Mitsubishi GX Head Address

Hello,

I'm trying to convert a GX project to RS Logix 5000.
I need understand what the following line of code means:

[ TO H0 H3 K1000 K1]

I read the manual which says that H0 is the head address of special function on base unit. and. H3 is the first number of memory address area to be written to.

I dont know how H0 and H3 relate to the hardware config.

Can someone explain please?

Thanks!

P.s. I've attached the project

Hi
The head address is the slot number of the rack where the card is

The seconds address is the buffer memory within that card

basically your posting data to a special function module