Plant changes during redundant operation - H-CiR
12.7 Permitted changes over PROFIBUS DP
CPU 410 Process Automation/CPU 410 SMART
System Manual, 05/2017, A5E31622160-AC
205
●
Always terminate both ends of PROFIBUS DP and PROFIBUS PA bus cables using
active bus terminating elements in order to ensure proper termination of the cables while
you are reconfiguring the system.
●
PROFIBUS PA bus systems should be built up using components from the SpliTConnect
product range (see interactive catalog CA01) so that separation of the lines is not
required.
Modifications to the user program and the connection configuration
The modifications to the user program and connection configuration are loaded into the
target system in redundant system state. More detailed information can be found in the
PCS
7, Configuration Manual
.
See also
Modifying the System during Operation via CiR
http://support.automation.siemens.com/WW/view/en/14044916
12.7
Permitted changes over PROFIBUS DP
How is hardware modified?
If the hardware components concerned can be unplugged or plugging in live, the hardware
modification can be carried out in the redundant system state. However, the fault-tolerant
system must be temporarily switched to solo mode as downloading a modified hardware
configuration in the redundant system state would cause the fault-tolerant system to stop. In
solo operation, the process is then controlled by only one CPU while the desired
configuration changes are made to the other CPU.
Note
You can either remove or add modules during a hardware change. If you want to alter your
fault-tolerant system by removing some modules and adding others, you will need to make
two hardware changes.
Note
Always download configuration changes to the CPU using the "Configure hardware"
function.
Synchronization link
Following all hardware changes, ensure that the synchronization link between both CPUs is
restored before you start or switch on the standby CPU. When the power supplies of the
CPUs are switched on, the IFM1F and IFM2F LEDs, which are used to indicate module
interface errors, must go out on both CPUs.