A superconducting cryogenic system has been designed and deployed in Beijing Electron-Positron Collider Upgrade Project (BEPCII). The system consists of a Siemens PLC (S7-PLC) for the compressor control, an Allen Bradley (AB) PLC for the cryogenic equipments, and the Experimental Physics and Industrial Control System (EPICS) that integrates the PLCs. The system fully automates the superconducting cryogenic control with process control, PID control loops, real-time data access and data restore, alarm handler and human machine interface. This paper describes the BEPCII cryogenic control system, data communication between S7-PLC and EPICS Input/Output Controllers (IOCs), and the integration of the flow control, the low level interlock, the AB-PLC, and EPICS.