1746sc-CTR4 is a specialty 4-channel high-speed counter and flowmeter input module manufactured by Spectrum Controls for the Allen‑Bradley SLC 500 chassis platform. As a third-party SLC compatible I/O card, it is widely deployed for pulse counting, volumetric flow measurement, encoder position tracking and rate calculation where standard SLC discrete inputs cannot reliably capture fast pulse signals. It accepts both DC pulse signals and low-level AC variable reluctance inputs directly from turbine flow meters, eliminating the need for external pre-conditioning hardware on many custody transfer and batch filling applications.

Each of the four independent channels can be configured individually for simple up/down counting, rate monitoring, quadrature encoder, or flowmeter mode. External gate/enable and reset lines support gated counting, batch totalising and meter proving workflows. Onboard signal isolation, programmable scaling, K-factor mapping and digital filtering deliver stable total and flow rate readings even in electrically noisy plant environments. It works seamlessly with all standard SLC 500 processors including SLC 5/03, 5/04 and 5/05 and integrates natively within RSLogix 500 configuration. The module is end-of-life, making verified pre-tested units a critical spare for legacy flow and motion control systems.

We supply visually inspected and functionally tested 1746sc-CTR4 stock, including new old stock and refurbished surplus inventory. Every unit is validated for backplane communication, channel pulse capture, scaling logic and terminal integrity before shipment, ready for drop-in installation into existing SLC 500 racks.

Key Features

Spectrum Controls 1746sc-CTR4, 4-channel counter and flowmeter input module for SLC 500 Max input frequency up to 50 kHz for both DC and AC variable reluctance signals Multi-mode configuration: simple counter, rate, quadrature encoder, turbine flowmeter Supports 5 VDC, 12 VDC, 24 VDC pulse inputs and low-level AC VR flowmeter signals from 50 mV peak External gate, enable and reset inputs per channel for batch and meter proving Programmable K-factor, scaling, offset and filtering for engineering unit conversion Optical isolation between field inputs and SLC backplane Individual channel fault and status reporting accessible via controller data table Removable screw terminal block for simplified wiring and hot module exchange Compatible with SLC 5/03, SLC 5/04 and SLC 5/05 processors Designed for custody transfer, batch filling, speed and position monitoring ISA‑S71.04 G3 industrial environmental rating EOL legacy specialty I/O, available as tested surplus and NOS spare

Product Specifications

Part number: 1746sc-CTR4 Manufacturer: Spectrum Controls, compatible with Allen‑Bradley SLC 500 Platform: SLC 500 PLC Module type: High-speed counter / flowmeter input Channel count: 4 independent channels Max frequency: 50 kHz DC input levels: 5 VDC, 12 VDC, 24 VDC AC flowmeter input: 50 mV to 75 V peak variable reluctance Count range: Up to ±8,388,607 Modes: Up/down count, frequency rate, quadrature x1/x2/x4, flow totalising Isolation: Opto-isolated field inputs from backplane Update cycle: Fast per-channel acquisition with user-selectable filter Operating temperature: 0 °C to +60 °C Humidity: 5%–95%, non-condensing Backplane communication: SLC 500 backplane Software compatibility: RSLogix 500 Mounting: Standard SLC 500 I/O chassis slot Lifecycle status: End-of-life, no active new production

Typical Applications

Liquid and gas turbine flowmeter totalising Batch filling and blending control for chemical and paint lines Custody transfer and meter proving skids Conveyor speed and encoder position measurement Rotating equipment pulse pickup and speed monitoring Food & beverage batch process and ingredient dosing Refinery and pipeline flow monitoring legacy spares Water and wastewater pulse flow measurement Packaging machine high-speed part counting SLC 500 system spare stocking and outage maintenance

Why Choose Our 1746sc-CTR4 Module

We specialise in hard-to-source Spectrum Controls and Allen‑Bradley discontinued SLC 500 specialty I/O spare parts for plant maintenance, system integrators and automation contractors. Flow and custody transfer loops rely on consistent pulse capture, so each 1746sc-CTR4 undergoes pulse-response testing, scaling verification and backplane communication validation before dispatch.

We consolidate shipments alongside other SLC spares such as 1746-P3 power supplies, 1746-OA16 outputs and 1746-NR8 RTD modules. Formal commercial invoices, packing lists and optional test records are available on request. Tiered pricing and long-term plant spare frame agreements are supported for bulk procurement. Submit your full part list and required lead time for a custom quotation.

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FAQ

What is the difference between 1746sc-CTR4 and Rockwell 1746-HSCE2? 1746sc-CTR4 is a Spectrum Controls module optimised for flowmeter and general pulse counting with dedicated VR AC flowmeter support. 1746-HSCE2 is Rockwell’s native multi-channel high-speed counter, focused more heavily on quadrature motion control. They are not direct drop-in replacements and use different configuration data tables.

Can this module read variable reluctance turbine flow meters directly? Yes, it accepts low-level AC VR flowmeter signals without an external signal conditioner, one of its primary design advantages for flow applications.

Is it compatible with SLC 5/01 and SLC 5/02? It is primarily designed and tested for SLC 5/03, 5/04 and 5/05. Older 5/01 and 5/02 processors have limited backplane and interrupt capability and are not recommended.

Can multiple channels run in different modes at the same time? Yes, each channel can be independently set for counter, rate, encoder or flowmeter operation in RSLogix 500 configuration.

Is the 1746sc-CTR4 still manufactured? No, this is an end-of-life Spectrum Controls specialty I/O module. New factory stock is unavailable; supply is limited to new old stock and functionally tested surplus units.

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1746SC-CTR4