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Operator controls and operating modes of the CPU 410-5H
7.1 Operating modes of the CPU 410-5H
Startup of the standby CPU
The standby CPU startup routine does not call an OB 100 or OB 102.
The standby CPU checks and assigns parameters for the following:
● its assigned one-sided I/O devices
Special features at startup
During a Power On with battery backup of a CPU 410 with large configurations containing
many CPs and/or external DP masters, it may take up to 2 minutes until a requested warm
restart is executed. During this time, the LEDs on the CPU light up successively as follows:
1. All LEDs light up
2. The STOP LED flashes for about 75 seconds as it does during a memory reset
3. The RUN and STOP LEDs flash for about 2 seconds
4. The RUN LED flashes briefly 2 to 3 times
5. The STOP LED lights up for about 25 seconds
6. The RUN LED starts flashing again.
This begins the start up.
Additional information
For detailed information on STARTUP operating state, refer to Manual
STEP 7
7.1.4
HOLD mode
The HOLD mode is for test purposes. You need to have set respective breakpoints in the
user program for this purpose. It can only be reached from the RUN mode.
Special features in redundant mode
The HOLD mode can only be reached in redundant operation from STARTUP mode and
from the RUN in single mode. It is not possible to set breakpoints when the fault-tolerant
system is in redundant system mode. Link-up and update operations are not available while
the CPU is in HOLD mode; the standby CPU remains in STOP and outputs a diagnostics
message.
7.1.5
LINK-UP and UPDATE modes
The master CPU checks and updates the memory content of the standby CPU before the
fault-tolerant system assumes redundant system mode. This is implemented in two
successive phases: link-up and update.
94
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Programming with
CPU 410-5H Process Automation/CPU 410 SMART
System Manual, 10/2013, A5E32631667-AA
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