LN Series Free Programmable LN-PRGxxx-12 Controllers Installation Instructions 11
Voltage Outputs
Connect the 0 to 10 VDC as shown in Figure 29.
If you are controlling an analog actuator, connect the 0
to 10 VDC output, along with an external 24 VAC
power source, to the analog actuator (Figure 30).
Communications Wiring
The recommended cable type for LONWORKS®
communications is 22 AWG (0.65 mm), twisted pair,
unshielded wire. The L
ONWORKS communication wire
is polarity insensitive and can be laid out in a bus, star,
or free topology. For loop topology, take special care to
maintain the polarity when connecting the L
ONWORKS
network to avoid a short circuit.
Note: We recommend you use the bus topology
network configuration for all L
ONWORKS
communication wiring. This configuration allows you to
troubleshoot the network easily.
Connect both wires to the LON1 or LON2 terminals of
the controller. When you insert multiple wires into the
terminals, ensure you properly twist the wires together
prior to inserting them into the terminal connectors.
For information and detailed explanations on network
topology and wire length restrictions, refer to the
L
ONWORKS LN-Series Network Communication and
Interface Guide Technical Bulletin (LIT-12011253).
You can also refer to the Echelon® Junction Box and
Wiring Guideline for Twisted Pair L
ONWORKS Networks
(Part No. 005-0023-01).
Selecting Network Terminators
Two network terminators are required for the bus
topology network configuration. Place one network
terminator at each end of the bus topology channel.
One network terminator is required for the free
topology network configuration. You can put the
network terminator anywhere on the channel.
When used with an LN Series Communicating Sensor,
the network can be accessed at the sensor’s audio
plug port when the two Net to Subnet Port Settings
jumpers inside the LN-PRG Series controller are set to
Enable (for jumper location, see Configuration Jumper
Location and Identification). This connects the main
L
ONWORKS network to the LN-SVSENx-0 subnetwork
Cat 5e cable to create a free topology L
ONWORKS
network with maximum allowable total length of all
segments combined to be no more than 1,600 feet
(500 meters). The Cat 5e cable length may also be
restricted by the maximum allowable subnetwork bus
length.
This setup mixes the cable gauge used for the network,
which under rare conditions my cause communication
problems. To help avoid these problems, carefully test
for good communication on the entire network. If there
are any network problems, see Troubleshooting
.
Figure 29: Voltage 0 to 10 VDC Universal Output
Figure 30: Voltage 0 to 10 VDC Universal
Output - Analog Actuator
Figure 31: Communications Wiring
IMPORTANT: Use the proper network terminators
for the network topology. Failure to use the correct
network terminators may result in communication
errors between controllers. Do not use multiple
gauges of cable on the same communication bus.
Figure 32: LONWORKS Network Free
Topology
Controller
LN-Series Sensor
22AWG (0.65mm)
Unshielded Twisted Pair Network Cable
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