Case Study · PLC + SQL
SQL Data Logging
High-frequency PLC data logging into SQL with query APIs for downstream analytics.
100 ms
Log resolution
3+ years
History retained
<200 ms
Query latency
99.9%
Uptime
The Problem
What the plant was facing
Process engineers needed high-resolution historical data for troubleshooting, but existing HMIs only kept a few days of trends locally. Getting a specific timestamp's process values meant coordinating a plant visit.
Our Solution
What we engineered
- Configured PLC-to-SQL logging with millisecond timestamps for critical tags
- Optimised schema with partitioned tables for multi-year retention
- REST endpoints for downstream analytics and reporting tools
- Automatic archival and health checks on the logging pipeline
Tech Stack
Hardware & software used
Siemens/Delta PLC
SQL Server
REST API layer
Data retention jobs
Gallery
On-site & control room
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