‑39‑
The cable between devices cannot exceed 100 m when the EtherCAT bus is used,
exceeding of which may attenuate the signal and affect normal communication.
Technical requirements
100% continuity test, without occurrence of short circuit, open circuit, misalignment,
or poor contact. Cables meeting the following requirements are recommended.
Item Specification
Cable type Flexible crossover cable, S‑FTP, Cat5e
Standard compliance
EIA/TIA568A, EN50173, ISO/IEC11801
EIA/TI Abulletin TSB
EIA/TIA SB40‑A&TSB36
Cross sectional area AWG26
Cable category Twisted pair
Number of pairs 4
4.5 RS485 Communication
It is recommended to use a shielded twisted pair cable for the RS485 bus. Connect a
120 Ω termination resistor to both ends of the bus to prevent signal reflection.
Connect the signal reference grounds of all nodes together. Up to 31 nodes can be
connected and the distance between branches must be less than 3 m.
The RS485 bus topology is shown in the figure below.
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