 500 version 7.0 or later is recommended. The module appears as a specialty I/O module in the I/O configuration tree and is configured via its module data file.
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