Siemens SIMATIC CPU 410 System Manual page 38

Configuration of the CPU 410
3.1 Operator controls and indicators on the CPU 410
Rear of the CPU 410
Setting the rack number
Use the switch on the rear panel of the CPU to set the rack number. The switch has two
positions: 1 (up) and 0 (down). One CPU is allocated rack number 0, and the partner CPU is
assigned rack number 1. The default setting of all CPUs is rack number 0.
Slot for system expansion card
The back of the CPU has a slot in which you insert the system expansion card (SEC) before
commissioning the CPU. The SEC contains information that specifies the performance class
of the CPU in terms of the amount of POs it supports. The SEC is an essential part of the
CPU hardware. The CPU cannot be operated without an SEC. If an SEC is not detected, the
corresponding CPU goes to STOP and requests a memory reset. "STOP by CPU memory
management" is also entered in the diagnostics buffer.
You need a small screwdriver to remove the SEC. Place the screwdriver at the top of the
SEC slot and lift out the SEC with the screwdriver.
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CPU 410 Process Automation/CPU 410 SMART
System Manual, 05/2017, A5E31622160-AC