I've looked for this on the forum but wasn't able to find a concise answer (sorry if this has been discussed before).

 

I have a bunch of insteon devices and am concerned about hitting the limits of either the PLM or ISY with regards to number of devices if I add more. What is the easiest way to determine how many more devices/nodes you can add at any given time?

 

Thanks, Kevin

The limits are based on both devices and scenes as well as programs. The ISY994i Pro has a limit of 1024 devices/scenes and 1000 programs.

What about the PLM, isn't it a lot more limited? And if so what's the easiest way to determine if your approaching these limits?

The 2413S PLM supports 992 link records.

 

Run Tools | Diagnostics | Show PLM Links Table.   Do it 3-4 times until the same total link number is repeated several times.  Inbound messages affects the Next pointer so Show link count can be too high or too low if traffic is received.  Also deleted links are counted so doing a File | Restore Modem (PLM) which eliminates deleted links may be useful. 

Edited June 13, 201510 yr by LeeG

Don't forget to add 1 to the total as the count begins with 0, not 1 or click on Count which will add 1 for you

Edited June 13, 201510 yr by stusviews

Ok, the first time I ran it I got: 780, but the next 10 times I got: 502. So it looks like I have plenty of room available to add new devices.

 

Couple more questions:

 

1) are there any other limitations I should be aware of (other than the ISY PRO 1024 device limit, 1000 program limit & the PLM 992 link limit)?

2) what creates links on the PLM? (Is it just new devices & scenes?)

3) are there any issues if you get close to the PLM link limit? (ie performance, strange behavior, etc)

4) are there any dangers/concerns about doing a PLM restore? (I'm always weary of doing any kind of 'restore' for fear of wiping stuff out, etc)

 

Thanks again in advance, Kevin

Edited June 14, 201510 yr by Tungsten

2 -  Any scene communication (PLM to device, device to PLM) requires a link record in both devices.  For a SwitchLinc to send command to PLM (ISY) when paddle is pressed requires a Controller link (starts with E2) in device and Responder link (starts with A2) in PLM.  These links are created when device added to ISY.

 

All Scene communication from PLM to device requires a Controller link (E2) in PLM and Responder link (A2) in device.  These are created when Scenes are defined.

 

3 - No.

 

4 - No.  Only consideration is information in ISY reflects current devices.  A File | Restore ISY to an earlier backup that does not reflect current devices would create issues for any PLM or device restore.  As long as ISY is current no concern for doing a Restore.