HL-2A的中央逻辑控制PLC环网设计

Ring Network for PLC Control System on HL-2A

摘要:

PLC逻辑控制是HL-2A中央控制系统的重要组成部分,改造前的逻辑控制系统基本使用硬连接,维护耗时耗力,结合新一代实时工业以太网PROFINET为HL-2A逻辑控制系统的改造设计了环形冗余网络;采用8台西门子交换机SCALANCE X200通过光纤依次连接成环,交换机的电口连接S7-400和上位机,与等离子体放电相关的重要信号仍走硬连接,其他所有信号都走网络传送;中控系统作为管理站对其他7个子系统进行集中化管理,中控可以轻松快速地获取每个子系统的状态,在等离子体放电错误时能很快的预测事故地点和故障分析;根据放电实验结果表明,光纤环网非常适用于设备分散的慢控制系统,整个控制系统逻辑关系清楚,后期扩展和改造也非常方便;改造后的逻辑控制系统能满足HL-2A和HL-2M两套装置的慢控制,维护简便,事故定位快准,提高了放电效率。

Abstract:

PLC logical system is an indispensable part of centre control system on HL-2A Tokamak. It is time-consuming to maintain wiring of logic control system before transformation. A PLC Optical Fiber Ring Network has been designed and introduced to PLC logic control system on HL-2A through the application of a new generation real-time Ethernet PROFINET. Eight switch devices named SCALANCE X202-IRT form a closed loop through the optical fiber plug in 2 BFOC ports, each PLC connect with its switch device with a RJ-45 electrical jack. Important signals related to the discharge still using hard-wiring and all the other signals using network transmission. Within the PLC ring network, Central control makes centralized management for other subsystems so that makes the ability of forecast and accident diagnose disposal more powerful and quickly during plasma discharge failure. The results of discharge experiment show that ring network is well suited for slow control system. It greatly makes the whole control system logic relationship clear and protect the latter research investment. The new Logic control system can satisfy the need of slow control of HL-2A and HL-2M. It makes maintenance more convenient and fault location more accurate and faster. It is greatly improve discharge efficiency. 