Sharp JW-28KB

Technical Dossier

Product Details And Specifications

Sharp JW Series Technical Notes

The Evolution of JW Series Architecture

The JW Series progressed through several distinct hardware generations. Early units such as the JW-10K and JW-20K used a proprietary parallel backplane bus operating at TTL logic levels, with CPU scan times measured in tens of milliseconds and program memory limited to a few kilobytes of battery-backed CMOS RAM. The mid-generation JW-21K, JW-22K, and JW-28KB introduced expanded I/O addressing, improved instruction sets including PID and high-speed counter functions, and rack panel form factors compatible with both DIN-rail and 19-inch rack enclosures. The JW-28KB specifically serves as a rack panel interface component, providing the mechanical and electrical mounting structure for JW-series I/O and specialty modules within a standard rack chassis.

Later generations—the JW-32CUH, JW-33CUH, and JW-33CUH3—transitioned to higher-density backplane communication, reduced cycle times, and support for RS-232C and RS-485 serial links via dedicated communication modules. The JW-100CF compact fixed-I/O unit addressed applications requiring a self-contained controller without expansion racks. Compatibility between generations is constrained: early-generation I/O modules are not electrically compatible with JW-33 series CPUs without adapter hardware, and program memory formats differ between the JW-20K and JW-32CUH instruction sets. Engineers maintaining mixed-generation installations must verify backplane bus revision levels before substituting modules.

Sharp JW Series Full Catalog & Functionalities (SKU List)

The following SKUs represent verified components within the Sharp JW Series ecosystem, classified by functional category:

CPU & Controller Modules

• JW-10K: Entry-level CPU, 1K-step ladder program, parallel backplane bus, battery-backed RAM
• JW-20K: Mid-range CPU, 2K-step capacity, expanded instruction set, RS-232C port
• JW-21K: Enhanced CPU with PID function blocks, 4K-step program memory, DIN-rail mount
• JW-22K: High-capacity CPU, 8K-step program, high-speed counter input, extended addressing
• JW-32CUH: Advanced CPU module, 16K-step program, RS-485 network support, rack-mount format
• JW-33CUH: High-performance CPU, 32K-step capacity, multi-task execution, JW-33 backplane
• JW-33CUH3: Extended CPU variant, 64K-step program, enhanced floating-point arithmetic
• JW-100CF: Compact fixed-I/O controller, integrated 10 DI / 6 DO, standalone operation

Digital I/O Modules

• JW-1ADF: 16-point DC digital input module, 24VDC sink/source, screw terminal
• JW-2AD: 32-point DC digital input module, high-density format, common terminal grouping

Analog I/O Modules

• JW-1DA: 4-channel analog output module, 0–10V / 4–20mA selectable, 12-bit resolution

Communication & Network Modules

• JW-21MN: RS-232C communication adapter, point-to-point serial link, ASCII/binary protocol
• JW-22MN: RS-485 multi-drop communication module, up to 31 nodes, JW-NET protocol
• JW-232MT: Serial communication interface module, programmable baud rate, modem support

Rack & Infrastructure Components

• JW-28KB: Rack panel assembly, 19-inch rack format, provides mechanical mounting and backplane bus interface for JW-series expansion modules
• JW-10CM: Compact rack chassis, 4-slot configuration, integrated power distribution bus
• JW-20CM: Standard rack chassis, 8-slot configuration, supports mixed I/O and CPU modules

Sourcing Hard-to-Find & Obsolete Sharp JW Series Parts

Lifecycle extension support for the JW Series includes cross-reference analysis to identify functional equivalents where direct replacements are unavailable, and compatibility verification to confirm that substitute modules meet the electrical and timing specifications of the target installation.

Quality Control for the Sharp JW Series Range

Sharp JW Series modules present specific test challenges due to their proprietary backplane bus protocol and the age-related degradation patterns common in CMOS-based logic hardware. DriveKNMS applies a structured inspection and functional test protocol to all JW Series inventory prior to shipment:

• Visual inspection for capacitor ESR degradation, PCB trace corrosion, and connector pin condition
• Backplane bus signal integrity verification using JW-compatible rack test fixtures
• CPU module program memory read/write cycle testing with battery-backed RAM validation
• I/O module point-by-point functional test under rated voltage and load conditions
• Communication module loopback testing at all supported baud rates
• Burn-in period of minimum 48 hours under operational load for CPU and power supply components
• Final documentation of test results issued with each unit, available on request