Extract the project backup (.apb, .csp, .pcd, .bin) and use a hex editor or dedicated tool:
The best "All PLC HMI Password Key Top" is never needing it. Implement these three policies: all plc hmi password key top
| | Device/Software | Default Username | Default Password | Notes/Source | | :--- | :--- | :--- | :--- | :--- | | Siemens | S7-200 SMART | (None) | Changeme_123 | This is the official initial password for this model, which is case-sensitive. | | | LOGO! 8 | (None) | LOGO | The default is the same for all functions. | | | SIMATIC HMI (Access) | (None) | User-defined: "Password 1" | For "Full Access (no protection)" and "No Access (complete protection)" levels. | | | BDA (SENTRON) | (None) | sentron | Default for the BDA device. | | Allen-Bradley (Rockwell) | 1734 Point I/O | admin | password | Both are case-sensitive. | | | MicroLogix 1100 | administrator | ml1100 | Strongly recommended to change immediately. | | | MicroLogix 1100 | guest | guest | Guest account with limited privileges. | | | MicroLogix 1400 | administrator | ml1400 | Strongly recommended to change immediately. | | | QuickPanel View | master | control | This is the administrator account. | | | GuardPLC | (Resets to default) | (Resets to default) | Resetting restores IP 192.168.0.99 and default accounts. | | Schneider Electric | Magelis HMI (Vijeo Designer) | (Varies) | (Varies) | Application download resets after too many failed login attempts. | | | MiCOM Px4x Relays | None for Level 2 | 2 (Level 2) | Setting "2" grants Level 2 access to all users without a password. | | ABB | 615 series | (Varies) | (Varies) | LHMI passwords: 4-8 chars; WHMI passwords: 9-20 chars. | | GE | P24DM/P442 | Level 1 | (blank) | No default password for Level 1. | | | P24DM/P442 | Level 2 | BBBB | Default for Level 2 access. | | | P24DM/P442 | Level 3 | AAAA | Default for Level 3 access. | | General | OIT Operator Terminal | (None) | 0000 | Common default for many HMI keypads. | | | Maple Systems HMI | (None) | 111111 | Default for factory reset function. | | Advantech | SNMP-1000, MIC-3924 | root | root | Common default for management modules. | Extract the project backup (
In this 2,500-word deep dive, we will explore the reality behind the search, how to legally recover lost passwords, the top tools for each brand, and how to prevent future lockouts. 8 | (None) | LOGO | The default
Last updated: June 2025 | Disclaimer: This article is for educational and legitimate recovery purposes only. Bypassing security controls without ownership rights is illegal.
To prevent unauthorized users from using password keys against your infrastructure, apply these cybersecurity best practices: