SHARP ZW Series Modules: ZW-164S

Technical Dossier

Product Details And Specifications

SHARP ZW Series: Comprehensive Module Range and Technical Overview

The SHARP ZW series represents one of Japan's most widely deployed compact PLC families in heavy industrial environments. Installed across petrochemical refineries, chemical processing plants, nuclear facility auxiliary systems, and continuous manufacturing lines throughout Asia and the Middle East, the ZW series established SHARP's position as a credible automation supplier during the 1980s–2000s industrial expansion cycle. Its modular rack-based architecture, deterministic scan cycle, and broad I/O density made it a preferred choice for OEM machine builders and system integrators requiring a cost-controlled, field-proven controller platform. Today, the ZW series is in the mature-to-end-of-life phase; SHARP has discontinued active production of most ZW variants, making third-party spare parts sourcing and lifecycle extension support the primary operational concern for installed-base customers.

The Evolution of ZW Series Architecture

The ZW series was introduced as a successor to SHARP's earlier JW-series PLC platform, inheriting the JW instruction set while transitioning to a more compact form factor and higher I/O density per rack slot. Early ZW units (ZW-162S, ZW-164S, ZW-166S) used a parallel backplane bus operating at TTL logic levels, with CPU modules executing ladder logic at scan rates of 1–10 ms depending on program size. The series supported both fixed I/O configurations and modular expansion via dedicated expansion racks connected through proprietary ribbon or D-sub cables.

Mid-generation ZW modules introduced analog I/O capability (ZW-20DA1, ZW-24DA1) and limited communication adapters for RS-232C and RS-485 serial links, enabling basic SCADA integration. Later variants added support for SHARP's proprietary JW-NET industrial network, allowing multi-drop configurations across larger plant sections. The ZW series never adopted open fieldbus standards (PROFIBUS, DeviceNet, EtherNet/IP), which has contributed to its isolation from modern DCS migration projects and accelerated its obsolescence timeline. Compatibility between early and late ZW backplanes is limited; CPU firmware versions must be matched to I/O module generations to avoid bus arbitration faults.

SHARP ZW Series Full Catalog & Functionalities (SKU List)

The following SKUs represent the core ZW series module range. Each entry reflects a distinct hardware function within the ZW rack system.

ZW-162S: Compact CPU module, 16-point fixed I/O, 2K step program memory.
ZW-164S: Standard CPU module, 16-point I/O, 4K step memory, RS-232C port onboard.
ZW-166S: Enhanced CPU, 16-point I/O, 6K step memory, extended instruction set.
ZW-20EX1: 20-point DC input expansion module, sink/source configurable, 24VDC.
ZW-20AT1: 20-point transistor output module, NPN open-collector, 0.5A per point.
ZW-24RG1: 24-point relay output module, 2A/point, Form-A contacts, 250VAC rated.
ZW-28AT1: 28-point mixed I/O transistor module, 16DI / 12DO configuration.
ZW-32CT1: 32-point DC input module, high-density, common terminal block wiring.
ZW-40EX1: 40-point DC input expansion, dual common groups, 24VDC logic level.
ZW-40AT1: 40-point transistor output, high-density, NPN, 0.3A per point.
ZW-42RG1: 42-point relay output, dual-row terminal, 1A/point, general-purpose switching.
ZW-80EX1: 80-point DC input module, maximum density I/O for large machine control.
ZW-80AT1: 80-point transistor output, high-density NPN, requires external power supply.
ZW-162EX: CPU expansion module, extends program memory to 16K steps for ZW-162S base.
ZW-164EX: Memory expansion for ZW-164S, supports extended data register allocation.
ZW-20DA1: 2-channel analog output module, 4–20mA or 0–10V, 12-bit resolution.
ZW-24DA1: 4-channel analog output, 4–20mA, 12-bit, for process control valve positioning.

Sourcing Hard-to-Find & Obsolete ZW Series Parts

SHARP officially discontinued the ZW series product line. Authorized distribution channels no longer carry new stock, and factory repair services have been terminated. For plant operators maintaining ZW-based control systems, the only viable supply path is the secondary market and specialist industrial spare parts distributors.

DriveKNMS maintains a dedicated inventory program for end-of-life SHARP ZW modules. Our sourcing network spans decommissioned plant equipment, OEM overstock, and tested pull inventory from system integrators across Asia, Europe, and the Americas. All ZW modules in our inventory are subject to incoming inspection, functional verification, and storage in ESD-controlled environments. We support emergency breakdown orders with same-day quotation and priority airfreight dispatch. For customers managing multi-year maintenance contracts on ZW-equipped machinery, DriveKNMS offers consignment stocking agreements to guarantee parts availability against planned maintenance windows.

Quality Control for the ZW Series Range

The ZW series backplane bus and CPU-to-I/O communication architecture requires module-level functional testing rather than simple visual inspection. DriveKNMS applies the following verification protocol to all ZW inventory:

CPU modules (ZW-162S, ZW-164S, ZW-166S) are powered on a live ZW test rack, program memory is written and verified, and scan cycle timing is measured against factory specification. I/O modules are tested point-by-point using automated switching fixtures that verify input threshold voltage and output switching current for every channel. Relay output modules (ZW-24RG1, ZW-42RG1) undergo contact resistance measurement and 1,000-cycle endurance verification on a sample basis. Analog modules (ZW-20DA1, ZW-24DA1) are calibrated against a traceable reference standard and output linearity is confirmed across the full 4–20mA range. Modules that fail any test parameter are quarantined and not offered for sale. Test records are retained and available to customers on request.

For ZW series parts inquiries, availability checks, and emergency supply requests: