Addressing of Control Techniques VFDs

Hi all,

I can't figure out few of addresses in HMI connected to Unidrive SP with RED lion G306 that I inherited. They communicate via modbus, and most of the addressing is for example 401909 meaning 4 - for holding registers, menu 19.09. But i have a few that read 418405. Now 4 is still for holding registers. But other digits don't make sense, there is no menu 84.05 (what's 1 for then?), there is 18.40 but that is only a bit, and what is 5 for then, and HMI reads long word from this address.

I can't match them to any address in the drive.

Any ideas?

Thanx all!!!

do you have any modules installed in the Drive?

It may be option module 1 then an internal address

MichaelG said:

do you have a UD70 installed?

Click to expand...

I have SM-EZmotion in slot 3 that comes up under menu 17. No UD70 tough.

grab the ez motion manual
you are getting a parameter directly from it
(UD70 was a previous version of drive)

Uhmmm, i've been reading this manual, but it doesn't explain this addressing at all unfortunatelly.

Unidrive SP Advanced Users Guide
- Serial Communications Protocol
- CT Modbus RTU Specification
- Extended data Types

It is setting INT32 type reads.


To interpret your address of 18405 subtract 16384 ( '01' in top 2 bits ). This leaves 2021 - menu 20 item 20 (or possibly 21 - I'm not sure)

bernie_carlton said:

Unidrive SP Advanced Users Guide
- Serial Communications Protocol
- CT Modbus RTU Specification
- Extended data Types

It is setting INT32 type reads.


To interpret your address of 18405 subtract 16384 ( '01' in top 2 bits ). This leaves 2021 - menu 20 item 20 (or possibly 21 - I'm not sure)

Click to expand...

Hi Bernie, you are right, it is for 32 bit reads. I had a look at that part of the manual, but I still can't see the connection between described formats and my addressing of 418405. Would you care to point it out if you know?

I don't know where they got X value in the example not that number 16384!

Thanx!!!

The added on number for extended addressing is the top 2 bits , 00 being the standard types, 01 being 32 bit INT addressing ...

'01' in the top two bits is 16384. So, to convert a standard menu/item address to this for is done by adding 16384.

So, does menu 20 - item 20 mean anything to you? Does it make sense given what the Red Lion is showing in this item?

(All I know is what I read in the manual, I've never used this, but it looks right.)

bernie_carlton said:

The added on number for extended addressing is the top 2 bits , 00 being the standard types, 01 being 32 bit INT addressing ...

'01' in the top two bits is 16384. So, to convert a standard menu/item address to this for is done by adding 16384.

So, does menu 20 - item 20 mean anything to you? Does it make sense given what the Red Lion is showing in this item?

(All I know is what I read in the manual, I've never used this, but it looks right.)

Click to expand...

Ahhh OK got it now. Makes sense. Yes, 20.20 is part of the menu for the drive.

Altough I always get 1 valus smaller when calculating than what is addressed in the HMI. Driver in HMI probably takes care of the -1 part of equation formula described in the manual.

Many thanks for the help!!!

Now I need to get them communicating again