Warehouse control system

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A warehouse control system (WCS) is a software application that directs the real-time activities within warehouses and distribution centers (DC). As the “traffic cop” for the warehouse/distribution center, the WCS is responsible for keeping everything running smoothly, maximizing the efficiency of the material handling subsystems and often, the activities of the warehouse associates themselves. It provides a uniform interface to a broad range of material handling equipment such as AS/RS, carousels, conveyor systems, sorters, palletizers, etc. The primary functions of a WCS include:

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A warehouse management system (WMS) is a software application, designed to support and optimize warehouse functionality and distribution center management. These systems facilitate management in their daily planning, organizing, staffing, directing, and controlling the utilization of available resources, to move and store materials into, within, and out of a warehouse, while supporting staff in the performance of material movement and storage in and around a warehouse.

Order fulfillment

Order fulfillment is in the most general sense the complete process from point of sales inquiry to delivery of a product to the customer. Sometimes order fulfillment is used to describe the more narrow act of distribution or the logistics function, however, in the broader sense it refers to the way firms respond to customer orders.

Graphical user interface user interface allowing interaction through graphical icons and visual indicators

The graphical user interface is a form of user interface that allows users to interact with electronic devices through graphical icons and visual indicators such as secondary notation, instead of text-based user interfaces, typed command labels or text navigation. GUIs were introduced in reaction to the perceived steep learning curve of command-line interfaces (CLIs), which require commands to be typed on a computer keyboard.

Each major function is designed to work as part of an integrated process to effectively link the host systems with the lower level control system, while relieving the Host from the real-time requirements such as operator screens and lower level equipment control interfaces.

Control hierarchy

The typical warehouse/distribution center consists of a multi-tier control architecture in which each level in the control hierarchy has a defined role.

The upper most level of the control hierarchy is the warehouse management system (WMS), or host. This system handles the business aspects of the system such as receiving customer orders, allocating inventory, and generating shipping manifests or bills of lading) and invoices based on order fulfillment information and shipping information received from the material handling control system (WCS). It typically interacts with the material handling system on a non-real-time basis.

Bill of lading document issued by a carrier (or their agent) to acknowledge receipt of cargo for shipment

A bill of lading is a document issued by a carrier to acknowledge receipt of cargo for shipment. Although in England, the term once related only to carriage by sea, a bill of lading may be used for any type of carriage of goods.

Coordinating the activities of the various material handling sub-systems is the role of the warehouse control system (WCS). The WCS directs the "real-time" data management and interface responsibilities of the material handling system as well as provides common user interface screens for monitoring, control, and diagnostics. As the focal point for managing the operational aspects of the material handling system, the WCS provides the critical link between the non-real time based host and the real-time MHE control system. It receives information from the upper level Host and coordinates the various real-time control devices (conveyors, print and apply applicators, etc.) to accomplish the daily workload. At each decision point, the WCS determines the most efficient routing of the product and transmits directives to the equipment controllers to achieve the desired result. At the lowest level, closest to the physical equipment, are the equipment controller(s). These controllers are typically some form of a programmable logic controller (PLC) or a dedicated, real-time PC control system. They interface to peripheral Input/Output (I/O) devices such as photo-eyes scanners, motors, etc. as well as data collection devices such as bar code scanners (barcode reader) and weigh scales and are responsible for the physical operation of the material handling equipment. The equipment controllers are also responsible for the physical handling of product and tracking it from point-to-point based on the direction from the upper level control systems. Typically a single controller is only concerned with the operations of a defined area or sub-system of the overall material handling system.

A programmable logic controller (PLC) or programmable controller is an industrial digital computer which has been ruggedized and adapted for the control of manufacturing processes, such as assembly lines, or robotic devices, or any activity that requires high reliability control and ease of programming and process fault diagnosis.

Personal computer Computer intended for use by an individual person

A personal computer (PC) is a multi-purpose computer whose size, capabilities, and price make it feasible for individual use. Personal computers are intended to be operated directly by an end user, rather than by a computer expert or technician. Unlike large costly minicomputer and mainframes, time-sharing by many people at the same time is not used with personal computers.

Barcode reader electronic device that can read and output printed barcodes to a computer

A bar code reader is an electronic device that can read and output printed barcodes to a computer. Like a flatbed scanner, it consists of a light source, a lens and a light sensor translating for optical impulses into electrical signals.Additionally, nearly all barcode readers contain decoder circuitry analyzing the bar code's image data provided by the sensor and sending the barcode's content to the scanner's output port.

Ultimately, the control hierarchy within the distribution center reflects the organizational structure of their human counterparts. The management staff (or the WMS) determines the workload to be accomplished for the day while the supervisory staff (WCS) oversees the real-time activities of the warehouse associates (equipment controllers) to complete the daily activities. Each warehouse associate is assigned a specific task based on their area of expertise (order selection – carousel/Pick To Light, transportation - conveyors, etc.). As each operator completes their individual assignment, the supervisor (WCS) assigns the next task based on the current workload. As orders are completed, the (WCS) supervisor reports back to (WMS) management the status of the orders along with any pertinent order information.

Best practice

See also

Document automation is the design of systems and workflows that assist in the creation of electronic documents. These include logic-based systems that use segments of pre-existing text and/or data to assemble a new document. This process is increasingly used within certain industries to assemble legal documents, contracts and letters. Document automation systems can also be used to automate all conditional text, variable text, and data contained within a set of documents.

Enterprise resource planning refers to the corporate task of optimizing the existing resources in a company

Enterprise resource planning (ERP) is the integrated management of core business processes, often in real-time and mediated by software and technology.

Inventory management software is a software system for tracking inventory levels, orders, sales and deliveries. It can also be used in the manufacturing industry to create a work order, bill of materials and other production-related documents. Companies use inventory management software to avoid product overstock and outages. It is a tool for organizing inventory data that before was generally stored in hard-copy form or in spreadsheets.

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Supervisory Control and Data Acquisition (SCADA) is a control system architecture that uses computers, networked data communications and graphical user interfaces for high-level process supervisory management, but uses other peripheral devices such as programmable logic controller (PLC) and discrete PID controllers to interface with the process plant or machinery. The use of SCADA has been also considered for management and operations of project-driven-process in construction.

Logistics management of the flow of resources

Logistics is generally the detailed organization and implementation of a complex operation. In a general business sense, logistics is the management of the flow of things between the point of origin and the point of consumption in order to meet requirements of customers or corporations. The resources managed in logistics may include tangible goods such as materials, equipment, and supplies, as well as food and other consumable items. The logistics of physical items usually involves the integration of information flow, materials handling, production, packaging, inventory, transportation, warehousing, and often security.

A distributed control system (DCS) is a computerised control system for a process or plant usually with a large number of control loops, in which autonomous controllers are distributed throughout the system, but there is central operator supervisory control. This is in contrast to systems that use centralized controllers; either discrete controllers located at a central control room or within a central computer. The DCS concept increases reliability and reduces installation costs by localising control functions near the process plant, with remote monitoring and supervision.

Logistics automation

Logistics automation is the application of computer software and/or automated machinery to improve the efficiency of logistics operations. Typically this refers to operations within a warehouse or distribution center, with broader tasks undertaken by supply chain management systems and enterprise resource planning systems.

Distribution center

A distribution center for a set of products is a warehouse or other specialized building, often with refrigeration or air conditioning, which is stocked with products (goods) to be redistributed to retailers, to wholesalers, or directly to consumers. A distribution center is a principal part, the order processing element, of the entire order fulfillment process. Distribution centers are usually thought of as being demand driven. A distribution center can also be called a warehouse, a DC, a fulfillment center, a cross-dock facility, a bulk break center, and a package handling center. The name by which the distribution center is known is commonly based on the purpose of the operation. For example, a "retail distribution center" normally distributes goods to retail stores, an "order fulfillment center" commonly distributes goods directly to consumers, and a cross-dock facility stores little or no product but distributes goods to other destinations.

Computer-integrated manufacturing manufacturing approach of using computers to control the entire production process

Computer-integrated manufacturing (CIM) is the manufacturing approach of using computers to control entire production process. This integration allows individual processes to exchange information with each other and initiate actions. Although manufacturing can be faster and less error-prone by the integration of computers, the main advantage is the ability to create automated manufacturing processes. Typically CIM relies of closed-loop control processes, based on real-time input from sensors. It is also known as flexible design and manufacturing.

Automated storage and retrieval system Robotic warehouse for physical objects

An automated storage and retrieval system consists of a variety of computer-controlled systems for automatically placing and retrieving loads from defined storage locations. Automated storage and retrieval systems (AS/RS) are typically used in applications where:

Industrial control system (ICS) is a general term that encompasses several types of control systems and associated instrumentation used for industrial process control.

Material handling equipment is mechanical equipment used for the movement, storage, control and protection of materials, goods and products throughout the process of manufacturing, distribution, consumption and disposal. The different types of handling equipment can be classified into four major categories: transport equipment, positioning equipment, unit load formation equipment, and storage equipment.


IEC 60870 part 6 is one of the IEC 60870 set of standards which define systems used for telecontrol in electrical engineering and power system automation applications. The IEC Technical Committee 57 have developed part 6 to provide a communication profile for sending basic telecontrol messages between two systems which is compatible with ISO standards and ITU-T recommendations.

Material handling sub-discipline of mechanical engineering

Material handling involves short-distance movement within the confines of a building or between a building and a transportation vehicle. It uses a wide range of manual, semi-automated, and automated equipment and includes consideration of the protection, storage, and control of materials throughout their manufacturing, warehousing, distribution, consumption, and disposal. Material handling can be used to create time and place utility through the handling, storage, and control of material, as distinct from manufacturing, which creates form utility by changing the shape, form, and makeup of material.

Wave picking is used to support management and workers via a warehouse management system (WMS) in several ways, to support the planning and organizing of the daily flow of work of a warehouse or distribution center. Wave picking is an application of short-interval-scheduling. Managers, using a WMS, may assign groups of orders into short intervals called "waves", to initially simulate the flow for the day, consistent with the order departure plan and available labor. When the plan is satisfactory, it is accepted. The WMS will then release the waves to the warehouse sequentially throughout the day, to allow managers to coordinate the several parallel and sequential activities required to complete the daily work plan. One of the objectives of wave picking is to minimize the variation of workload in each work function by wave. The wave planning data includes the workload by order or function, providing management the information to calculate staff requirements to guide the assignment of staff by function, with the reasonable expectation that the work in each function, within each wave. Waves are often constructed to last between 1 and 4 hours, with resulting 8 to 2 waves in a shift.

Order processing is the process or work-flow associated with the picking, packing and delivery of the packed items to a shipping carrier. Order processing is a key element of order fulfillment. Order processing operations or facilities are commonly called "distribution centers".

Manufacturing execution systems (MES) are computerized systems used in manufacturing, to track and document the transformation of raw materials to finished goods. MES provides information that helps manufacturing decision makers understand how current conditions on the plant floor can be optimized to improve production output. MES works in real time to enable the control of multiple elements of the production process.

Distribution Center Management System (DCMS) is a user friendly Warehouse Management System (WMS), designed to track the activities performed in a Distribution Center (DC)/ Warehouse. It is created and owned by a private company called Eclipse Systems Pvt Ltd. It automates the entire process flow of receiving, managing and shipping goods to customers from the warehouse. DCMS solutions are designed for both large and small scale businesses. In January 2015, the product went open source.

Dematic business

Dematic is a supplier of integrated automated supply chain technology, software and services. With a growth rate of 25% in 2016 Dematic is listed as the world's third-largest materials handling systems supplier. The company employs over 6,000 people and has engineering centres and manufacturing facilities in the United States, Mexico, Australia, Germany, Italy, China and Czech Republic. Its customer base includes small, medium and large companies.

Warehouse Execution Systems (WES) are computerized systems used in distribution operations (Logistics) and are functionally equivalent to a manufacturing execution system or MES. Distribution operations are a form of a manufacturing operation that receive, store and track inbound material and then select and combine (assemble) various materials to form a finished product, order, or shipment.

Omnichannel Order Fulfillment is a material handling fulfillment strategy and process that treats inventory as fully available to all channels from one location. While the internal fulfillment process may diverge to optimize the operations, the outbound process only diverges at the point of pack out and shipping.

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