Det-Tronics X3301 - Setting Device Network Addresses (EQP Model)

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95-8704
2.7
SETTING DEVICE NETWORK ADDRESSES
(EQP Model Only)
Overview of Network Addresses
Each device on the LON must be assigned a
unique address. Addresses 1 to 4 are reserved
for the controller. Valid addresses for field
devices are from 5 to 250.
IMPORTANT
If the address is set to 0 or an address
above 250, the switch setting will be
ignored.
Duplicated addresses are not automatically
detected. Modules given the same address
will use the number given and report to the
controller using that address. The status word
will show the latest update, which could be
from any of the reporting modules using that
address.
Setting Field Device Addresses
Selection of the node address is done by
setting rocker switches on an 8 switch “DIP
Switch Assembly” within the detector’s housing.
Refer to Figure 16 for switch location.
WARNING
The network address switches are located
within the detector housing. Disassembly
of the detector head that contains
powered electrical circuits is required
to gain access to the network address
switches. For hazardous areas, the area
must be de-classified before attempting
disassembly of the device. Always observe
precautions for handling electrostatic
sensitive devices.
The address number is binary encoded with
each switch having a specific binary value with
switch 1 being the LSB (Least Significant Bit),
see Figure 17. The device’s LON address is
equal to the added value of all closed rocker
switches. All “Open” switches are ignored.
Example: for node No. 5, close rocker switches
1 and 3 (binary values 1 + 4); for node No. 25,
close rocker switches 1, 4 and 5 (binary values
1 + 8 + 16).
NOTE
The field device sets the LON address
only when power is applied to the device.
Therefore, it is important to set the switches
before applying power. If an address is
ever changed, system power must be
cycled before the new address will take
effect.
After setting address switches, record the
address number and device type.
ADDRESS SWITCHES SENSOR MODULE
REMOVED FROM HOUSING
A2191
Figure16—Location of Address Switches
1 2 3 4 5 6 7 8
1 2 4 8 16 32 64 128
ON
NODE ADDRESS EQUALS THE ADDED VALUE
OF ALL CLOSED ROCKER SWITCHES
A2190
BINARY
VALUE
CLOSED = ON
OPEN = OFF
Figure17—Address Switches for X3301