13
95-8549
8.3
SETTING DEVICE NETWORK ADDRESSES
(EQ and EQP Models 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 zero 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 15 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 16) 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 15—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 16—Address Switches for X2200
