Glossary
Distributed I/O system
System Manual, 09/2019, A5E03576849-AJ
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Channel group
The channels of a module are grouped together in a channel group. Certain parameters in
STEP 7 can only be assigned to channel groups, rather than to individual channels.
Channel number
Channel numbers are used to uniquely identify the inputs and outputs of a module and to
assign channel-specific diagnostic messages.
Channel-specific passivation
With this type of passivation, only the affected channel is passivated in the event of a →
channel fault. In the event of a → module fault, all channels of the → fail-safe module are
passivated.
Configuration
Systematic arrangement of the individual modules.
Configuration control
Function that enables a flexible adjustment of the actual configuration based on a configured
maximum configuration via the user program. Input, output and diagnostics addresses
remain unchanged.
Connecting to common potential
Configuring a new potential group for which a new infeed is set up for the supply voltage.
Connection plug
Physical connection between device and cable.
CPU
The CPU uses the integrated system power supply to supply the electronics of the modules
via the backplane bus. The CPU contains the operating system and executes the user
program. The user program is located on the SIMATIC memory card and is processed in the
work memory of the CPU. The PROFINET interfaces of the CPU establish an Industrial
Ethernet connection. The CPUs of the ET 200SP support operation as an IO controller, I-
device or standalone CPU.
CRC
Cyclic Redundancy Check
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