Watlow EZ-ZONE RMA Modul Bedienungsanleitung PDF herunterladen (Seite 19)

Watlow EZ-ZONE

RM A M odule • 16 • Chapter 2 Install and Wire

Profibus DP Communications

485 T-/R-

+5Vdc Voltage Potential

trB

trA

Slot E

485 T+/R+

Digital ground

Termination resistor B

485 T+/R+

485 T-/R-

Termination resistor A

• Wire T-/R- to the A terminal of the EIA-485 port.

• Wire T+/R+ to the B terminal of the EIA-485

port.

• Wire Digital Ground to the common terminal of

the EIA-485 port.

• Do not route network wires with power wires.

Connect network wires in daisy-chain fashion

when connecting multiple devices in a network.

• A termination resistor should be used if this con-

trol is the last one on the network.

• If using a 150 Ω cable Wat low provides internal

termination. Place a jumper across pins trB and

B and trA and A.

• If external termination is to be used with a 150

Ω cable place a 390 Ω resistor across pins VP

and B, a 220 Ω resistor across pins B and A, and

lastly, place a 390 Ω resistor across pins DG and

• Do not connect more than 16 EZ-ZONE

RM mod-

ules on any given segment.

• Maximum EIA-485 network length: 1,200 meters

(4,000 feet)

• 1/8th unit load on EIA-485 bus.

• Communications instance 2

RMAX - A [6] X X - A A X X

Profibus Terminal EIA/TIA-485 Name Watlow Terminal Label Function

VP (Voltage Potential) - - - - VP +5Vdc

B-Line B B T+/R+

A-Line A A T-/R-

DP-GND common DG common

RMA Part # Digit 5 and 6 is A6

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 78 79

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