## TROUBLESHOOTING – MATHEMATICAL SLC 500 PLC OVERFLOW

Automatización y control

Mathematical overflow PLC SLC 500 5/05 processor

Cliente: Mining

Fecha: 2014

Lugar: Chile

Developing the maintenance control system, which make PLC SLC500, CompactLogix and ControlLogix, PLC failure occurs with 5/05 SLC500 which enters Fault for “Math Overflow Trap S: 5/0”, after an comprehensive analysis all the program search zero arithmetic result, it is detected that the signal scaling from a nuclear gauge which enters formula to calculate the percentage of solid was with mathematical overflow. Resolved modifying signal scaling and checking analog input signal to rule out problems.