6ES7351-1AH01-0AE0 FM351 定位功能模塊SIMATIC S7-300, COUNTER MODULEFM 350-1 FOR S7-300,COUNTER FUNCTIONS UP TO 500 KHZ1 CHANNEL FOR CONNECTION OF5V AND 24V INCREMENTAL ENCODERSISOCHRON MODE,MEASUREMENT MODEINCL. CONFIG. PACKAGE ON CD