Allen Bradley Micro820 Micro850 has Random IP Address of 169.254.X.X

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If your Allen Bradley Micro820 or Micro850 keeps getting a random IP address assigned in the range of 169.254.X.X then it has DHCP enabled but there is no DHCP server available to assign the PLC an IP address. In these cases, the PLC assigns itself an IP address in the range of 169.254.X.X.
This can easily happen even if you have previously assigned an IP address to the PLC. If you create a new program in Rockwell Automation's Connected Components Workbench, the program will default to having DHCP enabled. If you don't set it to static and assign an IP address in the CCW program then when you download your program, it will revert back to having DHCP enabled.
In this lesson we go through how this happens and how to fix it.
Get the full details of this lesson at twcontrols.com/micro800-conne...
Items used in this video:
PLC Trainer twcontrols.com/plc-trainers
PLC Tools SIM-IPE IP Explorer plctools.com/plc-tools-sim-ip...
The above links make these videos possible. Please use them!
Support these videos while you advance your skills courses.twcontrols.com/

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Опубликовано:

28 июл 2021

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Комментарии : 29

@Hankules19 3 года назад

Thank you, Tim! This is a HUGE help!

@TimWilborne 3 года назад

Glad it was helpful Hank!

@gcol75 2 года назад

Thanks Tim! Just ordered IP explorer.

@TimWilborne 2 года назад

Great, I appreciate it!

@Time-Trvlr 3 года назад

Usually a nic set to dhcp that times out because it cant find a dhcp server will default to a 169.254.x.x, you covered this well.

@TimWilborne 3 года назад

Thanks

@LearningInVR 2 года назад

its been a good problem for me , it really drills into your head the importance of configuring your drivers , you get to learn how to navigate around your network settings and change them, and you can go into rslinx and learn to set the static ip addresses to fix it/ learn about command ping...even serial connection and tools available to help use get through this issue promptly .i watch these videos so many times i think i hear a voice in my head when i start a new project lol.. ." okay first thing we have to set our address " .. some of the steps associated with fixing this problem in different ways teaches very important info for being able to connect to plcs in general

@TimWilborne 2 года назад

It is a good thing to practice that way you know what to do when you run into it out in the field.

@allanvandyke1418 3 года назад

I've had the same problems lots of times when using a micro820 for the first time. Fortunately I have always had a REMLCD connected to the 820. From there it is easy to find its current IP. But, can also find the IP from a laptop using the command prompt and the arp -a command. This will bring up its IP with Mac address. I always get caught out using the micro820 for the first time.

@TimWilborne 3 года назад

Yes, I should grab an LCD to play with.

@allanvandyke1418 3 года назад

@@TimWilborne That will be a useful video. Every time I install a micro820, I always use an LCD with it.

@agnelocosta7934 2 года назад

Hello Tim! How do I discover the Mac ip from a panelview800 ?

@TimWilborne 2 года назад

Our PLC Tools SIM-IPE will do it. plctools.com/plc-tools-sim-ipe-ethernet-ip-address-explorer-dhcp-and-bootp-server/

@agnelocosta7934 2 года назад

@@TimWilborne Thanks I will contact you by e-mail

@tlar1272 Год назад

At 4:47, I get the message "Target Device Reported Error". Not sure what the next step should be?

@TimWilborne Год назад

Are you sure it doesn't already have an IP address?

@tlar1272 Год назад

@@TimWilborne It has an IP address that was assigned by DHCP, not a static IP.

@TimWilborne Год назад

By DHCP do you mean our device or another DHCP server?

@tlar1272 Год назад

@@TimWilborne Both. If I plug it into a computer network connection, I get one address. If I plug it into IP Explorer,I get a different address.

@TimWilborne Год назад

Might be easier to send me an email, it's usually a problem with your network settings of the IPE.

@lorinmcarthur9947 Год назад

When trying to change a DHCP address in a Micro 820 with the IPE my device gets stuck on the Waiting for BOOTP or DHCP Request screen. What am I doing incorrectly?

@TimWilborne Год назад

There is an issue with the Micro820, it does accept the "Enable DHCP" command. Rockwell Automation is aware of it.

@hrc100 2 года назад

Tim. Computer IP=192.168.1.105, Micro 850=192.168.1.102 (I already made communication between them), HMI t4t= 192.168.1.104 (I can not see the HMI in the connection browser), I tried using the same IP address PLC/HMI, but nothing yet. where am I failing?

@TimWilborne 2 года назад

If you can ping the HMI but not see it in the connection browser then check out this video. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE--N1meHqahlg.html

@elijahkintz996 5 месяцев назад

is there a way to fix this without having to buy an IP explorer ??

@TimWilborne 5 месяцев назад

Yes, just not an easy one :)

@wayneclift8598 3 месяца назад

@@TimWilborne In all seriousness, I run a high school lab with 40 laptops connecting to a trainer. The PLC is set to DHCP, so we have do discover the new IP every time a student plugs in or turns on. There must be a reasonable way to set the Micro820 to a static IP without a special tool. I only have to do this once, and if the method involves a couple more hoops without a special tool, so be it. What's the method? And if I am picking a static IP for it, can I pick any value? Or must the static IP's first two pairs of numbers need to match my local network? Thanks for the advice!

@ryankirby3520 2 месяца назад

@@wayneclift8598 I'm not an expert, but I did arp -a in command prompt as suggested above while connected to a micro820. I then used that to configure IP address in CCW. I then set that as the static IP address on my laptop. The first time I did have to click Device - Connection Path - Browse in CCW to find the IP address that I set. Since then, it connects every time by just clicking connect.

@ryankirby3520 Месяц назад

@@wayneclift8598 I used arp -a in command prompt after connecting to the PLC. I then take what is there and set the IP address in the PLC. I also had to change my static IP address on my laptop. I had to browse for it the next time I connected to the PLC, but it has worked every time after that by just clicking connect.