Stop Operating State - Siemens SIMATIC S7-1500 System Manual

Commissioning
11.4 Operating and system states
Figure 11-7 Setting the startup behavior
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11.4.3

STOP operating state

Response
The CPU does not execute the user program in the STOP operating state.
All outputs are disabled or respond as configured for the given module if both CPUs are in
STOP operating state: They provide a configured substitute value or retain the last value
output and thus hold the controlled process in a safe operating state.
Points to note
The backup CPU establishes no connections to the IO devices in the STOP operating state.
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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
switches to RUN.
If the distributed I/O is not ready for operation within the configuration time, the startup
behavior of the CPU depends on the hardware compatibility setting.
S7-1500R/H redundant system
System Manual, 11/2022, A5E41814787-AD