Help with LAN network

[Cwayman]

I am trying to set up a brand new network of PLCs and GOTs in a classroom. Something I haven’t ever done before.  I’m using simple Ethernet and going from a pc to a switch then the switch to each device.  I can not get anything to communicate to each other.  I can read from one GOT or one PLC but that’s it.  Any help would be appreciated, thank you!

[BobLfoot]

Let's start with and eliminate the basics.

Make sure the PC , ALL PLC and ALL GOT are in the same IP Subnet and Mask Setup and that the switch ports are configured to handle that subnet.

For a classroom scenario I'd use a Commercial HUB rather than a switch just to simplify, but that's me.

[Crossbow]

I disagree with Bob on the hub, switches (unmanaged even) are the way to go for traffic considerations.

First, did you set a unique IP address on each device?  All of my PLCs come out of the box with the same address set, and that's not going to work when networked.

[BobLfoot]

@Crossbow when I suggested hub I was thinking of an isolated one cell classroom with no internet or uplink considerations.  If the case is for more connectivity than that then switches are a best call.

[Cwayman]

@Crossbow I have tried to do that but any time I exit out of GX Works 2 it resets to the original IP address I believe.  
@BobLfoot I think I am going to go with a hub mainly because this is one classroom cell with no outside access.  The hub will be the easies to set up I think.

[Crossbow]

If you change the IP address of the controller you need to download those changes to the controller.   There is no reason it would return to default if it was set. 

[Gambit]

Make sure all the GOT have their own station nr. 

[Cwayman]

@Crossbow You are right, I hadn’t properly written the IP settings to the controller for it to stick.  I ended up going with an unmanaged switch but I had to change my IP address on my desktop to match.  Thank you for your help everyone