International Gas Detectors TOC-635, Installer'S Manual

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DETECTOR NODE CONCEPTS
Detector Node Module
Pellistor Flammable Gas Detector Port Active
This is the first or ‘Base’ address for the module
Toxic Gas Detector Port Active
This is the next sequential address
after the pellistor
24V DC Sounder Output
I/O Port 2 Active
Relay Output Active
24V DC Beacon Output
I/O Port 1 Active
Base
Address 5
Internal to each detector is a detector node module PCB (see illustration). This is common to both ATEX and
safe area detectors. The module is a common connection point onto the system for gas detectors and also
other inputs and outputs.
The default setup for a detector node is indicated as follows.
Note the module lets you have a Toxic and Flammable gas detector running at the same time. You can also
operate a beacon sounder from the module so long as its operating current at 24V DC is less than 100mA. In
addition there is a relay output that can be used.
Addressing the module differs from older 4-wire systems. By setting one ‘base’ address you set all other
addresses on the module. The example above shows base address 5. Module addresses in this case would be:
Inputs to the Module:
Pellistor
Toxic
Outputs From the Module
I/O Port 1 (Beacon)
I/O Port 2 (Sounder)
Relay
Address
5
6
105
106
107
Note:
Detector Addresses now run from 1 to 99
Outputs start 100 on from the set base address.
Output addresses are from 101 to 199
So addresses do not overlap the next logical base
address in this example would be 8, so the addresses
on the next module would be:
Pellistor address:
Toxic address:
I/O Port 1 address:
I/O Port 2 address:
Relay address:
8
9
108
109
110
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