How to change Channel 0 address on SLC-5/03

Ian S · May 6, 2005

Does anyone know if I can change the Channel 0 node address of an SLC-5/03 from within the ladder program?

I know you can address Channel 1 by changing S:15 and re-powering, but there doesn't seem to be an equivalent for channel 0.

(I have six identical PLCs, but they need to have different Channel 0 addresses because they are all linked together on a multi-dropped, leased-line modem-network. I want to avoid having to maintain 6 copies of the software with different addresses.)

Thanks for any help you can give,
Ian Shaw

OkiePC · May 6, 2005

I think your best bet is to have six copies of the program. Put a label near the processor for each machine that identifies the node number and program name. Having just one copy of the program is a nice ideal, but really isn't practical in most cases. Just my opinion...Paul C.

jstolaruk · May 6, 2005

You can change channel 1's node address through the status file but OkiePC has stated the correct implementation.

rstech · May 6, 2005

You can double-click Channel Configuration under the Controller tab of the project tree in RSLogix500 to make changes to the different communication channels.

rsdoran · May 6, 2005

I agree with the original replies. If you have 6 machines then you should have 6 copies of the program...one for each machine. I have worked with multiple types of machines that had identical programs but they were named similar..ie Roll Winders.
RW105072000....Roll winder 1 with date of last changes..05/07/2000.

A little more organization is needed but in the long run it will make life easier.

The above was an example, I like to use the machines serial number for the project name where possible and date stamp changes if possible.

Ian S · May 9, 2005

jstolaruk,

Do you know which registers in the status file to change? I can only find the registers for node 0.

To the rest; thanks for your replies. My customer has specifically asked for a single program, and I intend to comply with his wishes if possible.

jstolaruk · May 9, 2005

Help feature shows the low byte of s:15 controls the node address for channel 1 (high byte control the baud rate). A program compiles with the rung "MOV n7:0 s:15" but I've never actually tried it in a running processor to see it work. Do you have to re-Boot the processor?

Hope that helps.

rsdoran · May 9, 2005

I still think 6 copies labeled appropriate would make more sense BUT.

You want to change NODE ADDRESS...correct. The status files for the addresses are S:67 to S:82. I dont have a 5/03 to experiment with but it seems you should be able change the node addressing within these files.

Ian S · May 11, 2005

S:15 is the node address for channel 1, as I mentioned in the original post. You CAN change it with ladder, but you then have to recycle power to make it take effect.

S:67 to S:82 are some sort of Active Node table. I haven't ever seen them change from 0, so it doesn't look like they store the Channel 0 address.

Thanks everyone for your ideas, but it looks like I'll have to do it the boring way.

How to change Channel 0 address on SLC-5/03

Ian S

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Ian S

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