Outlet loop control device for preventing PLC (Programmable Logic Controller) crash of continuous annealing temper mill

The embodiment of the utility model provides an outlet loop control device for preventing a PLC (Programmable Logic Controller) of a continuous annealing temper mill from crashing. The outlet loop control device comprises a remote station, a TM31 module, an analog quantity input module and a control unit, a network port of the TM31 module is connected with a network port of the control unit through a network cable; an analog quantity channel of the TM31 module is connected with an analog quantity channel of the analog quantity input module through a signal line; and the analog quantity input module is connected with a reserved expansion interface of the remote station. The speed value of the 7 # tension roller can still be normally collected when a TDC PLC control system crashes or communication between the TDC and an outlet S7-400 PLC is interrupted, so that the speed of an outlet loop is accurately calculated, and the phenomena that the loop is broken and the furnace is broken more seriously are avoided. 本实