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Instrumentation control engineering formulas used in industrial control systems and field instruments like 4-20mA and 3-15 PSI conversions.

How to do 4-20mA Conversions Easily

S Bharadwaj Reddy
Generally it is possible to generate a “custom” linear equation in the form of y = mx + b for any linear responding instrument relating input directly to output, a more general...

Example of 3-15 psi to 4-20mA Conversion

S Bharadwaj Reddy
A current-to-pressure transducer is  used  to  convert  a  4-20 mA  electronic  signal  into  a  3-15 PSI pneumatic signal. This particular transducer is configured  for  reverse action instead  of direct, meaning...

PLC Raw Count Calculation for Pressure Transmitter

S Bharadwaj Reddy
Every instrument has at least one input and at least one output. For instruments responding linearly, the correspondence between input and output is proportional: PLC Raw Count Calculation A practical...

4-20mA Formulas and Examples

S Bharadwaj Reddy
4-20 mA transmitter current output can be converted to the voltage within a specified range, from 0 to a maximal amplitude Vmax, as shown in the following picture: 4-20mA Formulas  Calling I...

PLC Analog Input Conversion Formula

S Bharadwaj Reddy
For any unit conversion on any PLC, you can use four function math with the following for PLC Analog Input Conversion Formula, which assumes integer math, as follows : PLC...

PLC Problems Troubleshooting

S Bharadwaj Reddy
Troubleshooting PLCs can be started by checking the healthiness status of CPU, I/O Modules, Fuse Blow-out and different PLC Failure reasons including wiring, field transmitters healthiness status or transmitter configuration,...

PLC Analog Input Scaling

S Bharadwaj Reddy
An Allen-Bradley SLC500 programmable logic controller (PLC) uses a 16-bit analog-to-digital converter ( in its model 1746-NI4 ) in analog input card to convert 4-20 mA signals into digital number...

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