Beckhoff CX5020-0120-M310 can't read data from Siemens 1SI RS232 on ET 200s

Hi i have Beckhoff (CX5020-0120-M310) (profibus master) with TC3.1 and want communicate with
Siemens Profibus ET 200S (IM151) DPV1.

All modules works on ET200s except 1SI RS232 (6ES7138-4DF01-0AB0). When i triggered Barcode scaner
i have one bit ON on no more data from 1SI module.

on Array (0..15) of words

0.#0000000000000000
1.#0000000000000001 => this bit is ON after trigered pushbotton on scaner
2.#0000000000000000
3.#0000000000000000
..#0000000000000000
..#0000000000000000
15#0000000000000000

This Same ET200S with this same configuration i have tested with Siemens S7-300 and it works,
i can read data from Barcode scanner on the 0..31 array of byte (no WORD's like on CX5020)
Siemens have On Communication => ET200s serial interface => Function block S_RCV i use them and i
can communicate with 1SI RS232 via this block. But Twincat 3,1 dont have this block.

On ET200s i have:
1. 1SI(rs232) module (rs232 parameter is : Data - 8bit, Stop - 1 bit, Parity - NONE, Data Flow - NONE,
Interface type RS232-C )
2 DO modul
3 RTD modul
4. DI
5. RO modul


Any ideas where are problem? why can't read data from 1SI RS232?

See this manual in the section "Reference Data for Masters Other than S7-PROFIBUS"

https://support.industry.siemens.com/cs/mdm/9260793?c=15217241355&lc=en-WW