Hi, 

I'm fairly new to this programming game, and I'm finding it very fun so far. 

As an automatician, this has been something that I have been missing, to fully comprehend automation systems. 

Now onwards to my challenge.

I'm using a S7-1214C CPU, currently working on my motor controll FB. 

I've made a PLC data type, called  HMI_Motor, that I intend to use for my faceplates in the HMI. 

When I add parameters, such as inputs, outputs etc for the FB, everything works when I use drag and drop from the list (cannot rember name of it) above the block interface page. But when I finnaly drag the HMI_Motor TAG into the block interface, it turns red, and gives the error "Access is invalid. User manual gives me the code 604:4542 and the following text:

unknown user

Description

The structured data in the InOut area of an instance DB is stored there only as a reference (48-bit POINTER). Global access to its components is not possible.
You have possibly also attempted to access a data element of a technology object in a multi-instance or in an instance DB.
This type of access is not possible.

Examples of non-permitted access:

<DB1_IDB1>.<InOut String, Struct..> <#Multiinstance>.TO_Axis_PTO.Config.Mechanics.LeadScrew <DB1_IDB1>.TO_Axis_PTO.Config.Mechanics.LeadScrew

Remedy

Check the DB names and components.

I've had a look at the DB names and components, but I'm not sure what to look for in order to correct my mistake. 

 In advance, thank you for all answers, improvment is key

Hi, 

thank you for answering, I did not recieve a notification of this, so here is the picture of where I am attempting to use my data type. 

Wallem

thank you for answering, I did not recieve a notification of this, so here is the picture of where I am attempting to use my data type. 

Hi!

What is #PU01? Is it an instance, or multi instance, or global data block? 

Hi again and thank you for the swift replies. 

I figured it out after some of your pointers. 

I was in fact using a multi instance for the main part of this block, which is within an FB called "pump control" and then the motor controller FB is called within that FB again. 

When I added the parameters for the HMI data, this should have been routed to a global DB, that I have now created and it is no longer giving me any errors. 

a few more hours of tweeking and I can upload this to the PLC and finnaly begin testing my first real project.

Thank you again