Ó

Standard Bus EIA-485 Communications

Warning:

Use National Electric (NEC) or other country-specific standard wiring and safety practices when wiring and connecting this controller to a power source and to electrical sensors or peripheral devices. Failure to do so may result in damage to equipment and property, and/or injury or loss of life.

Slot C

98

99

CF common

CD T-/R- CE T+/R+

B5

D6

D5

•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 common to the common terminal of the EIA-485 port.

•Do not route network wires with power wires. Connect net- work wires in daisy-chain fash- ion when connecting multiple devices in a network.

•Do not connect more than 16 EZ-ZONE®PM controllers on a network.

•maximum network length: 1,200 meters (4,000 feet)

•1/8th unit load on EIA-485 bus PM6 _ _ _ _-(A, 2 or 3) _ _ _ A _ _

Modbus RTU or Standard Bus EIA-485 Communications

Note:

Maximum wire size termination and torque rating:

•0.0507 to 3.30 mm2 (30 to

12 AWG) single-wire termi- nation or two 1.31 mm2 (16 AWG)

•0.8 Nm (7.0 lb.-in.) torque

Note:

Adjacent terminals may be labeled differently, depending on the model number.

Note:

Slot C

98

99

CC common

CA T-/R- CB T+/R+

B5

D6

D5

•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 common to the common terminal of the EIA-485 port.

•Do not route network wires with power wires. Connect net- work wires in daisy-chain fash- ion when connecting multiple devices in a network.

•A termination resistor may be required. Place a 120 Ω resistor across T+/R+ and T-/R- of last controller on network.

•Only one protocol per port is available at a time: either Mod- bus RTU or Standard Bus.

•Do not connect more than 16 EZ-ZONE®controllers on a Standard Bus network.

•Maximum number of EZ- ZONE® controllers on a Modbus network is 247.

•maximum network length: 1,200 meters (4,000 feet)

•1/8th unit load on EIA-485 bus. PM6 _ _ _ _-1_ _ _ A _ _

To prevent damage to the controller, do not connect

EIA-232/485 Modbus RTU Communications

wires to unused terminals.

Note:

Maintain electrical isolation between analog input 1, digital input-outputs, switched dc/open collector outputs and process outputs to prevent ground loops.

Note:

The control output common terminal and the digital common terminal are referenced to different voltages and must remain isolated.

Note:

Avoid continuous writes within loops. Excessive

Slot B

485 T+/R+ CB

485 T-/R- CA

485 common CC

485 T+/R+

CB

485 T-/R- CA

232 common C5

232 (TX) to DB9 pin 2 (RD)

C3

232 (RD) to DB9 pin 3 (TX) C2

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

•Wire T+/R+ to the B termi- nal of the EIA-485 port.

•Wire common to the com- mon terminal of the EIA- 485 port.

•Do not route network wires with power wires. Connect network wires in daisy- chain fashion when connect- ing multiple devices in a network.

•A termination resistor may be required. Place a 120 Ω resistor across T+/R+ and T-/R- of last controller on network.

•Do not wire to both the EIA- 485 and the EIA-232 pins at the same time.

•Two EIA-485 terminals of T/R are provided to assist in daisy-chain wiring.

•Do not connect more than one EZ-ZONE®PM control- ler on an EIA-232 network.

•Do not connect more than 16 EZ-ZONE®controllers on a Standard Bus EIA-485 network.

•Maximum number of EZ- ZONE® controllers on a Modbus network is 247.

•maximum EIA-232 network length: 15 meters (50 feet)

•maximum EIA-485 network length: 1,200 meters (4,000 feet)

•1/8th unit load on EIA-485 bus.

PM6 _ _ _ _-2AAA A _ _

writes to EEPROM will cause premature EEPROM failure. The EEPROM is rated for 1,000,000 writes.

Modbus-IDA EIA/TIA-485

Watlow Termi-

Function

Terminal

Name

nal Label

 

DO

A

CA or CD

T-/R-

 

 

 

 

D1

B

CB or CE

T+/R+

 

 

 

 

common

common

CC or CF

common

Watlow EZ-ZONE®PM Integrated Controller

• 22 •

Chapter 2 Install and Wire