Plan a PLC retrofit from legacy P&IDs.

A 1990s control panel with a discontinued PLC reaches end of life. Operations wants like-for-like behaviour on modern hardware, the P&IDs have been redlined by hand for two decades, and the retrofit hinges on a clean I/O list that maps the legacy points without losing any.

Start a workspace See pricing

Workflow.

01
Digitize the legacy P&ID set
Scan or pull the existing P&IDs into a workspace. Hand-marked redlines are common. High-resolution scans capture them. The extraction pulls instrument tags, signal classes, and equipment references from drawings older than the engineers reading them.
02
Reconcile against the legacy I/O list
Most retrofits start with an Excel I/O list that may or may not match the as-built drawings. Tagsight cross-references the extracted set against the legacy list and surfaces three buckets. Matched, missing-on-drawings, missing-on-list. The discrepancy report is the basis for site walks.
03
Export to the target PLC platform
Once the I/O baseline is reconciled, export to TIA Portal XML, Rockwell L5X, or PLCCreator. The new PLC project starts with a complete tag table that mirrors the validated as-built scope.

What you get.

Reconciled I/O list with legacy, drawing, list provenance per tag
Discrepancy report, matched, missing on either side
Target-platform export, TIA Portal, Rockwell, PLCCreator
MOC-ready change record showing the retrofit scope

FAQ.

01What if the legacy drawings have hand-marked redlines that never made it back to the controlled drawing.
What is on the drawing comes through, redlines included. Reconciliation against the legacy I/O list catches the inverse case. A tag in operations that never made it onto a drawing. Site walks resolve the remaining differences.
02Can the new PLC project start before the field walk is complete.
Yes. The 80 percent of tags that match cleanly become the seed PLC tag table on day one. The remaining 20 percent get added as the field walk closes them out.

Related

AudienceFor Controls Engineers AudienceFor Control System Integrators SolutionBrownfield P&ID digitization ConvertP&ID to I/O list ConvertI/O list to TIA Portal ConvertI/O list to Rockwell L5X

Plan a PLC retrofit from legacy P&IDs.

Workflow.

Digitize the legacy P&ID set

Scan or pull the existing P&IDs into a workspace. Hand-marked redlines are common. High-resolution scans capture them. The extraction pulls instrument tags, signal classes, and equipment references from drawings older than the engineers reading them.

Reconcile against the legacy I/O list

Most retrofits start with an Excel I/O list that may or may not match the as-built drawings. Tagsight cross-references the extracted set against the legacy list and surfaces three buckets. Matched, missing-on-drawings, missing-on-list. The discrepancy report is the basis for site walks.

Export to the target PLC platform

Once the I/O baseline is reconciled, export to TIA Portal XML, Rockwell L5X, or PLCCreator. The new PLC project starts with a complete tag table that mirrors the validated as-built scope.

FAQ.

01What if the legacy drawings have hand-marked redlines that never made it back to the controlled drawing.

What is on the drawing comes through, redlines included. Reconciliation against the legacy I/O list catches the inverse case. A tag in operations that never made it onto a drawing. Site walks resolve the remaining differences.

02Can the new PLC project start before the field walk is complete.

Yes. The 80 percent of tags that match cleanly become the seed PLC tag table on day one. The remaining 20 percent get added as the field walk closes them out.