The DCCS operator station

A number of the basic characteristics of operator stations (OS) are described in Section 7.19.4. Distributed computer control systems normally offer two types of operator station, a stand-alone OS, and a host-dependent OS. Both provide a logical display hierarchy which, if properly configured, improve significantly the 

CON Concentrator. OS Operator station. CM Control module. PLC Programmable controller. DM Data acquisition module. HC Hiway controller. 

Some typical data highway configurations (a) multidrop DH (b) partially clustered/multidrop DH (c) star configuration (d) ring DH 

In addition to the above, a number of on-line and off-line diagnostic displays are provided in order to locate system failures promptly and to enable faulty components to be repaired. Most operator stations offer facilities which allow graphic and mimic displays to be built. 

All the displays described above can be implemented on the host s operator station. However, the latter must not be used as the primary operator interface. 

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