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When software communication is blocked by strict security settings, you can use a physical MicroSD card to reset the CPU to its factory default state. MicroSD Card Requirements:
This method works for all S7-200 SMART CPUs that have a Micro SD card slot. To use it, you'll need a Micro SDHC card with a storage capacity of 4 GB, 8 GB, or 16 GB—cards with 2 GB or 32 GB are not supported. For newer V3 CPUs, microSD/microSDHC/microSDXC cards in the 4 GB to 128 GB range are compatible.
The Siemens S7-200 SMART series is a widely used, cost-effective programmable logic controller (PLC) tailored for small-to-medium automation tasks. However, a common challenge faced by engineers and maintenance personnel is encountering a password-protected CPU, especially when taking over a project from a previous vendor.
Before proceeding with any method that bypasses security, it's essential to understand the legal and ethical context. Bypassing a password is a serious action, not a routine maintenance task.
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When the (Maintenance) indicator flashes, the reset is complete.
: Use a PC to place specific system files (often provided in the S7-200 SMART System Manual ) onto a Micro SDHC card.
Save the file and insert the MicroSD card into the slot on the front face of the S7-200 SMART CPU.
You must use the software clear method via RS485 using a USB‑PPI cable. Connect STEP 7‑Micro/WIN SMART to the CPU, navigate to PLC → Clear , check both boxes, and power cycle within 60 seconds. When software communication is blocked by strict security
Open STEP 7‑Micro/WIN SMART and establish communication with your S7‑200 SMART CPU via Ethernet or RS485 cable.
: This is particularly useful for units stuck in "Level 4" protection where standard communication might be restricted. 3. Using the "WIPEOUT.exe" Utility
Forgetting the password on your S7-200 SMART PLC is frustrating, but it's almost always solvable. The official Micro SD card reset is your most reliable and safest option, as it works on all CPU versions and is a legitimate procedure for the equipment owner. The software-based "Forgot Password" function is a convenient alternative, provided you have a compatible firmware version.
Power off the PLC, insert the card, and power it back on. The CPU will reset to defaults, removing the password. Wipeout Utility : Siemens provides a standalone Wipeout.exe For newer V3 CPUs, microSD/microSDHC/microSDXC cards in the
: Confirm the operation and power cycle the PLC within 60 seconds to finalize the memory clearing sequence. Method 2: Hardware Reset via Micro SD Card
Never deploy code changes to a live PLC without saving a timestamped project backup ( .smart file) to a secure network share or version-control system (e.g., Git or Assetic).
Confirm the action. The PLC will transition to STOP mode, wipe the memory, and remove the password restriction.
