**1. Introduction**

In producing hospital beds or hospital furniture, various manufacturing practices [1–3] and production systems [4–17] are applied in medical equipment industries, one of which is through the work-in-process (WIP) buffer control system and feeding material scenarios so that the process can run normally and produce the expected throughput. The WIP buffer control system and material feed scenario at the factory are known as the D (day) minus 1 production scenario.

Operational production activities are carried out through WIP buffer control and the material stock scenario at the factory using the day minus 1 rule. This rule is a time-based buffer production scenario in 1 day, ending at the finished goods assembly station used as the zero point (D0) from each workstation, pushed for 1 consecutive day to the beginning of the buffer. With the success of providing WIP buffers on D-1 and D-2 days, the product is certain to be ready on time.

Production activities are modeled using a mathematical model of the Heaviside step function [18] of the various production processes involved therein. With these mathematical equations, a production schedule model can be arranged in accordance with the specified production scenarios and it is possible to build a production simulation model in graphic and physical forms through a production dashboard provided for this purpose.

Using this production model, customer demand can be transformed into an integrated production schedule throughout the production flow, followed by production dispatching and execution. The integrated production schedule includes the supply of raw components, welding, paint, and product assembly to meet on time deliveries.

This production model was formed using two dashboards, namely, production planning and scheduling (PPS) dashboard for production planning and production execution management and production information management (PEMPIM) dashboard [19] for production management. By using this dashboard, customer orders can be integrated into the production schedule and the actual production process. In this management model, there is ease of material tracking [20–24] which is used to decide whether an expenditure schedule will be carried out or canceled.

The production dashboard is used to process customer demand data and is used as an input for creating integrated production schedules throughout the production flow, starting from the supply of raw components, welding, paint, and assembly to meet timely deliveries. The production planning schedule produced by the production dashboard is used for scheduling actual production.

Objective of D minus 1 production scenario is to solve manufacturing operation problems, which is implementing the SAP ERP software in a manufacturing company. SAP ERP is an enterprise resource planning software developed by the German company SAP SE. SAP ERP incorporates the key business functions of an organization [25]. The problem is the manufacturing operation in production floor failure to be integrated with the business in company level, and this makes a huge loss for the company [23].

The D minus 1 production scenario has been tested in a factory with actual production operation for various types of products (**Figure 1**). The actual production follows the production schedule in the D minus1 model scenario. Work-in-process buffer (WIP) and material supply scenarios at the plant are controlled using the ease of material tracking facilities. By carrying out actual production, the factory can produce products in the right amount and in time, which adhere to the production schedule so that finished goods can be delivered to customers on time.

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**Figure 2.**

*Planning horizon of the production model D minus 1.*

is available.

*D Minus 1 Production Scenario: Production Model for Produced Hospital Furniture*

The production model D minus 1 is a production control cycle model that uses N process stages, the planning time horizon is the delivery time of ST (days), the processing time cycle is ST-N + 1 (days) and the process period is daily. Production activities in this case use three stages process, so processing time is ST-2 (days), see

2.In this model production plans can be scheduled for all stations at every stage of the process, this production schedule accommodates the possibility of

3.The number and type of products that can be scheduled to be produced are various (depending on the requirements on the production floor).

4.From the scheduled production plan, it can be simulated the possibility of delays in the completion of the process so that through this simulation it can be

The success of the production process is influenced by the role of the material supply scenario in the factory [26, 27], and with a good scenario, it can be ensured that each station receives a timely supply and is easily handled in the production process, because each component is in a standard container rack, trolley, and box (RTB) and in a continuous range of motion so that the operator's movements are merely productive movements to produce added value, while nonproductive movements without producing added value must be kept as low as possible.

The basic principle of supply is to pull in complete quantities. This means that the supply of each process must be complete to form a one-piece flow, and after the material in the WIP buffer is finished, the supply can be withdrawn to the workstation, thus ensuring that the finished goods can be formed because each component

anticipated if a bottleneck is encountered in the process.

**2.2 Model material feed scenarios in the factory**

*DOI: http://dx.doi.org/10.5772/intechopen.93691*

The characteristics of this model are:

1.The effective process time for Tp referral is 8 h.

**2. D (day) minus 1 scenario**

**Figure 2**.

holidays.

**2.1 Definition of D (day) minus 1**

**Figure 1.** *Many kinds of hospital furniture. (A) Hospital bed. (B) Wheelchairs. (C) Transporting patients.*
