Sample program: S7 communication GET and PUT instructions

good job that's work good thanQ  very much 

Hello,

I will be communicating with a supplier's PLC (therefore I will not have access to their project) and plan using the GET and PUT instructions. My question is the following : The data in the datablock that will be retrieved and send to my supplier's PLC has several different data types (bool, int, word, etc), how should my pointer look like in this case?

I.E; P#DB1.DBX0.0 ????? ?

Thanks, for your insight

Hi,

Correct me if I am wrong about the sample GET/PUT project given here, but it has one big flow. As I understand, every Get or Put call in the sequence should be activated by successfully OR UNSUCCESSFULLY finished previous job, right?

In this example, what is happening when GET1 (first GET call) returns an Error? By this code, the next call GET2 will not be triggered.

What will happen if GET2 returns an Error? Get3 will not be triggered.

What will happen if GET3 returns an Error? Put1 will not be triggered.

...and so on.

So, very simple change in code resolves this, not only NDR from the previous call should triger next, but NDR OR ERROR of previous.

I am working GET/PUT communication based project and I can´t figure out what this means that is written in the addres field (P#DB1.DBX0.0). What does (part of the example DBX0.0) it means in this example? Do I have to write DBX0.0 evry time in the addres field or is this variable? And if it´s variable, what does it depend on?

Hello pedjaiv;

Actually, the Address and SD_1 (or RD_1 for the Get function) parameters are specified using ANY pointer format.

This is an ANY pointer: P#DB11.DBX0,0 Byte 10

It is divided in 2 sections, the start address and the length (and datatype). In the example above the pointer points to the first bit in DB11 (the start address is always specified to the LSB of the block of data), and specifies a length of 10 Bytes (it could be Words, Dwords, Reals...).

This format is very useful for communication blocks and copy/move functions, since it integrates the definition of a complete block of data in a single definition, without having to set a start and stop address.

If you have need of more precise definitions, look for ANY pointer in the online help of your programming software.

For more examples of the use of ANY pointer in PUT and Get functions, look at the programming sections of the following FAQ:

How do you configure and program an S7 connection and the FB15 "PUT" und FB14 "GET" function blocks for data transfer between an S7-1200 CPU and an S7-300 CPU?

https://support.industry.siemens.com/cs/ww/en/view/92269951

Hope this helps,

Daniel Chartier

Thank you so much Daniel, You´ve helped me a lot with this. 

Hi Guys,

     I am using this instruction for plc Et200s cpu im151-8 to labview communication,it is possible or not,if possible can you give some idea

Regards

shanthakumar

Hello,

but sry, probably you waste time, better can be look (as I recommended to you before) to Labview options, what kind of interfaces/protocols are available there.

Hello

I have a PLC 1500 (TIA Portal) and a PLC 400 (Step 7 V5.5). Is it possible for me to make a GET / PUT only in Step 7 V5.5 in the PLC 400 program?

Regards

Cleiton