6
2.4.3
CHECKING COMMUNICATION WITH THE RTUs
The fifth screen to the right in the subject of "CURRENT STATUS" shows the quality of
communication with each of the 2W RTUs. An RTU with communication problem will be
underlined.
3.
THE VARIOUS TYPES OF RTU UNITS
There are two kinds of RTU units for the 2 wired single cable system, there are modular RTUs
and compact RTUs. The following paragraphs describe both types.
3.1
MODULAR RTUS
The modular RTUs can handle up to 8 outputs and 8
digital inputs. The outputs are built of "plug in" modules
with 2
outputs each, there can be up to 4 modules per
RTU, therefore the units may come with 0, 2, 4 6 or 8
outputs.
The digital inputs are built of "plug in" modules of 4 inputs,
there can be up to 2 modules per RTU, and therefore we
may have RTUs with 0, 4 or 8 digital inputs.
The address of the 2W RTU
interface
There are 17 RTUs. No
16,17 not responding
The sound of the buzzer
of the RTUs can be
turned ON or OFF.
Activates a counter of communication
errors per each RTU
Reset
button
Address
switches
SW4 - I/O
selection
for test
SW3-Test
triggering
4 digital
input
module
2 outputs
module
Socket of
outputs
module
The 2 wired line
connection point
To be
grounded
4 inputs
"plug in"
module
2 outputs
"plug in"
module
Socket of
Inputs
module
Sockets of
Inputs
module
Sockets of
outputs
module
