6/18
Building Technologies
Central communication unit OZW775 V2.0
CE1N5663en
HVAC Products
29.10.2008
Technical design
The central communication unit contains various function blocks (FB). The functionality
of the unit can be extended by connecting (binding) the digital inputs N.D1…N.D8 and
the universal inputs N.X1…N.X8 to the FB inputs "d", "x", and "i" (see figure and
function block description).
The digital inputs N.D1…N.D8 help connect potential-free status contacts. They act as
fault inputs when connecting digital inputs to FB "Faults". When connected to FB
"Operating hours", the number of operating hours of aggregates (burners, pumps, fans,
etc.), can be counted.
The universal inputs N.X1…N.X8 can be configured for potential-free status and
counting impulse contacts and analog signals from sensors and transmitters.
Universal inputs configured for status contacts (digital) or limit values (analog) and
connected to FB "Faults" act as fault inputs.
When universal inputs are configured for operating status contacts of aggregates and
connected to FB "Operating hours", the operating hours can be acquired.
When universal inputs are configured for counting pulses and connected to FB
"Meters", consumption values (heat, gas, electricity, etc.) can be acquired.
The outputs of relays N.Q1…N.Q4 have NC contacts, those of relays N.Q7, N.Q8 have
NO contacts. To signal faults (e.g. with signal lamps, horns), relay 1 and/or relay 2 of
FB "Faults" are connected to one of the relays N.Q_.
If one of the relays N.Q_ is connected to an FB "7-day time switch with control switch",
relay N.Q_ in "Auto" position operates as per the time switch program, else per the
control switch position "Off" or "On".
d
d
d
d
N.X1
N.X2
N.X3
N.X4
N.X5
N.X6
N.X7
N.X8
x
x
x
x
x
x
x
x
N.D1
N.D2
N.D3
N.D4
N.D5
N.D6
N.D7
N.D8
d
d
d
d
d
d
d
d
1
2
3
4
d
5
i
i
i
i
i
i
i
i
1
2
3
4
5
6
7
8
d
c
4
3
2
1
c
c
c
1
Q
Q
3
2
Q
Q
Ein/Aus
In
pu
t i
de
nti
fie
r
N.Q7
Q
N.Q8
Q
N.Q3
Q
N.Q4
Q
N.Q1
N.Q2
Q
Q
x x x
x
x x
x x x x
x
x x x
Q
Q
x x x x x x
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
d
Ack
c
c
c
4
PC USB
56
63
B
0
1en
System report
Modem
Ethernet
Receiver 4
Calendar
On/Off
Calendar
On/Off
Receiver 2
Calendar
On/Off
Receiver 1
Calendar
On/Off
Message receivers
On/Off
Operating hours
Meters
Intern
R e la y 1 R e la y 2
System
Faults
Receiver 3
On/Off
On/Off
On/Off
Inputs, outputs and function blocks of the OZW775 central communication unit.
Inputs and outputs
Digital inputs
Universal inputs
Relay outputs
