JiM_cz

Connection between laptop and the PLC sometimes interupted - USB cable too long?

5 posts in this topic

Hello Guys, sometimes it happens to me that when I'm monitoring PLC with my laptop through a USB cable the connection is cut with the red (or yellow?) flashing message at the bottom of the screen of the cx programmer. I have to unplug and plug in the usb (on laptop side) and press "work online" again. Sometimes it's more often, sometimes less.

My USB cable is a new one and good quality (golden plated and shielding) and about 4.5 meters long. I remember I read somewhere in the manual that the max length should be 5m and that's why I'm confused why it's happening.

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May be some noise in your system. Please try to change PLC with same cable then check again.

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It happened also to me before, although on the NB HMI to laptop connection.  I used also a 5  meters long USB cable, and I have issues with connection.  I am using a shorter usb cable, 2 meters, and my connection is good.

Anyway, try to use a shorter usb cable, and check again.

 

 

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Check your power settings. The USB port is most likely powering down.

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