[?]: Convert 38bit bin-value to dec value

[Apollo11]

Hi!
I have a problem how to convert a 38-bit binary value to a dec-value.

The PLC is a Siemens 400-cpu and have a 32-bit accumulator, so the solution must use 2 DoubleInteger variables to show the dec value.

Do anyone have a solution or tip how to solve this problem.

Who will be the first to solve my problem?

//Apollo11

[Homeroid_BL]

More precisely, please.
38-bit or 32-bit or 64-bit binary?

[Apollo11]

A RFID-reader sends a serialnumber in 38-bit Binary-code this value should be converted to datatype=dec in the PLC-system.

In some way I need to find a solution who can work with bigger value than 32-bit.

Because the Siemens-system has only a 32-bit accumulator to work with.

[dehell]

Hi,
Could you explain how and where the data are send to the Siemens PLC?

[Apollo11]

OK!
The RFID-reader sends the data over a Profibus-connection.
The data are 12-byte long in binary-code. In this data-area you can read out following data.
Binarycode from left to right.
Codetype = bit 1-8 bit (8-bit long) convert to 0-255 dec, no problem.
FilterType = bit 9-11 (3-bit long) convert to 0-7 dec, no problem.
PartionTable = bit 12-14 (3-bit long) convert to 0-7 dec, no problem.
CompanyPrefix = bit 15-28 (14-bit long) convert to 0-16384 dec, no problem.
SerialNo = bit 29-66 (38-bit long) this value is bigger than 32-bit and that is my problem because the PLC-system is built to handle max 32-bit each programaccess.

[benthouse]

which type of RFID reader is used?
I'm looking for readers which can be conneced to Profibus-DP directly.

For me it's only necessary to identifiactie the RFID Taf (unique) number in a PLC program.

Waiting for your answer....

Regards,
Benthouse

[Apollo11]

Sorry for the late answer.
The RFID reader from a company called Vilant (www.vilant.com).
You need for now a gateway between the reader and your profibus-system.
Everything can be deliverd by Vilant.

//Apollo11

[Coyote]

Change the way of thinking, RFID key for sure doesn't use a CPU that is better than Siemens CPU4xx, so you can use more than one byte, dint, ... array of bits,..

[dehell]

Hi,
Another way to solve your problem : use string (convert byte area into string)
Then, use SCL for programming with string , it is more easy...