Specific Requirements of an ERP System for the Process Industry

1. Conversion process capability
In the process industry, the bill of materials (BOM) used in discrete manufacturing is replaced by the master product formula, or simply the formula. The formula requires a conversion table for measures, such as weights from grams to pounds, and must have the ability to record liquid units of measure, in both metric and US-standard. The formula must also record specific information related to product characteristics that can affect manufacturing processes. For example, in the blending process, the system can record product information such as percentage calculations of raw materials, and the effective specific gravity, potency, density, and number of reactives of those raw materials.

2. Interface to other modules
The master formula can also be linked to submodules like quality assurance (QA), procurement, inventory, and accounts payable (A/P) for government compliance and safety issues. Also, the manufacturer must be able to trace products in order to manage dating of inventory lot control and the amount of inventory available at the distribution level. Furthermore, there are government and regulatory concerns that deal with the nature of the materials, as there may be a controlled substance with specific shipping, handling, and storage regulations. Or, the manufacturing process may emit hazardous by-products. Or, there may be logistical concerns within the manufacturing process itself.
3. QA module and flexible formula adjustments
A process industry ERP system must also have a formulation-balancing operation based on the premise that the QA group tests random samplings of production batches. The system needs the ability to adjust, through a program logic control (PLC) interface, any variations in materials used and external factors such as humidity, temperature, cool-down speeds, etc. Also, the material flow and consumption is recorded back into the ERP system. The system's routing functionalities reflect those capabilities as a requirement or not, depending on the user's specifications.

4. Reworking all co-products and scrap materials
As a result of manufacturing processes, residual materials (by-products) may be created. These by-products can be collected as waste and reused. This is the case within the plastics industry, for which the collection and re-entry of materials into process creates very specific criteria. In the process industry, due to a continuous production flow operation, the production process generates a theoretical production yield, which may be calculated by the downstream packaging operation as units for case-pack quantities. The residual amount generated from the production process may vary within a percentage point, but in the downstream conversion process, the residual quantities may be aligned to complete full, case-size box quantities. By using flexible formulas, process ERP systems can demonstrate how the residual materials can be reworked from waste back into materials used in production.

5. Supply chain management (SCM)
Collaborative forecasting and planning are essential features of the process industry ERP system, especially for the automotive and consumer products industries. Some the most important functionalities include

* visibility over inventory across the global supply chain
* enterprise-wide planning in the areas of sales and marketing, procurement, and production
* the ability to integrate planning for what-if scenarios
* the ability to benchmark quality and vendor performance issues
* detailed reporting that highlights areas where parameters may be out of scope
* real-time available-to-promise (ATP) information for customer service

6. Process industry costing
The financial system for the process industry must also be able to provide for multiple-level formulas on the same production work order, and for outside processing at subcontract facilities. Given the nature of process industry products, most plants must operate on a continuous basis, which drives maintenance costs up. As a result, maintenance costs usually comprise 30 percent of a process industry plant's operating budget. Thus, an ERP system must integrate with some type of best-of-breed system to meet the requirements of the operation, and with some form of asset management system, which takes into account predictive and preventative maintenance.

ERP System Constraints in the Process Industry

For lack of an available solution designed for their needs, some process manufacturers have attempted to implement an ERP system for discrete manufacturing. As there are several fundamental differences between the operations and practices of process and discrete manufacturing, opting for such a stop-gap measure is not always effective. Process manufacturers have no doubt noted the constraints that are placed on their operations as a result of using a system that was not designed for their needs.

The nature of the process manufacturing business is such that it is difficult to manage inventories and profits. Process manufacturers experience large quantities of finished product in transit and of raw inventory. The products often have low yields with substantial scrap (fine chemicals, pharmaceuticals, or plastics).

Business dynamics is putting demands on ERP systems to help with

* maintaining a lead over competition
* simplifying the product lines
* responding to shorter product life cycles
* providing mass customizations (car options, computer system accessories, etc.)
* complying with regulations compliances

In an attempt to meet these demands, many manufacturers have looked at ways to improve supply chain optimization by re-examining manufacturing processes, relocating closer to markets, and looking at cheaper energy, transportation, and labor. The businesses' needs are such that an ERP system must be powerful enough and diverse enough in functionality to do more than simple process manufacturing.