Sharp DP-750 Wartungshandbuch PDF herunterladen (Seite 108)

108 • Glossary

WAGO-I/O-SYSTEM 750

PROFIBUS

6 Glossary

Bit

Smallest information unit. Its value can either be 1 or 0.

Bit rate

Number of bits transmitted within a time unit.

Bus

Line for bit serial or bit parallel, clocked data transfer. A bus for the bit

parallel data transmission comprises of address, data, control and supply bus.

The width of the data bus (8-,16-, 32-, 64 bit) and its clock speed is decisive

for the speed at which data can be transferred. The address bus width limits

the possible architecture of a network.

Byte

Binary Yoked Transfer Element. A data element greater than one bit and

smaller than a word. Generally a byte contains 8 bits. With a 36 bit computer a

byte may contain 9 bits.

Bootstrap

Operating mode of the Fieldbus Coupler /Controller (750-333 and 750-833) in

which the device awaits a firmware upload.

Data bus

see Bus.

Fieldbus

System for serial information transmission between devices in automation

technology in field areas close to the process.

Fieldbus variable

[PFC variable]

Process data from the user program of the fieldbus controller.

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Sharp DP-750 Wartungshandbuch Seite 108