5. Electrical connection
7
5. Electrical connection
All the necessary signals for operation are connected to the rear terminals.
Upper connecting terminals
If none of the options
switching points
or
interface
were implemented, then the corresponding
terminal strip is missing. The switching points are tapped on the 12-pole connector strip.
Depending on the version, there are between zero, two and four changeover contacts
(
NO
rmally-
C
lose,
COM
mon,
N
ormally-
O
pen).
Relay 1
Relay 2
21
22
23
24
25
26
NO
NOC
Com
NO
NOC
Com
Relay 3
Relay 4
27
28
29
30
31
32
NO
NOC
Com
NO
NOC
Com
A serial interface can be
connected via the 3-pole
connector strip.
RS232
41
42
43
GND (RS)
TxD
RxD
or
RS485
41
42
43
GND (RS)
Data B (+)
Data A (-)
The lines of the RS232-interface need to be connected 1:1, TxD to TxD and RxD to RxD.
RxD
TxD
GND
RxD
TxD
GND
IPW5
IPM5
PC
or
SPS
Connection figure PC or SPS
Ù
IPW5
/
IPM5
Interface
RS485
is
connected
via
a
shielded
data
line
with
twisted
wires
(
Twisted-Pair
).
At
each
end
of
the
bus,
a
termination
of
the
bus
lines
must
be
connected.
This
is
necessary
to
guarantee
reliable
data
transmission
on
the
bus.
For
this,
a
resistance
of
120
Ohm
is
inserted
between
the
lines
Data
B
(+)
and
Data
A
(–).
41 42 43
Display 1
Control device
PC or SPS
120 Ohm
Termination
Data A(-)
Data B(+)
41 42 43
Display n
Caution!
The potential reference can lead to a compensating current (interface
⇔
measuring input) with a
galvanic not isolated interface and can thus affect the measuring signals.
