Application planning
5.2 System and load power supply
Automation system
120 System Manual, 01/2023, A5E03461182-AK
• The parameter "Startup > Comparison preset to actual module" must be set to the value
"Startup CPU only if compatible" during configuration of the PS 60W 24/48/60VDC HF.
Reason: The retentivity of the entire CPU work memory (data) is only guaranteed when
the PS 60W 24/48/60VDC HF is inserted.
When you insert the PS 60W 24/48/60VDC HF, STEP 7 automatically sets the parameter.
Figure 5-11 Startup of PS 60W 24/48/60VDC HF
Other power segments in the configuration
60W 24/48/60VDC HF must only be inserted to the left of the CPU / interface module.
Use a different system power supply (PS) for other power segments in the configuration to
the right of the CPU / interface module.
Missing diagnostics for the PS 60W 24/48/60VDC HF
In case of POWER OFF, saving the extended retentive data is most important. The CPU as of
FW V2.1.0 and higher does no longer output the following diagnostics of the PS 60W
24/48/60VDC HF:
• Supply voltage fault
• Switch position Off
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