Hello, everyone

I'm very new to programming siemens equipment and have a basic question: I'm manipulating the individual bits of an integer for status bits etc, and would like to label these bits individually. Is this possible?

Thanks,

Mark J

MJackson

Hello, everyone

I'm very new to programming siemens equipment and have a basic question: I'm manipulating the individual bits of an integer for status bits etc, and would like to label these bits individually. Is this possible?

Thanks,

Mark J

To add some information to what Juergen has already provided, you can assign a word of global memories for Status word.In this case you can define a name for each bit based on their position in status word.It is accessible with contact and assign to read or write to the memory and manipulate the status word with "L STW" and "T STW".For S7-300/400, you can check the following status bit and their position in status word via online manual of TIA Portal.

	accumulator 1 after L STW
Bit number	31-9	8	7	6	5	4	3	2	1	0
Content	0	BR	CC 1	CC 0	OV	OS	OR	STA	RLO	/FC

I hope this helps,
Hamid Hosseini

MJackson

Thanks, that does help; but it's not exactly what I'm looking for. To give an example using another controls platform, we'll say we have a dint called "motorstatus" In motorstatus you have motorstatus.0, motorstatus.1 etc. I would like to add individual descritpions to each bit, so that I would see the following in a program rung:

Motor Running

motorstatus.0

----[ ]------

thanks

!> Visually demo: slicing vs overlay on bit level

MJackson

Correct, I'm using the "slicing" method. What I need to know is how do I add an individual descriptor for each of the sliced bits. For example I have motorstatus.x0 and I want to document that the .x0 bit is the overtemp status bit and have that description show up in the ladder logic.

That means, you know how to address the bits

But you like to give any bit its own name (symbolic name).

I prefer to do so by using a PLC datatype (UDT).
Inside, there is a structure (the word) defined as 16 Bit.

The structure itself and any bit so gets its own name.

The datatype can be used to define a Word inside a Datablock.