Truncate block PCS7 7.1

Hi.

I could not find a block to truncate (TRUNC) real numbers in PCS7 7.1, e.g. 2,78 >> 2. Does not exist for PCS7?

Is there a block to convert miliseconds to time (hour, minutes and seconds) alrealdy developed for PCS7 ?

regards.

 Hi Oreca.

Right, but when I use R_I block the value is rounded up, e.g. 2,87 to 3. I just want the integer part "2" (TRUNC function of STEP7).

regards.

Oreca

Hi Berg,

There is a block called: "R_I" FC106 in the CFC library. The input is a REAL and is converted to a INT. Or do you need a REAL output?

For the conversion of TIME, I don't think there is a block available. In this case you have to develop a SCL code (preferably).

Berg,

I think you have to develop the block yourself with SCL (Default programming language for PCS7). Please let me know if you need help with that.

 Hi Oreca,

Yes, I would like your help. I have a Real variable that corresponds to number of hours, e.g. 2.67 hours and I need to show this in WinCC as hours and minutes (hh:mm >> 02:40).

Can you guide me in SCL programming ?

regards.

Oreca

Berg,

I think you have to develop the block yourself with SCL (Default programming language for PCS7). Please let me know if you need help with that.

Hi Oreca !

Thanks for the help and the SCL code. I adapted it today to convert from Real (hours) into String (hh:mm:ss) for easy use in WinCC. 

Is really an Entire AS download needed in this case ? 

Best regards,

Berg

Oreca

Hello Berg,

Well, I made you a SCL source which is attached and also a print screen of the block in test mode. You now have a REAL input and a REAL output which is truncated. Also, the input is converted to the "TIME" format which outputs a time.

I notice in your last post that you do not have experience in SCL programming? I will list down the procedure on how to use this in your project.

SCL is the default programming language for PCS7 to create user block types of which you can also use in WinCC.

1. You have to input the source to your source folder preferably at your master library and distribute then to your project(s). Or just to your project if you do not have a master lib. Go to your SOURCE folder and right click->Insert new object->External source and select the source I gave you.

2. In your symbol table (master lib. or project) create a new symbol called: "R_TO_TIME", This is the name of your function block, which is in the SCL source. You have to give in a FB number. Use a FB number above 2500 because of the standard Siemens FB blocks.

3. Open the source and compile the source + save. (Compile button is the left icon under "View"). A block type is now generated according to the source file. You can now use this block in your program.

4. Open a CFC chart where you want to insert the block and select from your "S7_program" library the block. (S7_program is the default name of your AS program folder).

5. Compile+download AS

I already gave the "Output" the attribute: S7_m_c, which means you can use this variable in WinCC and use it to display the time. For your information, the S7_dynamic attribute is used to see the actual values in test mode (values have yellow color).

Hope this is what you want!

Hi Berg,

Well, when you change an attribute, create a new variable, delete a variable and few others, you will need a full download..

However, if you have a CPU410 and PCS7 8.1 or above, you will be able to download in run if a block type interface changes. Its called TCiR.

But I have a good tip: When you really need to change the block type and a stop is not possible, then you can make a copy of the source, change the FB name from "R_TO_TIME" to something else and create a new FB number in the symbol table with the new name. Compile the source and exchange the old block with the new block.

Only the downside is that if you have 100instances, you need to do this 100 times