Commissioning
12.4 Operating and system states
S7-1500R/H redundant system
System Manual, 01/2024, A5E41814787-AF
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Aborting or not running startup
If errors occur during startup, the CPU aborts STARTUP and returns to the STOP operating
state.
The CPU does not perform STARTUP under the following conditions:
• You have not inserted a SIMATIC memory card or an invalid one is inserted.
• You have not downloaded a hardware configuration to the CPU.
Configuring startup behavior
You configure the behavior of the CPU in STEP 7 in the "Startup" group of the CPU properties.
Proceed as follows to set the startup behavior:
1. Select the CPU in the device view of the STEP 7 hardware network editor.
2. In the properties, select the "Startup" area.
Figure 12-7 Setting the startup behavior
Sets the startup type after POWER ON
Defines the startup behavior for the event that a module in a slot does not correspond to
the configured module. This parameter applies to the CPU and to all the modules for
which no other setting has been selected.
Startup CPU only if compatible: In this setting, a module in a configured slot must be
compatible with the configured module. Compatible means that the module matches
the configured module in terms of:
– The number of inputs and outputs
– The electrical and functional properties
Startup CPU even if mismatch: With this setting, the CPU starts up irrespective of the
type of module inserted.
Specifies a maximum period (default: 60 000 ms) in which the distributed I/O must be
ready for operation.
If the distributed I/O is ready for operation within the configuration time, the CPU switch-
es to RUN.
If the central and distributed I/O is not ready for operation within the configuration time,
the startup behavior of the CPU depends on the setting of the hardware compatibility.
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