Basics Of S7-400
Above Picture is basically of CPU41x-1. In this one port X1 is present and accordingly LEDs are present. X1 port is of MPI/DP. Near to MPI/DP serial number of CPU is present which in further helps in getting manufacturing data. Mode selector switch is used to change CPU mode manually. We can make it either RUN/Stop/MRES. LED indications help in determine the status of CPU, fault diagnosis at glance. Details diagnosis can be done through CPU Module information option available in PG step 7. Memory card slot is used to insert memory card of two type: a. FLASH card. b. RAM card. External Battery connector is used to supply voltage to CPU through external supply range from 5 V-15 V in case of change of power card. This is used to maintain the program in the RAM and also to maintain values at counter, timer etc. It requires 2.5 mm Jack and to check the polarity as shown be...