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I have an undocumented program running in a TI 435 (Siemans Simatic TI 435). The program for the machine is turning on a fault light indicating the machine has issues. The language for the PLC is not straight ladder and I am having a difficult time figuring it out. It appears inputs are read into the accumulator worked on spit out into control bits worked on by ladder and then put into the acumulator, worked on and then spit out as outputs. What is the easist way to deciper this? [email protected]