Product Details

Baumuller 3.7818D, also marked as 37818D, is a legacy rack plug‑in high speed counter board and pulse capture PCB built for Baumuller rack‑based automation and servo control systems. This high speed counter board captures fast quadrature pulses, frequency signals and trigger pulses from encoders, flow meters and position sensors, then transmits counted values and frequency data to the rack master controller. The pulse capture PCB adopts high‑speed differential receivers, anti‑aliasing filtering circuits and latch logic to maintain counting accuracy even for rapid pulse trains. It supports configurable counting modes, preset value comparison and hardware trigger output when target counts are reached. The multi‑layer FR4 circuit board is conformal coated to protect delicate high‑speed traces and components against dust, moisture and corrosive vapors inside industrial control cabinets. As an obsolete and hard‑to‑source discontinued spare, it serves as a direct drop‑in replacement to restore high‑speed pulse acquisition and position preset functions for ageing Baumuller control racks.

Basic Parameters

Brand: Baumuller

Model: 3.7818D, alternative marking: 37818D

Product Type: High‑speed pulse counter and capture PCB card

Main Function: Quadrature pulse counting, frequency measurement, preset comparison, hardware latch capture, pulse signal conditioning

Interfaces: Pulse signal terminal block, rack backplane edge connector, channel status and fault LED indicators

PCB Treatment: Conformal coated multi‑layer circuit board, UL 94V‑0 flame retardant

Mounting: Plug‑in installation for compatible legacy Baumuller control racks

Auxiliary Supply: 24 V DC logic supply

Net Weight: Approximately 230 g

Condition: Original discontinued industrial spare

Supported Functions

This high speed counter board supports precise pulse counting and position preset capture for automated machinery. The pulse capture PCB continuously samples incoming high‑speed pulse signals, accumulates position counts and compares real‑time readings against user‑defined preset values. It generates fast hardware trigger signals once the preset count is hit, independent of main controller scan cycles. It also detects signal loss, phase error and over‑frequency faults and sends warning messages to the master control unit. It works cooperatively with encoder feedback boards, fieldbus modules and digital I/O boards to realize fixed‑length cutting, positioning indexing and flow totalization. If this frequency counting card fails, the system loses high‑speed pulse measurement and preset trigger functions, and precision positioning sequences cannot run normally.

Core Functions

The core function of this high speed counter board is to offload high‑frequency pulse counting tasks from the main rack controller. It captures quadrature encoder pulses and converts pulse information into position, speed and frequency data. Built‑in hardware latching guarantees accurate snapshot of position at the moment an external trigger arrives. This pulse capture PCB acts as an essential spare to rebuild high‑speed measurement channels of legacy motion machinery and retain original indexing and length‑control performance.

Hardware Specifications & Environmental Features

Operating Temperature: 0°C ~ +60°C

Storage Temperature: -20°C ~ +75°C

Relative Humidity: 5%–95%, non‑condensing

Housing: Bare coated PCB with differential pulse screw terminals

Protection: ESD protection for pulse ports, phase error detection, over‑frequency alarm, IP20

Anti‑interference: Differential signal input and high‑frequency filtering circuits to suppress electromagnetic noise inside cabinets

Compatibility: Suitable for legacy Baumuller modular control racks and matched servo drive units

Industry Applications: Applied in legacy petrochemical distributed control, old paper making production automation, material handling conveyor lines, packaging and textile machinery, water treatment remote signal collection and large conveyor remote I/O control racks.

Note: Confirm 800 series backplane compatibility, pulse signal type, counting mode and preset logic before ordering.

This is from our current stock.

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