OMRON CJ1 PLC's Ethernet Connection

[gcastro]

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.

 

[OldPfart]

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

 

[gcastro]

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

 

[OldPfart]

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