Try MES software for complex aerospace and defense manufacturing for 30 days
Siemens offers a free 30-day trial of Opcenter Execution Discrete, its Manufacturing Execution System (MES) for complex discrete manufacturing.
In Siemens’ trial navigation, the evaluation is labeled “Opcenter Execution for A&D.” The underlying software, however, is Opcenter Execution Discrete rather than a separate aerospace-only edition.
That distinction is worth understanding.
Opcenter Execution Discrete is used across several discrete manufacturing industries, but Siemens specifically positions it for aerospace and defense manufacturers and suppliers, where production often involves complex assembly, low volumes, high product variation, strict quality requirements and close coordination between engineering and manufacturing.
What Is Opcenter Execution Discrete?
Opcenter Execution Discrete is Siemens’ MES for manufacturers that build discrete products rather than processing continuous materials.
Typical users include manufacturers in:
- Aerospace and defense
- Automotive
- Heavy equipment
- Energy
- Industrial machinery
- Complex parts manufacturing
- Complex assembly
The software helps coordinate and record what happens during production.
It can connect production plans, work orders, operators, machines, materials, tools, work instructions and quality requirements so manufacturers have a digital record of how a product was actually built.
Siemens describes the current product as supporting both complex assembly and job-shop environments as well as more repetitive discrete manufacturing.
In Plain English: What Does It Do?
Imagine an aerospace supplier receives an order to manufacture a complex aircraft component.
Engineering has already defined what the product should be.
Manufacturing planning has determined how it should be made.
Now the factory has to actually build it.
Someone needs to know:
- Which work order is ready
- Which operation comes next
- Which materials are required
- Which tools should be used
- Which machine is available
- Whether the operator has the required qualifications
- Which work instructions apply
- Which inspections must be completed
- Whether a problem occurred
- Whether rework was required
- Exactly what happened during production
Opcenter Execution Discrete helps manage and document that execution process.
An MES is therefore not primarily about designing the aircraft part or planning the factory months in advance.
It is about answering:
What should happen on the shop floor right now, and what actually happened when we built this product?
Why Is Siemens Promoting This Trial for Aerospace & Defense?
Aerospace and defense manufacturing creates an unusually difficult MES problem.
Production frequently combines:
- Low volumes
- High product complexity
- Frequent configuration differences
- Long manufacturing cycles
- Manual assembly
- Skilled labor
- Extensive inspection
- Strict traceability
- Engineering changes
- Rework and nonconformance
- Detailed documentation
Siemens specifically highlights aerospace and defense as an important market for Opcenter Execution Discrete because these manufacturers often operate in high-complexity, low-volume environments.
Siemens also emphasizes close integration between MES and PLM for aerospace and defense, where engineering and manufacturing information must remain aligned as complex products move through production.
Is “Opcenter Execution for A&D” a Separate Product?
No — not according to Siemens’ current product information.
Siemens labels the trial Opcenter Execution for A&D in its trial navigation, but the software behind the evaluation is Opcenter Execution Discrete.
Aerospace and defense is one of the industries for which Siemens has configured and positioned the product.
That means manufacturers should not expect to find a separate commercial product called “Opcenter Execution for A&D.”
Instead, think of it as:
Opcenter Execution Discrete, evaluated from an aerospace and defense manufacturing perspective.
What Is a Manufacturing Execution System?
A Manufacturing Execution System, or MES, manages and records production activity between planning systems and the factory floor.
ERP may tell the company:
We have an order to build this product.
PLM may define:
This is the approved product definition and manufacturing plan.
MES helps answer:
How are we actually building it?
That can include:
- Releasing production orders
- Guiding operators
- Recording completed operations
- Tracking materials
- Managing work instructions
- Recording inspections
- Tracking production status
- Managing exceptions
- Maintaining traceability
MES provides the operational bridge between digital product information and physical manufacturing.
Why MES Matters for Complex Aerospace Assembly
Aerospace production often involves much more than moving a part through an automated line.
Consider assembling part of an aircraft structure.
The work may require:
- A particular revision of an engineering document
- Specific materials
- Qualified personnel
- Approved tooling
- Multiple assembly steps
- Torque requirements
- Inspection checkpoints
- Sign-offs
- Nonconformance procedures
- Complete production history
An operator cannot simply build from memory.
The production system has to ensure that the right person performs the right operation using the right information and resources.
Opcenter Execution Discrete is designed to manage those kinds of sequential manufacturing activities.
Work Instructions at the Point of Production
One important MES function is delivering the correct work instructions to the shop floor.
In aerospace and defense manufacturing, an outdated instruction can create serious problems.
Manufacturing information may include:
- Assembly instructions
- Drawings
- Specifications
- Material requirements
- Tooling instructions
- Inspection requirements
- Process documentation
Opcenter Execution Discrete can associate production operations with the information and resources required to perform them.
The current software supports relationships between operations and items including materials, machines, tools, documents, work instructions, inspections, human resources and skills.
Operator Skills and Qualifications
Not every worker may be qualified to perform every aerospace manufacturing task.
Certain operations may require:
- Specialized training
- Certifications
- Particular skills
- Experience with specific processes
Opcenter Execution Discrete can include human-resource and skills requirements as part of manufacturing planning and execution.
That gives manufacturers another way to ensure production work is performed under the correct conditions.
Quality Inspections During Production
Aerospace quality cannot simply be checked at the end of production.
Inspection requirements may occur throughout manufacturing.
Opcenter Execution Discrete can associate quality inspections with manufacturing operations so inspection becomes part of the production workflow rather than a completely separate activity.
That can help answer questions such as:
- Was the required inspection completed?
- What result was recorded?
- Which production order was affected?
- Which product or assembly was inspected?
- What happened after a problem was discovered?
What Happens When Something Goes Wrong?
Complex manufacturing rarely proceeds perfectly.
An operator may discover:
- Incorrect material
- A damaged component
- A dimensional problem
- Missing tooling
- An unclear instruction
- A machine problem
- A process issue
- A quality failure
The current Opcenter Execution Discrete release includes functionality allowing shop-floor users to initiate problem requests directly from the operator environment.
Those requests can move through a workflow covering reporting, ownership, investigation, resolution and auditability.
For aerospace manufacturing, the ability to document what went wrong and what happened afterward can be just as important as recording successful production.
Manufacturing Traceability
Traceability is another important MES capability.
Manufacturers may need to determine:
- Which material went into a product
- Which operation was performed
- Which machine was used
- Which operator performed the work
- Which documents applied
- Which inspections were completed
- Whether rework occurred
The objective is to preserve the manufacturing history of the product.
That becomes particularly important when investigating quality problems or demonstrating that required manufacturing procedures were followed.
MES and PLM Need to Work Together
Aerospace manufacturing creates a particularly strong connection between PLM and MES.
PLM manages the evolving digital definition of the product and manufacturing plan.
MES executes that plan on the factory floor.
If engineering changes a product, manufacturing eventually needs to receive the correct updated information.
Siemens specifically highlights integration between Opcenter Execution Discrete and its PLM environment, including Teamcenter and Easy Plan, as part of its strategy for complex aerospace and defense assembly.
The objective is to reduce the gap between:
What engineering says should be built
and
what manufacturing actually builds.
Bills of Process and Complex Assembly
Aerospace manufacturing often requires more than a simple list of parts.
Manufacturers also need to define the sequence of manufacturing activities required to create the product.
This is sometimes represented through a Bill of Process (BOP).
The current Opcenter Execution Discrete release includes tools for creating master plans and defining BOP structures, including relationships among materials, machines, tools, documentation, work instructions, inspections and personnel requirements.
That makes the software especially relevant to products whose manufacturing process is nearly as complex as the product itself.
Connection to CNC Manufacturing
Opcenter Execution Discrete can also connect manufacturing execution with CNC production.
The current release includes integration with Shopfloor Connect for retrieving, previewing and transferring part programs to CNC machines.
When data is imported from Teamcenter, the system can also create related equipment and DNC information automatically.
For manufacturers producing complex machined aerospace components, that helps connect manufacturing planning, NC programming and execution.
What Can You Evaluate During the 30-Day Trial?
Siemens describes the evaluation as a 30-day Manufacturing Execution System trial focused on improving manufacturing visibility, managing resources, maintaining product quality and reducing time-to-market.
During the trial, do not simply evaluate whether you like the interface.
Follow the manufacturing process.
Start With a Production Order
Can you understand what needs to be built and what operations must be completed?
Examine the Work Instructions
Can an operator easily determine what to do next?
Are the required materials, documents, tools and instructions clearly associated with the operation?
Look at Skills and Resources
Can the system identify what equipment and personnel are required?
Follow the Product Through Production
Can you see which operations are complete and which remain?
Record an Inspection
How naturally does quality fit into the manufacturing workflow?
Create a Problem
See what happens when production does not proceed according to plan.
Can the problem be recorded, investigated and resolved without losing its connection to the manufacturing context?
Look for Traceability
Can you reconstruct what happened to a particular product?
Think About an Engineering Change
Consider what would happen if engineering changed the product or manufacturing plan.
How would updated information reach production?
What Should Aerospace and Defense Manufacturers Pay Particular Attention To?
Configuration Complexity
Aerospace manufacturers may build many variations of similar products.
Determine whether the MES can manage the level of configuration complexity found in your production environment.
Low-Volume Production
Many MES systems originated in repetitive manufacturing environments.
If you manufacture highly complex products in small quantities, evaluate whether the software still feels natural when every unit may be slightly different.
Manual Operations
Look closely at the operator experience.
An aerospace MES may be used extensively by skilled workers performing manual assembly, inspection and rework.
Engineering Changes
Determine how product and process changes would flow from engineering into manufacturing.
Quality and Traceability
Evaluate whether the system creates the production history your customers, quality teams and regulatory requirements demand.
Integration
MES rarely operates alone.
Identify how Opcenter Execution Discrete would need to connect with:
- PLM
- ERP
- Quality systems
- CNC systems
- Planning and scheduling
- Shop-floor equipment
What the Trial May Not Tell You
A 30-day MES trial can demonstrate workflows and capabilities.
It cannot fully reproduce the difficulty of implementing MES in a real aerospace manufacturing environment.
A production deployment may involve:
- ERP integration
- PLM integration
- Data migration
- Manufacturing planning
- Equipment integration
- Work instruction preparation
- User roles
- Cybersecurity
- Quality processes
- Operator training
- Existing shop-floor systems
- Regulatory and contractual requirements
The most important question after the trial may therefore be:
How much work will it take to make Opcenter Execution Discrete accurately represent our manufacturing process?
That is different from asking whether the software itself is capable.
Opcenter Execution Discrete Trial at a Glance
| Software | Siemens Opcenter Execution Discrete |
| Siemens trial navigation label | Opcenter Execution for A&D |
| Category | Manufacturing Execution System (MES) |
| Trial length | 30 days |
| Primary focus | Manufacturing execution and complex discrete production |
| Aerospace & defense support | Yes |
| Complex assembly | Yes |
| Low-volume/high-variation manufacturing | Yes |
| Production order execution | Yes |
| Work instructions | Yes |
| Quality inspections | Yes |
| Skills/resources | Supported |
| Problem management | Yes |
| PLM integration | Strong emphasis, including Teamcenter/Easy Plan |
| Best suited for | Aerospace and defense manufacturers, suppliers and complex discrete manufacturers |
Try Opcenter Execution Discrete for Aerospace & Defense
The Siemens trial navigation calls this evaluation Opcenter Execution for A&D, but the product being evaluated is Opcenter Execution Discrete.
That is an important distinction, but it should not obscure why Siemens associates the trial with aerospace and defense.
The manufacturing problems are a strong match.
Aerospace manufacturers must coordinate complex assemblies, skilled workers, materials, tooling, inspections, engineering changes and detailed production records — often while producing relatively small quantities of highly complicated products.
During the 30-day trial, follow one product all the way through the manufacturing process.
Ask:
What is supposed to happen next?
Does the operator have the right information?
Are the right people and resources available?
Can quality requirements be recorded during production?
What happens when something goes wrong?
Can we reconstruct exactly how this product was built?
If the software can make those answers easier to obtain while preserving the control and traceability aerospace manufacturing requires, the trial has demonstrated the real purpose of MES.