Advantech External DI, DO, AI, AO Wiring Reference, Requirements for RS-485 signal wires

Appendix E

FAN (Outflowing)

ADAM 5000/485

T/B

Relay

Figure E-2: External Terminal Block and Fan

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

ØThe 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.

ØWithin an environment that is subject to multiple interferences, it is

advised that a higher voltage level, e.g. a voltage above 12 VDC, should be used to ward off possible interferences.

ØThe 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

ØUse 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.

ØTwisted -pair wire compliant with EIA-422 or EIA-485 standards, which contains 24AWG thin copper conductor with copper mesh and aluminum foil for shielding.

ADAM-5000 E-3