BUS datasheet(26/42 Pages) BURKERT

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Type büS

büS network shielding

11.1

büS NETWORK SHIELDING

Shielding of EDIP devices

Detailed shielding information for each device can be found in pin assignment of technical data sheet and

operating instructions. There are three types of device-internal shieldings:

Direct: Direct connection of shield to FE

Device

(Direct)

büS cable shield

Functional earth (FE)

RC: Parallel connection of resistor and capacitor to

Device

(RC)

büS cable shield

Functional earth (FE)

None: No shield connection

Device

(None)

büS cable shield

Shield end

is floating!

Device has no

functional earth (FE)

to connect!

Tab. 6: büS network shielding

11.2

Comparison of shieldings

Shielding

Reasons for/when using

Restrictions for installation or disadvant-

ages

DIRECT

Connection of

shield to FE

▪ Best shielding effect

▪ Metal housing (e.g. stainless steel for

“clean design”)

Equipotential FE grounding system in

plant is mandatory.

Parallel connection

of resistor and ca-

pacitor to FE

▪ Second best shielding effect

▪ Also practicable when FE quality is

poor

▪ Recommended shielding for safety

applications to prevent compensation

currents

Shielding effect may not be sufficient in

very rough H-field emitting environments.

NONE

No FE on device available (e.g. due to

customer requirement)

To have any shielding effect, cable shield

must always led near by device with no

significant stiches (stubs). The shielding

is carried out on subsequent or adjacent

devices.

Tab. 7: Comparison

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