ABB SPA-ZC 400 Spezifikationen PDF herunterladen (Seite 11)

Before computer aid in process control was developed and affordable, many control rooms

consisted of a control table hardwired to all the adjustable devices in the process and a

large screen from were alarms and conditions were readable and mostly all different

commands had to be sent through its own wire making cabling very expensive.

In recent years, process control has taken a big step forward thanks to computer aid. The

digital age has removed much of the hardwiring previously necessary for sending control

signals (in some cases even all communication wires thanks to wireless technology).

Digital communication gives users the ability to address these commands and send all of

them through one cable, but it requires hardware and software that are able to recognize

these addresses and commands so that they can be applied to the correct device. Protocols

give hardware and software these necessary capabilities to understand the data that is being

sent and received. The new international standards also give devices from different

vendors the ability to cooperate without needing special modifications.

IEDs and their advanced and extensive functionality have given the ability to create more

reliable stations as more functions can be added without a huge expense to customers.

Many of these devices also support PLC logics so that special requirements and functions

that are station-specific can easily be added.

SCADA systems are used for supervisory systems for control with humans as operators.

The primary control is not done by SCADA but by intelligent devices and surrounding

control systems. These devices collect process specific data and later on convey this data to

executive control equipment for supervision. (3)

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ABB SPA-ZC 400 Spezifikationen Seite 11