Watlow Electric Integrated Controller User Manual Rev C EZ-ZONE PM - Manual (Page 24)

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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 elec-
trical sensors or peripheral
devices. Failure to do so may
result in damage to equip-
ment and property, and/or
injury or loss of life.
Note:
Maximum wire size termina-
tion 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, depend-
ing on the model number.
Note:
To prevent damage to the
controller, do not connect
wires to unused terminals.
Note:
Maintain electrical isolation
between analog input 1, digi-
tal input-outputs, switched
dc/open collector outputs and
process outputs to prevent
ground loops.
Note:
The control output common
terminal and the digital com-
mon terminal are referenced
to different voltages and
must remain isolated.
Wa t l o w E Z - Z O N E ® P M I n t e g r a t e d C o n t r o l l e r • 2 2 • C h a p t e r 2 I n s t a l l a n d W i r e
Standard Bus EIA-485 Communications
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
PM6 _ _ _ _-(A, 2 or 3) _ _ _ A _ _
Modbus RTU or Standard Bus EIA-485 Communications
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 ® 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 _ _
EIA-232/485 Modbus RTU Communications
485 common
485 T+/R+
CB
CA
CC
CB
CA
C5
C3
C2
Slot B
485 T-/R-
485 T+/R+
485 T-/R-
232 common
232 (TX) to DB9 pin 2 (RD)
232 (RD) to DB9 pin 3 (TX)
• 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 _ _ _ _-2 AAA A _ _
Modbus-IDA
Terminal
EIA/TIA-485
Name
Watlow Termi-
nal Label
Function
DO A CA or CD T-/R-
D1 B CB or CE T+/R+
common common CC or CF common
Note:
Avoid continuous writes
within loops. Excessive
writes to EEPROM will cause
premature EEPROM failure.
The EEPROM is rated for
1,000,000 writes.