Operator controls and operating modes of the CPU 410-5H
7.4 Performing a memory reset
CPU 410-5H Process Automation
120 System Manual, 09/2014, A5E31622160-AB
Performing a memory reset
Memory reset process in the CPU
You can perform a memory reset of the CPU from the programming device. During a
memory reset, the following process occurs on the CPU:
● The CPU deletes the entire user program in the main memory.
● The CPU deletes the user program from the load memory.
● The CPU deletes all counters, bit memories, and timers, but not the time of day.
● The CPU tests its hardware.
● The CPU sets its parameters to default settings.
The LEDs behave as following during the memory reset:
1. The STOP LED flashes for about 1-2 seconds at 2 Hz.
2. All LEDs light up for approximately 10 seconds.
3. The STOP LED flashes for about 40 seconds at 2 Hz.
4. The STOP LED lights up permanently.
Data retained after a memory reset...
The following values are retained after a memory reset:
● The content of the diagnostic buffer
● The baud rate of the DP interface
● The parameters of the PN interfaces
– Name (NameOfStation)
– IP address of CPU
– Subnet mask
– Static SNMP parameters
● The time of day
● The status and value of the operating hours counter
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