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Does it matter where the pull up / pull down resistors are located within the ATV31 multiple drive network?

Published date: 24 June 2020

Issue:  Pull up / pull down resistors location within the ATV31 multiple drive network
 
Product Line:   ATV31
 
Environment:  All
 
Cause:   Terminating resistor
 
Resolution:   Not really.
  
The ATV31 does not have internal pull up / down resistors for the rs-485 communications. Therefore, if it is used on a network with PLC that also does not have pull up-down resisitors for the RS485 resistors must be added at one of the devices.
At one drive add:
10k resistor between +10 (RJ45 pin 7) and D_B (Communication +, RJ45 pin 4)
10k resistor between D_B and COM (RJ45 pin 8)
4.7k resistor between COM and D_A (RJ57 pin 5)


 

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