It's a level 4 code! Reading and writing are prohibited, and you cannot upload programs in your plc whether you know the password or not. Cracking this kind of encrypted plc does have some difficulty. Can try
1. Burn the plc24c chip to be cracked and read out the 4-level encrypted bin file for saving.
2 Install and run the \"hexworkshop\" software, open the bin file of level 4, change the password level (226cn is a5f7, 224cn is 5ebf) level 04 to 03 and save it, then read the password of the bin file with the \"s7-200 dismantling decryption software\".