Instruction Manual

Warning: Óç
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.
Note:
Maximum wire size termination and
torque rating:
• 0.0507 to 3.30 mm
2
(30 to 12
AWG) single-wire termination or
two 1.31 mm
2
(16 AWG)
• 0.8 Nm (7.0 lb.-in.) torque
Note:
Adjacent terminals may be labeled
differently, depending on the model
number.
Note:
To prevent damage to the control-
ler, do not connect wires to unused
terminals.
Note:
Maintain electrical isolation be-
tween Analog Input 1, Digital I/O,
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.
Watlow EZ-ZONE
®
PM Limit Controller • 26 • Chapter 2 Install and Wire
Standard Bus EIA-485 Communications
Standard Bus
EIA-485
T-/R-
common
98
99
CF
CD
CE
B5
D6
D5
Slot C
T+/R+
• 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
PM _ _ _ _ _-[A, 2 or 3] _ _ _ AAA
Note:
DonotleaveaUSBtoEIA-485converterconnectedtoStandardBuswith-
out power (i.e., disconnecting the USB end from the computer while leaving
theconverterconnectedonStandardBus).DisturbanceontheStandard
Bus may occur.
Modbus RTU or Standard Bus EIA-485 Communications
Modbus RTU or
Standard Bus EIA-485
T-/R-
common
98
99
CC
CA
CB
B5
D6
D5
Slot C
T+/R+
• 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 PM controllers on a
Standard Bus network.
• MaximumnumberofEZ-ZONE
controllers on a Modbus RTU
network is 247.
• Maximumnetworklength:
1,200meters(4,000feet)
• 1/8thunitloadonEIA-485bus.
PM _ _ _ _ _-[1] _ _ _ AAA
Note:
DonotleaveaUSBtoEIA-485converterconnectedtoStandardBuswith-
out power (i.e., disconnecting the USB end from the computer while leaving
theconverterconnectedonStandardBus).DisturbanceontheStandard
Bus may occur.