Cable Selection - Advantech AMAX-5000 Series User Manual

Figure 2.5 shows some possible channel architectures according to these rules.
2.4

Cable Selection

The IEC 61784-5-12 profile describes suggested cable types for EtherCAT applica-
tions and specifies the worst-case corner values for the cable parameters which
should not be exceeded within an EtherCAT channel.
In case of connections between devices moving with respect to each other, flexible
cables should be used in order to prevent cable damage. In this case, parameters
like maximum permissible bending radius, as well as maximum tolerated tensile and
torsional forces, should be carefully verified to be compliant with the application
requirements.
Figure 2.6 shows the difference between a fixed cable and a flexible cable in section
views, and Table 2.1 lists the recommended parameters for both types of cables to
be used for an EtherCAT channel. Parameter values (for example, insertion loss)
measured for flexible cables are typically worse than those of fixed cables. The use
of flexible cables should therefore be limited to scenarios where it is strictly needed.
Figure 2.6 Difference between a fixed cable and a flexible cable
Table 2.1: Recommended Cable Parameters.
Item
Type
Shielding
Round-Trip Resistance
Insertion Loss at 100 MHz
Near-End Crosstalk at 100 MHz
Figure 2.5 Several possible channel architectures
Fixed Cable
AWG22/1
S/FTQ
≤ 115 Ω/km
19.5 dB/100 m
50 dB/100 m
Flexible Cable
AWG22/7
S/FTQ
≤ 115 Ω/km
21.3 dB/100 m
50 dB/100 m
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