Requirements and current state
Device model, register map, address, physical link and update needs are assessed together. Connectivity alone does not prove correct interpretation: units, scaling, types and byte/word order need separate checks.
Technical design and development
Modbus polling and timeouts follow device capacity. MQTT information exchange needs defined topics, authentication, access and delivery quality. A web interface does not require exposing the PLC directly to the internet.
Testing and implementation
Outage, wrong address, device restart and stale-data scenarios are tested. Operators can identify data freshness. Network documentation and settings support maintenance; passwords and private plant APIs are not published on the website.