Project Tree - Siemens SIMATIC S7-1500 System Manual

Time information RDHT: Redundancy Data Hold Time. RDHT indicates the time duration, how
long the outputs of an IO device are not updated during AR switching before the IO device
fails.
Time information MTOT: Maximum Take over Time. MTOT indicates the time duration how
long the inputs of an IO device are not updated during AR switching before the IO device
fails.
Valid values for RDHT and MTOT are only displayed after you have compiled the STEP 7
project. If you change the hardware configuration afterwards, you have to recompile the
project. After the compile STEP 7 shows valid values again.
For more information, refer to the following entry on the Internet
(https://support.industry.siemens.com/cs/ww/en/view/93839056) and in the SIMATIC Safety -
Configuring and Programming
(https://support.industry.siemens.com/cs/ww/en/view/54110126) programming and
operating manual.
8.7

Project tree

Structure of the project tree
In the project tree, STEP 7 creates the project tree for the CPUs. The project tree has a tree
structure and contains all elements and editors of the project.
Table 8-2 Structure of the project tree
S7-1500R/H redundant system
System Manual, 11/2022, A5E41814787-AD
Below the H system, you will find the device configuration
and diagnostic options that apply to the system as a whole.
The CPU displayed in the upper section of the project tree
has the redundancy ID "1". The properties of the CPU are dis­
played below it.
This section also contains other properties of the redundant
system, the user program and other system-related project
items.
With the HF-CPUs, the Safety Administration Editor is located
in the top CPU.
The IO devices assigned to the CPU are listed under "Distrib­
uted I/O".
Configuration
8.7 Project tree
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