Siemens SIMATIC S7 Product Information page 23

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Change and load the user program (see Section 10.3.2 for PCS7 or Section10.5.2 for
STEP7)
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Stop the standby CPU (see Section 10.3.3 for PCS7 or Section 10.5.3 for STEP7)
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Download the new hardware configuration to the standby CPU (see Section 10.3.4 for
PCS7 or Section 10.5.4 for STEP7)
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Switch off the power supply to the standby subsystem
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Remove the IM460 and the external DP master interface
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Switch on the power supply to the standby subsystem again
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Switch to the CPU with a modified configuration (see Section 10.3.5 for PCS7 or Section
10.5.5 for STEP7)
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Transition to redundant system mode (see Section 10.3.6 for PCS7 or 10.5.6 for STEP7)
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STEP7 only: Change and load organization blocks (see Section 10.5.8)
Removing Interface Modules in Case of the Master and Standby Subsystems
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Change the hardware configuration offline (see Section 10.3.1 for PCS7 or Section 10.5.1
for STEP7)
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Change and load the user program (see Section 10.3.2 for PCS7 or Section10.5.2 for
STEP7)
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Stop the standby CPU (see Section 10.3.3 for PCS7 or Section 10.5.3 for STEP7)
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Download the new hardware configuration to the standby CPU (see Section 10.3.4 for
PCS7 or Section 10.5.4 for STEP7)
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Switch off the power supply to the standby subsystem
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Remove the external DP master interface
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Switch on the power supply to the standby subsystem again
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Switch to the CPU with a modified configuration (see Section 10.3.5 for PCS7 or
Section 10.5.5 for STEP7)
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Switch off the power supply to the standby subsystem
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Remove the external DP master interface
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Switch on the power supply to the standby subsystem again
A5E00130864-03
CPU 417-4H
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