Figure 22: Fresnel Zone; Table 39: Radii To Be Kept Clear - WAGO I/O-SYSTEM 750 Manual

72 Mounting
line-of-sight link within a specified radius (the so-called 1
see figure "Fresnel zone"). If this zone is even only partially blocked by any
objects the achievable range can quickly be cut in half.
To achieve maximum range when using WAGO antenna 758-912, the following
conditions must be met:
• "Real-Time Communication" mode is used.
• The transmission power is set to the maximum value allowed at the place of
installation (observe local and national codes).
• The antennas are parallel to each other.
• The antennas are on the same level, i.e. a straight line connecting the centers
of the antennas is a right angle to the longitudinal axis of each antenna.
• There is a direct line-of-sight link between the antennas in which a radius
according to the 1

Figure 22: Fresnel zone

The shape of the 1
(twice the radius of the 1
The table below lists the radii that are to be kept clear:

Table 39: Radii to be kept clear

Distance
100 m
200 m
300 m
400 m
500 m
750 m
1.000 m
st
Fresnel zone is free of objects along the line-of-sight.
st
Fresnel zone is roughly an ellipse whose largest diameter
st
Fresnel zone) is at precisely half the distance.
Version 2.0.0, valid from FW/HW Version 03/03
WAGO-I/O-SYSTEM 750
750-644 Bluetooth
st
Radius 1 Fresnel zone
1.7 m
2.5 m
3.0 m
3.5 m
3.9 m
4.8 m
5.5 m
®
RF-Transceiver
st
Fresnel zone –
Manual