Connecting up
4.4 Connectors for external antennas and power supply
SCALANCE W788-xPRO/RR / SCALANCE W74x-1PRO/RR
Operating Instructions (Compact), Release 08/2007, A5E00413342-05
95
As an alternative or in addition to this, you can also use the M12 plug for the power supply
(position B in the previous figure).
You can fit additional antennas to the sides of the SCALANCE W788-2PRO and
SCALANCE W788-2RR with an antenna cable (position C in the previous figure). If you
install the SCALANCE W788-xPRO/RR or W74x-1PRO/RR in a cabinet, you will need to
unscrew the antennas due to the restricted communication (position D in the figure). In this
case, the connection is over detached antennas installed outside the cabinet. On the front
panel, there is also an identifier for the antenna connectors. The A connectors are on the
right-hand side and B connectors B on the left-hand side.
Suitable connecting cable for a connection between SCALANCE W788-xPRO/RR or W74x-
1PRO/RR and a detached antenna are available from SIMATIC NET. You will find detailed
information in the section "Suitable antenna cables and antennas for the SCALANCE W-
700".
Arrangement of interfaces and connectors
Note
The distance between a pair of antennas for the first and second WLAN interface must be at
least 0.5 m.
NOTICE
Terminating resistor
Each WLAN interface has two antenna connectors. If you use only one connector, make
sure that you connect a terminating resistor to the second connector to ensure trouble-free
operation of the SCALANCE W788-xPRO/RR or W74x-1PRO/RR.
The following figure shows the location of the sockets for the individual interfaces:
SIEMENS
A2
A1
SCALANCE W788-2PRO
S VP JM 123 44-72-22
M
L2
X1
P1 FOR LAN ONLY
L2 DC 24V
WARNING:
EXPLOSION HAZARD.
DO NOT CONNECT EQUIPMENT
UNLESS AREA IS KNOWN TO BE
NONHAZARDOUS
M
X2
L1 24VDC
788-1ST00-2AA6
A2 ANTENNA A1
B2
B1
Figure 4-3 Antenna connectors of the SCALANCE W788-xPRO/RR or W74x-1PRO/RR. The
antenna connectors A2 and B2 only exist for the types W788-2PRO and W788-2RR.
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