Stop Operating State; Syncup Operating State - Siemens Simatic S7-1500R System Manual

9.4.3

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.
The primary CPU establishes connections to the IO devices in the STOP operating state.
The primary CPU activates the system IP address even in the STOP operating state if the
system IP address has been configured.
If both CPUs are in STOP and you download a configuration to one CPU, please note the
following:
● The CPU to which you have downloaded the configuration must be started first to
become/remain the primary CPU.
● Downloading to the primary CPU configures the connected IO devices in line with the
downloaded hardware configuration, even in STOP operating state.
9.4.4

SYNCUP operating state

SYNCUP operating state (only in the backup CPU)
In the SYNCUP operating state, the operating system synchronizes the backup CPU with the
primary CPU. The primary CPU is in the RUN-Syncup operating state and controls the
process.
Unlike the primary CPU, the backup CPU does not go through the STARTUP operating
state.
You can find more information in the section SYNCUP system state (Page 205).
Points to note
You have only limited access to online functions during SYNCUP. You can find more
information in the section Test functions (Page 282).
S7-1500R/H redundant system
System Manual, 10/2018, A5E41814787-AA
Commissioning
9.4 Operating and system states
203