×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

OMRON CJ1 PLC's Ethernet Connection

OMRON CJ1 PLC's Ethernet Connection

OMRON CJ1 PLC's Ethernet Connection

(OP)
Currently we have setup a CJ1H-H CPU65 with two CJ1W-ETN11 units (ethernet units) and a CLK21 unit (controller link unit). It is connected via a wired Ethernet connection to a PC and to a CJ1G-H CPU42 (with Ethernet and controller link units) via a wireless Ethernet connection through two LINKSYS 2.4 GHz Ethernet bridges, one at each side of the connection. Communication between the two PLC's is okay. However, we have started testing with parts of the machine which involve 48 other wireless devices and in the future there will be 120. We have had communication problems. To rule out or to confirm that an overload of the wireless network is causing the communication problems between the two PLC's, I have been trying to replace the wireless connection with a wired connection with no success.
I used a cat 5e crossover Ethernet cable from the CJ1H-H PLC to a switch and from the switch to the CJ1G-H PLC, I used a cat 5e straight cable. I would appreciate your help regarding this issue, as well as any suggestions regarding other networking strategies to overcome this problem.

RE: OMRON CJ1 PLC's Ethernet Connection

Usually one has to use crossover cables on all runs from a switch. Hubs use straight cables.

RE: OMRON CJ1 PLC's Ethernet Connection

(OP)
Hello OldPfart.
If I understand correctly what you are saying is that you would use cross over cables on both sides of the switch.
i.e. a crossover from PLC1 to the switch and a crossover cable from the switch to PLC2. Is this correct ?

Thanks

RE: OMRON CJ1 PLC's Ethernet Connection

Yes. Switches usually require crossover cables. Hubs use straight through cables and do the crossover internally.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources