Programmable logic controller (PLC) automatic deviation correction system for linkage control on two electromagnetic lifters

The utility model provides a programmable logic controller (PLC) automatic deviation correction system for linkage control on two electromagnetic lifters, which comprises respective PLC controllers of the two electromagnetic lifters; carts of the two electromagnetic lifters are respectively provided with a laser range finder between the carts; trolleys of the two electromagnetic lifters are respectively provided with a laser range finder between the trolleys; main lifting hooks of the two electromagnetic lifters are respectively provided with a lifting beam height laser range finder; the outputs of all the laser range finders of each electromagnetic lifter are connected to the respective PLC controllers; the outputs of the PLC controllers of the two electromagnetic lifters are connected with respective excitation relay control circuits through a digital/analogue (D/A) conversion circuit; the outputs of the PLC controllers of the two electromagnetic lifters are connected with respective transmitting and receiving modules; and distance control modules between the carts, distance control modules between the trolleys, two-cart/trolley height deviation coordination modules and synchronic distance confirmation modules are respectively arranged in the PLC controllers of the two electromagnetic lifters.