Hello Experts,

I need a help in SEND_PtP block,In which i am sending data of (Array of Char length-1024 Byte) to ZEBRA printer but when i am trying to send data more than that at that time block shows error  (Error Code-8085) 

PLC Using---1215C- DC/DC/Relay

Software--TIA V15

manual (https://support.industry.siemens.com/cs/ww/en/view/59057093)

16#8085 Invalid length. Select a suitable frame length.

The following are valid (depending on the module): 1-1024/2048/4096 (Byte)

You didn't tell us which module you use.
If you have not a "HF" version or the ET 200SP module, this may be your problem: 

manual

Overview of components and receive buffer size

Each communication module has a buffer to temporarily store received frames. The table below shows the assignment of the maximum size of an individual frame as well as the size of the memory for the individual communication modules.

Module	Receive buffer size KB	Max. frame length KB	Bufferable frames
CM PtP RS232 BA	2	1	255
CM PtP RS422/485 BA	2	1	255
CM PtP RS232 HF	8	4	255
CM PtP RS422/485 HF	8	4	255
CM PtP (ET 200SP)	4	2	255

miami

 thank you Miami

manual (https://support.industry.siemens.com/cs/ww/en/view/59057093)

16#8085 Invalid length. Select a suitable frame length.

The following are valid (depending on the module): 1-1024/2048/4096 (Byte)

You didn't tell us which module you use.
If you have not a "HF" version or the ET 200SP module, this may be your problem: 

manual

Overview of components and receive buffer size

Each communication module has a buffer to temporarily store received frames. The table below shows the assignment of the maximum size of an individual frame as well as the size of the memory for the individual communication modules.

Module	Receive buffer size KB	Max. frame length KB	Bufferable frames
CM PtP RS232 BA	2	1	255
CM PtP RS422/485 BA	2	1	255
CM PtP RS232 HF	8	4	255
CM PtP RS422/485 HF	8	4	255
CM PtP (ET 200SP)	4	2	255