The above is the start-up sequence

The above is the start-up sequence of the coal preparation plant when it is selected for coking coal. The stop sequence is just the opposite of the start-up sequence, and the stop shall be conducted along the coal flow. There is also a certain locking relationship between the various equipment. In case of failure, according to the signal fed back to PLC by the failure point, the equipment with the failure equipment reversed to the direction of coal flow shall be stopped to prevent the occurrence of stacking and larger failure. The I / O points of PLC are distributed. In SIMATIC manager, a symbol editor is used to establish the device address table, assign the addresses corresponding to different signals, and make notes for each device to prepare for subsequent programming. The address table (part) of each equipment of heavy medium coal washing control system is shown in Fig. 5-2, FIG. 5-3 and Fig. 5-4