changing node# ML1000

Hi Guys, requiring some help please in changing Node #, I’m using RSLOGIX500 V9, RSLINX Classic Gateway V2.59.
l want to change the node #’s on 2x ML1000 (1761-L20BWA-5A) as l wish to have 2 units running between 2 x 1761-NET-AIC making a network so l can try sending messages between the PLC’s.
I have previously done this but now can’t remember how l did it. I have re-read both manuals without any luck. Currently trying to change the node # of 1 plc via USB-RS232 and direct connect. When l change the node # via Controller/Control Properties/Control Communications/Processor Node. Then try to go “download” via RSlogix, get failed to connect.
When looking in RSWHO it only will see Node 1.
When l have the PLC connected to 1 AIC, l can see it in linx, still node 1
Screen shots attached.
Thanks to any responce.

I just tried this connected with a serial cable with a ML1100 and go the same results. When I changed over to Ethernet I could see that the node was changed.
I think this is the issue from the help file:
Processor Node
Enter the node number assigned to the processor you wish to communicate with. DH-485 comms supports up to 32 nodes (entered in decimal 0-31) and DH+ comms supports up to 64 nodes (entered in octal 0-77). When you are communicating to a MicroLogix controller directly, this does not apply.

So it sounds like if you are connected directly to the PLC it will always show a 01 for the address. But when you disconnect that connection it will go back to what ever you set it at in the program.

PLCnovice61,

To accomplish what you are trying to do I believe you are going to have to configure
the ML1000's comm ports to DH485. Then give each a different node address.
After doing this you will need a 1761-UIC ( USB to DH485 converter) to get reconnected to the ML1000's to monitor or make programming changes.

Hi Bullzi and Mickey, thanks for your response. I have been back to play and can talk between #1-#2-#5
Via RS232 thru the AIC. But can’t talk to PLC #4.
The AIC should do the DH485 and l talk to the first AIC via USB convertor?
l have also tried making 1 PLC status bit S/0/10 to change it to DH485 without luck.
Thanks for any more suggestions

Sorry had some screen shots that didn't get sent.

What driver are you using in RSLinx?

Can you post the programs of both PLC's. Zip them first.

Hi Mickey, using DF-1, DH483 driver as per screen shoots.
Thanks

If you want to to communicate with both PLC's at the same time you are going to have to use a DH485 driver ( 1747-PIC/AIC+ Driver) in RSLinx, if your PC has a real serial port.
If you don't have a real serial port then you will need a 1761-UIC ( USB to DH485 converter), your USB to RS232 adapter will not work.

The reason you are connecting to one of your ML1000 is they have a unique feature that will change its ports protocol to match to device that is trying to communicate with it. But DF1 full duplex is a peer to peer protocol, it will only talk to one device at a time.

Mickey said:

If you don't have a real serial port then you will need a 1761-UIC ( USB to DH485 converter), your USB to RS232 adapter will not work.

Click to expand...

Sorry that should be 1747-UIC. See manual

Hi Mickey, l have had the ML1000 talking with the NET-AIC without the AB 485 converter (as l don’t own one). Could it have been via a USB/232 converter to a SLC500/04 CPU then 3 wire DH485 to the NET-AIC’s with the ML1000 analogue hanging off the AIC? As l have had the ML’s with different node numbers showing up in Linx and been able to switch between run/program and program the ML’s.
Thanks

PLCnovice61 said:

Hi Mickey, l have had the ML1000 talking with the NET-AIC without the AB 485 converter (as l don’t own one). Could it have been via a USB/232 converter to a SLC500/04 CPU then 3 wire DH485 to the NET-AIC’s with the ML1000 analogue hanging off the AIC? As l have had the ML’s with different node numbers showing up in Linx and been able to switch between run/program and program the ML’s.
Thanks

Click to expand...

The AIC is a RS232 to RS485 converter. Its also a RS232 isolator. It is not a protocol converter.

A SLC5/04 has a serial port and a DH+ port, if you were connected to its serial port with a USB to serial adapter, then trying to connect an AIC to its DH+ port would not work.