Logic device, configurable

Correct folder/directory structure created and files installed within folders/directories Software configuration completed satisfactorily Site and system identification User access groups Security configuration Menu/display access configuration Logical device connections Inspection of critical hardware components Servers in correct locations Processor speed Cache size ROM bios Memory capacity Peripherals Storage devices Input devices... 

User access groups - Security configuration - Menu/display access configuration - Logical device connections Input/output - Outstation connection and configuration - Field device connection and cali-... 

Seminario JM, Yan L (2005) Molecular logical devices in cascade configuration with information encoded as electrostic potentials. J Am Chem Soc vol. Submitted... 

The process and instrumentation (P I) diagram provides a graphical representation of the control configuration for the process. The P I diagrams illustrate the measurement devices that provide inputs to the control strategy, the actuators that will implement the results of the control calculations, and the function blocks that provide the control logic. 

Many batch software packages also recognize process states. A configuration tool is provided to define a process state. With such a mechanism, the batch logic does not need to drive individual devices but can simply command that the desired process state be achieved. The system software then drives the discrete devices to the device states required for the target process state. This normally includes the following ... 

Figure 8-62 depicts a hypothetical distributed control system. A number of different unit configurations are illustrated. This system consists of many commonly used DCS components, including multiplexers (MUXs), single/multiple-loop controllers, programmable logic controllers (PLCs), and smart devices. A typical system includes the following elements as well ... 

Diversity can be used to further advantage in redundant configurations. Where redundant measurement devices are required, different technology can be used for each. Where redundant logic is required, one can be programmed and one hard-wired. 

Process control and safety shutdowns must be provided during all modes of operation, not only in the RUN mode. Other modes will require a BPCS configured for the mode operating algorithm and very likely a different set of safety interlocks must provide appropriate protection. Hardwire devices, like timers or software logic, can be used to actuate the SIS pertinent to the operating mode. 

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