Indagate
No model, release or connector reaches a device until it has been tested against that specific device. Identity, fit and reach are verified before install — and the evidence outlives the deployment.
In 1973 British Museum conservation scientist Andrew Oddy published a test that exposed silver, copper and lead coupons to a candidate material before that material was allowed anywhere near an irreplaceable object. After 28 days the coupons were inspected. The verdict was one of three: rejected, temporary, or permanent.
The insight is that you do not test the object — you test the thing you are about to introduce, under the conditions it will actually meet. We apply the same discipline to software reaching industrial hardware. A model is a candidate material. Your PLC-connected line is the irreplaceable object.
Publisher, version and SHA-256 digest must match the signed manifest. An unsigned or unmanifested build fails here and goes no further.
Memory, runtime and accelerator requirements must sit inside the measured envelope of the named device — not a device class, and not a datasheet figure.
What the candidate is permitted to touch, and what you granted it on that device. A candidate that asks for more than the grant fails regardless of how well it performs — and a grant it never requested is never issued.
A candidate arrives with its publisher, version, digest, intended role, requested reach and target device.
Three coupons run against the specific device the candidate wants to reach — not a representative one.
A pass may install to a versioned slot. A fail never receives an edge directive.
Evidence and verdict stay on record, so you can answer what ran, on what, and why.
That question arrives after an incident, during a customer audit, or from a regulator. Without an admission record the honest answer is a reconstruction from deployment logs and memory.
An Oddy record answers it directly: which artifact, which digest, on which device, admitted when, under what reach, by whose signature.
Bring a model you are considering and the device you want it on. The free audit runs the three coupons against that pairing and returns the record it produces.