Counting commands tells the controller what was requested; feedback answers a different observation question.
Draw command and observation separately
Oriental Motor distinguishes open-loop and closed-loop stepper architectures. The presence of a command count should not be labelled independent position feedback. Primary reference: Oriental Motor stepper architecture.
Identify the commanded movement, the physical quantity observed and the controller's use of that observation. A system may know its requested count while having a separate question about actual movement. The selected architecture and intended duty determine which evidence is needed.
A hypothetical position-evidence record
Imagine a fictional system sends 1,000 defined command increments and stores that count. No separate position observation is recorded. The log establishes the requested command sequence, not by itself the physical displacement achieved. Another architecture observes position through an identified feedback path; its observation should retain its own identity and interpretation.
Create columns for command source, command count, feedback source, observed quantity and comparison logic. The example reports no lost steps, HM positioning error or guaranteed benefit of one motor type. It names an evidence boundary rather than diagnosing a particular drive.
Specify the information the task needs
Ask whether the application requires requested position, independently observed position, an alarm or another defined function. A generic closed-loop label should not hide where feedback is measured or what controller behavior is actually included.
Keep the agreed architecture and verification scope with the system record. If the transmission changes, motor-side observation may need its application relationship reviewed. The guide helps a buyer define the intended information path without prescribing control settings or claiming that an encoder automatically verifies every downstream component's position and movement.
Customer Questions
Does a stored command count prove actual motion?
Not by itself. Identify the physical observation evidence.
Does an encoder automatically verify the whole downstream mechanism?
No. Preserve where it observes and how that relates to the task.
What should the architecture record show?
Command path, observation path and the controller's stated use of each.
Primary References
These references support the technical principles discussed in this guide. The worked examples and review questions are educational.
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