Installation
3-21
ET 200X Distributed I/O Device
EWA 4NEB 780601602-06
How to proceed with the ET 200X-DESINA and ET 200X-ECOFAST with RS 485
Interface
Connect these bus nodes using DESINA hybrid cables with copper conductors
(RS 485).
Attach the terminating resistor for the first and last bus node on the right-hand
DESINA connector of the relevant BM 141-ECOFAST or BM 143-DESINA RS485
basic module.
You can find the order numbers for the terminating resistor in Appendix A.
Terminating resistor
PROFIBUS-DP with
RS 485 interface
Figure 3-15 Attaching the terminating resistor
Note
The terminating resistor is supplied by the non-switched DC 24 V-NS load voltage.
The terminating resistor can only be guaranteed to function without problems if the
non-switched DC 24 V-NS load voltage has a tolerance range of ±10%.
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