LN Application Specific, Remote I/O, and Free Programmable Controllers Installation Instructions
10
Connect both wires to the LON terminals (LON1 and LON2) of the controller (Figure 17). When you insert multiple
wires into the terminals, ensure you properly twist the wires together before you insert them into the terminal
connectors.
For more information and detailed explanations on network topology and wire length restrictions, refer to the
L
ON
W
ORKS
LN-Series Network Communication and Interface Guide Technical Bulletin (LIT-12011253)
or Echelon
Corporation’s
Junction Box and Wiring Guideline for Twisted Pair L
ON
W
ORKS
® Networks.
LN Sensor Wiring
The controllers in this document are compatible with the LN Sensor line of standard room sensors. Refer to the
LN
Series Sensor Installation Instructions (LIT-1201871)
for wiring details.
Memory Erase Jumper
Each Application Specific Controller and Remote I/O Module features a memory erase jumper. Use the memory
erase jumper to erase the Neuron chip's memory. If an incorrect APB or NXE file is loaded into the device, the
Neuron chip's memory is corrupted and you cannot communicate with the device. Use the memory erase jumper to
correct this problem by resetting the Neuron chip's memory; the chip is then in an application-less state.
The memory erase jumper is labeled J2 on the Application Specific Controllers (Figure 19), J4 on the LN-IO301-1
Remote I/O Module (Figure 20), and J20 on the LN-IO401-1 and LN-IO520-1 Remote I/O Modules (Figure 18).
To erase the Neuron chip's memory using the memory erase jumper, do the following:
1.
Disconnect the power to the device.
2.
Place a jumper on the proper pins on the controller or module.
3.
Reconnect the power to the device.
Note:
The orange colored service LED blinks rapidly indicating that it is erasing the Neuron chip’s memory. When
the service LED stops blinking and remains solid, the erase procedure is complete.
Note:
The erase procedure normally takes between 2 and 10 seconds to complete.
4.
Disconnect the power to the device and remove the jumper.
5.
Reconnect the power. The service LED blinks twice and becomes solid indicating the controller or module is
application-less.
6.
Download the correct APB file.
IMPORTANT:
Use the proper network terminators for the network topology. Failure to use the correct network
terminators may result in communication errors between units. Do not use multiple gauges of cable on the same
communication bus.
Figure 17: Communications Wiring