The Input Channelproblem of Directly Parallel Connection on Double PLC's ETS
The ETS system is an important main protection for steam turbines,which is related to the safe and stable operation of the tur-bine.This article analyzes the ETS protection system with dual PLC redundancy configuration,proposes the problem of parallel input of switch signals in the dual PLC redundancy system,and analyzes the problems.Several possible problems of input signal missending and signal rejection are proposed,and further solutions are proposed to help improve the ETS protection system.