Protection
11.4 Configuring access protection for the CPU
S7-1500R/H redundant system
350 System Manual, 01/2024, A5E41814787-AF
11.3.4 Information about compatibility
In the following sections, you will find information on the behavior of the CPUs with the local
user administration, e.g. when replacing modules in STEP 7 and for further use of projects
and programs without local user administration.
Replacement part scenario
If you replace a CPU with a firmware version < V3.1 with a CPU with a firmware version V3.1
or higher, the program stored on the memory card runs like the original CPU.
Replace CPU (upgrade)
If you replace a CPU (FW < V3.1) with a current CPU (FW V3.1 or higher) in the TIA Portal, this
has the following effects on the configured user data:
• The "Legacy access control via access levels" option is set for access protection.
Replace CPU (downgrade)
If you replace a CPU (as of FW V3.1) with a previous CPU (< FW V3.1) in the TIA Portal, this
has the following effects on the configured user data:
• The local user administration is no longer available.
• It is no longer possible for users to change passwords during runtime (via the Web API of
the Web server).
11.4 Configuring access protection for the CPU
Introduction
A description of how to use the individual access levels of the CPUs is provided below. The
description applies to R/H-CPUs up to firmware version V3.0.
In later firmware versions, you use the local user management (Page 342) in the "Users and
roles" editor in the project tree. The access levels are represented there by function rights of
the same name, which you assign to individual users via roles.
The S7-1500R/H redundant system has four or five different access levels to limit access to
specific functions.
By setting up access levels and passwords, you limit the functions and memory areas that are
accessible without a password. The individual access levels and corresponding passwords are
specified in the object properties of the CPUs.
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