Advantech RS-485 Manual de usuario descargar pdf (Pagina 329)

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101

ADAM-5000 E-3

Appendix E

Figure E-2: External Terminal Block and Fan

E.3 External DI, DO, AI, AO Wiring Reference

Ø The common end of some D.I. and D.O. modules is connected with

the GND of ADAM-5000/4000 system. Therefore, the common end

of external DI and DO signal wiring should not be grounded with

those on-site machineries.

Ø Within an environment that is subject to multiple interferences, it is

advised that a higher voltage level, e.g. a voltage above 12 V

should be used to ward off possible interferences.

Ø The signal wire for AI and AO must be of a shielded type, i.e. with

surrounding copper mesh and aluminum foil for proper shielding.

For the specification of the signal wires, please refer to User’s

Manual.

E.4 Requirements for RS-485 signal wires

Ø Use RS-485 twisted-pair as signal wire. The quality of signal

transmission can be improved in proportion with the number of

twists per foot of the wire. If the wire has more twists per foot, the

signal quality could be better.

Ø Twisted -pair wire compliant with EIA-422 or EIA-485 standards,

which contains 24AWG thin copper conductor with copper mesh

and aluminum foil for shielding.

Relay

T/B

ADAM 5000/485

FAN (Outflowing)

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Advantech RS-485 Manual de usuario Pagina 329

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