PLC Automation System - KRS INDUSTRIAL CONTROL SYSTEM CO., LTD

About the project

Date: 2025
Client: Starch Processing Plant
Category: Automation & PLC, Electrical & Control Panel
Address: Nakhon Ratchasima, Thailand

Project Information The PLC Automation System project replaced manual and relay based control with a modern programmable controller platform built on Siemens SIMATIC S7-1200 and S7-1500 with distributed ET 200SP remote I/O. Bringing the machine logic into a structured PLC program makes the plant easier to operate, easier to diagnose and far easier to modify when production requirements change. Our scope covered control panel design and fabrication, PROFINET network layout, PLC and HMI programming in TIA Portal, motor and valve control blocks, safety and interlock logic, complete I/O checking, and commissioning with operator training and full as-built documentation.

Benefits of Project

Consistent and repeatable machine operation
Fast fault location through diagnostics and alarm history
Wiring simplified by distributed I/O close to the equipment
Logic changes possible without rewiring the panel
A platform with long term spare part and support availability

Technologies We Used

Siemens SIMATIC S7-1200 and S7-1500 controllers
ET 200SP distributed I/O stations
PROFINET network with managed switches
TIA Portal programming and version control
WinCC HMI with alarm and trend functions
Motor, valve and analog control function blocks
Safety relay and interlock circuits

From Relay Logic to a Structured Program

Replacing relay and hard wired control with a structured PLC program turns the machine logic into something that can be read, tested and changed. Every motor and valve uses the same function block, so behaviour is identical across the plant and a modification made once is correct everywhere it is used.

Distributed I/O Where the Equipment Is

ET 200SP stations sit next to the equipment they serve, so field cables run metres instead of hundreds of metres back to a central panel. PROFINET carries the signals and the diagnostics together, which means a broken sensor reports itself by name instead of appearing as a dead input on a terminal strip.