Description: to 4MHz visit to ccc wave input module, the output 500Hz frequency for calls. 1kHz square by the very fen10 frequency module after module mian seconds, the sub-module mina. When module hour, the clock signal; WinCC module used for the entire point timekeeping provide control signals, (When 59 50 ", 52", 54 ", 56", 58 ", q500 output" 1 ", for 00 seconds when qlk output to "1", which signals through two doors or logic to achieve timekeeping function); sel module with a digital control unit elections signal; bbb modules corresponding to the digital signal of the need to send signals show; with paragraph 107 of the decoder for decoding dispa module. 4 MHz will visit wave input module to ccc, output 500 Hz frequency for calls. 1 kHz square wave by fe
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