S5-135U CPU 928Password for Machine Data on HMI is stored in this program

Dear Experts

The attachment file has S5 135U Programs. i want to find out a password stored in DATEN@ST.S5D or 260397ST.S5D. This password is used in HMI for entering Machine Data for Motor Parameter.

Actually my program was wash out due to Battery problem. when i download 260397ST.S5D this file my password for machine data on HMI is 0000 but after downloaing DATEN@ST.S5D DB blocks password is changed. now i want to know where the password is stored in these file. Password is 4 digit numeric code. it is confirmed. but what is the password i dont know. can anybody help me. how can i find password in DB blocks. please help me or guide me to find out the stored password.

Dear Fritz

Thank you so much

u r right sir there is 4 access level i will try these values and then inform u

sir can u tell me how u find this information.it will be very helpful for me in future. sir please tell me step by step that how u find this.what is the procedure to understand the program.

Special request

Sir can u tell me how i can understand a whole program when i did not write the program. as i send u the program and u have successfuly find the password location in the program and also u told me that there is 4 access level how u find this please sir help me i want to understand whole program.actually there is 4  section of machine i want to know from start of machine and all program flow..please help me

Dear Sir

Thanks for your reply. how u guess that there is 4 access level. and can u tell me how u find out that where the startup routine start. how can i understand the whole program?? can u tell me some hints or idea to start understanding the whole program. can u send me the link for understanding the OB description and STL all command or any kind of idea to understand the program??

Dear Fritz below mention are the values stored in 

DB10

DW42=3330

DW43=3031

DW44=3330

DW45=3032

DW46=3330

DW47=3033

DW48=3235

I tried these values on HMI but it is again saying wrong password. now tell me what i do.... please help me what is the actual password. i can not reset the plc because if i will reset the machine the machine motor parameter will go to their default values. and may be create some problem. so tell me the password.

Dear Sir

PROBLEM SOLVED BY MR FRITZ .

Thanks for your reply. thank you so much. now i find out password and is 2503. u r really an expert .

now please give me idea how u find out the location of password and also that it is stored in ASCII Character. please sir give me some idea it is so helpful for my job and future.  provide me some tips that u used to reached the password location from a large program. please sir must give some tips to reach at your level of understanding.

Regards

Dear Fritz 

Please just tell me how u decide that FB251 DB10 DW40-49 Contains password information . what is the information stored in a program which tells u that here is the 4 acces level password stored. sir please help me sir just give an idea then i i will try to understand the other program according to your tip. pleaaassssseee Mr. Fritz help me.