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Troubleshooting Sludge collectors at Water treatment plant

Missing some tags on Kepware server in which the operators could not operated or saw the valve status on SCADA screen....

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How to read and troubleshoot analog 4-20mA loop devices .

Here is a part of simplifying of PLC wiring diagram at a water treatment plant (see picture above). There are three transmitters that connect to a PLC  analog current input module and with some reasons, they mysteriously failed to...

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Read Allen Bradley tags using Python 2.7 and pass the values to node-red.

  Read and write  Allen Bradley tag values using  python which utilize Common Industrial Protocol (CIP) on Ethernet/IP. This method will work on Controllogix and Compactlogix PLCs. The script  will be executed in Node-red and the return value will...

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Another “Swiss Army Knife” for PLC Networks : Raspberry Pi 3

We can turn Raspberry pi 3 as  AP(Access point) and can be utilized with wireless devices to scan PLCs or field devices network. Requirements: 1.Raspberry pi 3 2.Power Supply (for Raspberry) 3.Wireless device ( tablet, laptop, or cellphone) 4.Ethernet...

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“Poorman” PLC I/O board

Process or manufacturing plants have PLCs which get signal inputs from mechanical buttons, switches, limit switches and send signal outputs to activate relays, solenoid valves etc.  In many cases, they use 24V DC power supply for PLC CPUs  and...

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Convert legacy control panel into LCD alarm and warning system with Arduino.

In the old days, We used to have electronic controllers or PLCs to send the warnings or alarms on the panel by turning combination of  light indicators  on or off. To understand these signals we have to refer their...

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