Det-Tronics EQP Fire and Gas Detection/Releasing System - Manual (Page 76)

3-57 14.1 95-8533
SYSTEM CONFIGURATION
SETTING DEvICE NETWORK ADDRESSES
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 communication module will ignore the
switch setting.
Duplicated addresses are not automatically detected.
Modules given the same address will use the number
given and report to the controller using that address.
A "Rogue Device" message will be displayed when
two LON devices have duplicate addresses assigned
to them. 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 for field devices is
done by setting rocker switches on an 8 switch “DIP
Switch” within each device’s housing.
NOTE
Only the first eight of the 12 switches are used
for selecting the device address.
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
3-71) The device’s LON address is equal to the
added value of all closed rocker switches. All “Open”
switches are ignored.
NOTE
The address switches in the DCIO module and
relay module appear slightly different than those
in other devices. Refer to Figure 3-72.
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 on the “Address Identification
Chart” provided with this manual. Post the chart in a
convenient location near the Controller for future
reference.
TYPICAL APPLICATIONS
Figure 3-73 is a simplified drawing of a typical EQP
system. This system includes an EQP Controller,
DCIO and various LON field devices.
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 3-72—Address Switch for DCIO and Relay Module
1 2 3 4 5 6 7 8 1 2 3 4
1 2 4 8 16 32 64 128
OPEN OPEN
LEAVE IN
OPEN POSITION
NODE ADDRESS EQUALS THE ADDED VALUE
OF ALL CLOSED ROCKER SWITCHES
A1557
BINARY
VALUE
CLOSED = ON
OPEN = OFF
Figure 3-71—Field Device Address Switches for
ARM, SAM, DCU and IDC