Siemens SIMATIC S7-1500 System Manual page 154

Commissioning
10.5 Operating modes of the CPU
Setting the startup behavior
To set the startup behavior, follow these steps:
1. Select the CPU in the device view of the STEP 7 hardware network editor.
2. In the properties under "General" select the "Startup" area.
Figure 10-2
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Setting the startup behavior
Sets the startup type after POWER ON
Defines the startup behavior for the case where 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 was selected.
• Startup CPU only if compatible: In this setting a module on a configured slot has to be
compatible with the configured module. Compatible means that the module matches
the number of inputs and output and must match with respect to its electrical and
functional properties.
• Startup CPU even if mismatch: At this setting the CPU starts up irrespective of the
type of module plugged.
For locally used modules you can configure the hardware compatibility in the parameter
"Comparison preset to actual module" individually for each slot. When you change the
setting of the hardware compatibility for a module, the setting made at the CPU does not
apply for this module.
Specifies a maximum period (default: 60000 ms) in which the central and distributed I/O
must be ready for operation. The communications modules (CM/CP) are supplied with
voltage and communication parameters during the CPU startup. This parameter
assignment time grants a period within which the I/O modules connected to the
communication module (CM/CP) must be operationally ready.
The CPU goes into RUN mode when the central and the distributed I/O is operationally
ready within the parameter assignment time.
If the central and distributed I/O is not ready for operation within the configuration time,
the startup characteristics of the CPU depends on the setting of the hardware
compatibility.
Automation system
System Manual, 12/2014, A5E03461182-AC