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sylo-plc-comms

v0.1.1

Published

PLC comms layer for Studio 5000/Logix — CIP (EtherNet/IP via ciplogix, vendored wheel) controller info + tag reads/writes, and OPC UA (asyncua) browse/read/write. No Logix Designer SDK required.

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Links

Git

Maintainers

yeti-trixyeti-trix

Keywords

pi-package

Readme

sylo-plc-comms

Sylo package: PLC comms layer for Studio 5000/Logix — CIP (EtherNet/IP via ciplogix, vendored wheel) controller info + tag reads/writes, and OPC UA (asyncua) browse/read/write against the controller's OPC UA server. No Logix Designer SDK required.

Split out of sylo-allen-bradley on 2026-09-09. Sibling packages in this bundle:

  • sylo-allen-bradley — Logix Designer SDK wrapper (.acd upload/download, L5X export/import). SDK not bundled.
  • sylo-logicforge — L5X parse/IO-scaffold, Parse Rules UI, bundled LogicForge backend.

Tools

| Tool | What it does | |---|---| | plc_comms_cip_plc_info | Full controller attributes (read-only CIP Identity) | | plc_comms_cip_tag_list | Controller + program tag list (read-only) | | plc_comms_cip_tag_read | Read one/many tags (pycomm3 syntax) | | plc_comms_cip_tag_write | Write one/many tags — allowlist-gated | | plc_comms_opcua_status | Probe the OPC UA server (endpoints, namespaces) | | plc_comms_opcua_browse | Browse the address space (read-only) | | plc_comms_opcua_tag_list | Recursive Tags-namespace listing (read-only) | | plc_comms_opcua_read | Read nodes by node-id/tag path (read-only) | | plc_comms_opcua_write | Write nodes — allowlist-gated |

Allowlist

Writes (cip_tag_write, opcua_write) are gated by the same operator-managed download allowlist as project downloads. The canonical file lives in sylo-logicforge at packages/sylo-logicforge/assets/download-allowlist.json (this package's loader resolves it across the monorepo); env override: LOGICFORGE_DOWNLOAD_ALLOWLIST.

Python

ciplogix installs on demand from vendor/ciplogix/*.whl (committed); asyncua pip-installs on demand (see scripts/requirements.txt). Runs on the same SYLO_PYTHON as the other controls packages — no SDK Python needed.