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Old April 15th, 2011, 05:30 AM   #1
Lilith
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RJ45 to RS485 pinout

Hi guys!

I'm trying to build a cable to connect twido plc (RS485) and altivar71 (RJ45). Anyone knows pin-out for this connection? Does it matter which ethernet cable i use (a or b, images attached)? Thanks!

typea.jpg

typeb.jpg

rs485.jpg
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Old April 15th, 2011, 10:12 AM   #2
kittydog42
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It should be a fairly easy connection. It doesn't matter which type of Ethernet cable you use since the RJ-45 connector doesn't actually use Ethernet at all, and you only need positions 4 and 5 which are the same colors on both types. You'll connect the blue and blue/white pair to terminals A and B on the Twido. You'll have to try both polarities to determine which is correct.
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Old April 15th, 2011, 10:20 AM   #3
Lilith
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So i don't need to use the third pin (SG) on rs485 connector? I will try that, thank you very much!
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Old April 15th, 2011, 11:13 AM   #4
kittydog42
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If you have any issues, connect the brown wire from the Ethernet cable to SG.
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Old April 26th, 2011, 05:12 AM   #5
Lilith
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Quote:
Originally Posted by kittydog42 View Post
If you have any issues, connect the brown wire from the Ethernet cable to SG.
Thank you, i've made the cable but i'm still unable to start the motor. I use following devices:

HMI XBTGT 4330 7"
Programming software: VijeoDesigner 4.6.0.7613

Twido PLC TWDLCAE40DRF
Programming software: TwidoSuite 2.0

Altivar 71

Ethernet communication between HMI and PLC works fine, i can set the speed on HMI and correct value is displayed in animation table on PLC. I used following settings on Altivar:

Communication - Modbus Network:
Address: 2
Baudrate: 19200
Data bits: 8
Time between frames: 10
Command: Ref.channel 1: Modbus
Ch1 active
Profile Not separ.

System word %SW64 keeps returning (modbus) error code 8. I have NST message on Altivar with these settings; if I try to use I/O profile it says RDY but does not receive anything from PLC, or returns CRC 2. I've read manuals, checked wiring and tried pretty much everything I could think of, but no luck

HMI and Twido programs are included in attachment. I would be very grateful for any suggestion regarding this issue. Tyvm!
Attached Files
File Type: zip Programs.zip (321.6 KB, 73 views)
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Old April 27th, 2011, 08:28 AM   #6
tpiatkowski
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Looking over your Twido program I have noticed that both RS485 ports (mini-din) and the terminal block option block share the same Modbus address of 1.
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Old April 27th, 2011, 09:30 AM   #7
Lilith
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Thanks, i'll try to change it and see if it works .
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