เดฟฟิเนทลี คอร์ปปอเรชั่น จำกัด

Supervisory Control And Data Acquisition (SCADA). An industrial measurement and control system consisting of a central host or master (usually called a master station, master terminal unit or MTU); one or more field data gathering and control units or remotes (usually called remote stations, remote terminal units, or RTU\'s): and a collection of standard and/or custom software used to monitor and control remotely located field data elements. Contemporary SCADA systems exhibit predominantly open-loop control characteristics and utilise predominantly long distance communications, although some elements of closed-loop control and/or short distance communications may also be present.

คำตอบ : What is PLC?

PLC is actually an industrial microcontroller system (in more recent times we meet processors instead of microcontrollers) where you have hardware and software specifically adapted to industrial environment. Block schema with typical components which PLC consists of is found in the following picture. Special attention needs to be given to input and output, because in these blocks you find protection needed in isolating a CPU blocks from damaging influences that industrial environment can bring to a CPU via input lines. Program unit is usually a computer used for writing a program (often in ladder diagram).

คำตอบ : What is DCS?
Distributed control systems (DCS) are used in industrial and civil engineering applications to monitor and control distributed equipment with remote human intervention.

คำตอบ : OLE for process control (OPC)
OPC (OLE for Process Control) is the standard communication interface that enables the data exchange between client applications (HMI/SCADA, RDBM, control/command) and industrial devices (PLC, I/O blocks, drives, etc). OPC is built using the Microsoft’s technologies: OLE, COM and DCOM (Distributed COM) that are well-tested and proven foundation.

คำตอบ : What is Datalogger?
Data logger is the general term given to the device that depend on electronic sensors to monitor and record data (such as temperature, relative humidity [RH], and light).