Hi,

Have a look at the attached file.

I create a tag in the tag list 

When programming certain key in OP177B with WinCC Flexible 2008 SP2,this tag not appear in the available tag.

Tag: DB10DBW40

Data type:  Word

Length:        2

Why this tag not appear?

Thank you in advance.

Hello Pepsi,

the system function SetBitWhileKeyPressed requires a boolean tag. Maybe there is a system function SetBitInTagxxx the can be used to set a bit in a word tag.

Regards,

Frink

Hi,

I want to set bit 0 in this tag "DB10DBW40" when press the key.

But this tag not appear in the available selection.

Why?

Dear Frink,

You are right

When I select the Function"Set bit in the tag"

The required tag appear 

But I have 4 questions:

1-When programming the F or H keys,the system not accept the bit larger than 15 in the data word although the length is  2 Words.

and the system accept it  in LED assignment for H keys.

Why this happen?

2-When programming the  LED assignment for H keys,the system not accept the bits no. 1,3,5,7,...... in the data word

Why this happen? 

3-  <ENTER> Not supported On OP 177B, input is confirmed using the <Enter> key

How can we enter the values in this HMI?

4-Have a look at the attached file from "WinCC Flexible 2008 help" 

How can we know the PLC support Bool tags?

Thank you in advance.

Hello Pepsi,

Pepsi Cola 

1-When programming the F or H keys,the system not accept the bit larger than 15 in the data word although the length is 2 Words.

and the system accept it  in LED assignment for H keys.

Why this happen?

When the tag is of data type Word then it has 16 bits (0-15) and when it is is of data type DWord  then it has 32 bits and you can 

Pepsi Cola 

2-When programming the  LED assignment for H keys,the system not accept the bits no. 1,3,5,7,...... in the data word

Why this happen?

Never used this panels, but I guess the reason is that for the LED mapping the system uses "Bit n" and "Bit n+1". So it might be only possible to select "Bit n" with n=0/2/4/6 and automatically the next bit is part of the setting. 

Pepsi Cola 

3-  <ENTER> Not supported On OP 177B, input is confirmed using the <Enter> key

of the touch screen keyboard.

How can we enter the values in this HMI?

Can you explain more in detail, e.g. with screenshot? 

Pepsi Cola

4-Have a look at the attached file from "WinCC Flexible 2008 help" 

How can we know the PLC support Bool tags?

Good question. In general it means that it is not recommended to use the "SetBitInTag" because the HMI writes the complete tag and doesn't check whether any other bit in this tag changed the status since the tag was read (acquisition cycle). So you could loose the information of setting/resetting a bit in the tag. Actually I don't know if there is any PLC not using/supporting boolean tags but e.g. communicating with an AB, I guess, it is not possible to read/write boolean tags from at least a Basic Panel (TIA).

Regards,

Frink

Hi,

Have a look at the attached file.

Hi,

OP17 was only operable by the keys and therefor had on key for <enter>. OP177B has a touch screen and values are entered by use of the onscreen keyboard - after writing values to input field you have to acknowledge the values with the <enter> button of the onscreen keyboard.

Regards,

Frink

Dear Frink, 

Thank you very much for your support.