Omron Ethernet IP Error

I am using a CJ2H-CPU66-EIP controller. This device has an IP address 192.168.1.1 with a subnet mask 255.255.0.0

There is an error 'F3' on the front 7 segment display. The user's manual tells me this means there is a address mismatch. I have checked the front node address setting switch and it's set correctly (0 and 1). The PLC is operating normally otherwise to the other EIP nodes. I can ping all the other nodes without issues.

I just don't know how to get rid of this error and what's causing it.

Have you cycled power to the CPU after changing the switches?

I changed the subnet mask to 255.255.255.0 and the error went away.

kku said:

I changed the subnet mask to 255.255.255.0 and the error went away.

Click to expand...

With a subnet mask of 255.255.0.0 the node address is 0001 0001 so the node address on the rotary switches should be 11. 1001 binary = 11 hex

chelton said:

With a subnet mask of 255.255.0.0 the node address is 0001 0001 so the node address on the rotary switches should be 11. 1001 binary = 11 hex

Click to expand...

I just got it. Now I understand. I think the .255 in the third octet filters out the third number in the IP address. That's why if the mask is 255.255.0.0 then the node address is 0001 0001.

chelton said:

With a subnet mask of 255.255.0.0 the node address is 0001 0001 so the node address on the rotary switches should be 11. 1001 binary = 11 hex

Click to expand...

With a subnet mask of 255.255.0.0 the node address is 0001 00000001 so the node address is 1 00000001 = 101 hex. This can not be set on the rotary dial switches. FF is the max node address.

chelton said:

With a subnet mask of 255.255.0.0 the node address is 0001 00000001 so the node address is 1 00000001 = 101 hex. This can not be set on the rotary dial switches. FF is the max node address.

Click to expand...

You are right. I just realized it this morning. The maximum you can set on the front switches is 254 (FE).

Thanks.