![]() ![]() Its role is to link today’s operator stations processing modules, and gateways. LOCAL CONTROL NETWORK (LCN): The Local Control Network is backbone of most TDC 3000 systems. * Requirements for process control & Process Network * For continuous/discrete control strategy * Supervisory Network * For Human machine interface *Plant Information Network *For Management Information systems. CONSIDERABLE REDUCTION OVER MAINTENANCE EFFORTS (THROUGH BULT-IN DIAGNOSTICS). MORE UNIFORM OPERATIONS AND TIGHTER CONTROLS. PHYSICALLY AND FUNCTIONALLY SEPERATED MODULES. BENEFITS OF DCS OVER CONVENTOINAL C & I EQUIPMENT : 1. COMMUNICATION BETWEEN ALL MODULES FAST AND ERROR FREE DATA FLOW 9.GATE WAYS TO VARIOUS PLCS, COMPUTERS SPECIAL PURPOSE CONTROLLORES OTHER SYSTEMS ETC. I/O MONITORING, SEQUENCIAL AND LOGIC CONTROL 8. 5.SYSTEM DATA STORAGE, HISTORICAL DATA STORAGE, SPECIAL EVENTS STORAGE 6. ALARM DISPLAYS AND SELF DIAGONSTIC DISPLAYS (EASE OF MAINTENANCE). SYSTEM CONFIGURATION AND ENGINEERING FUNCTIONS 4. REDUNDANCY (BACK UP )AVAILABLE FEATURES OF DCS: 1. DOES NOT AFFECT THE WHOLE SYSTEM SYSTEM/PROCESS IN CASE OF FAILURES 3. ADVANTAGES OF DCS OVER MICROPRPCESSOR BASED SYSTEM: 1. DCS SYSTEMS ARE SUPERIOR IN COMMUNICATION REDUNDANCY AND DATA SECURITY AND AVAILABILITY OF ALGORITHMS DISTINGUISHES THE DCS FROM PLC. INTRODUCTION DISTRIBUTED CONTROL SYSTEM: A CONTROL SYSTEM WHICH IS FUNCTIONALLY AS WELL AS PHYSICALLY DISTRIBUTED IS CALLED A DCS. ![]()
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