Glossary
ET 200S Distributed I/O System - Fail-Safe Modules
210 Installation and Operating Manual, 08/2008, A5E00103686-07
Availability
Availability is the probability that a system is functional at a specific point in time. Availability
can be enhanced by redundancy, for example by using multiple -> sensors at the same
measuring point.
Backplane bus
The backplane bus is a serial data bus via which the IM 151 interface module communicates
with the electronic modules/motor starters, supplying them with the required voltage. The
modules are interconnected by way of terminal modules.
Category
Category in accordance with EN 954-01.
-> Fail-safe modules can be used in safety mode up to Category 4.
Channel error
Channel-specific fault, such as a wire break or short circuit.
In channel-specific passivation, the affected channel is either automatically reintegrated or
the F-module must be removed and reinserted after the fault has been eliminated.
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 and not 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 when a -> channel fault
occurs. All channels of the -> fail-safe module are passivated when a -> module fault is
detected.
Configuring
A configuration denotes the systematic arrangement of the individual ET 200S modules (set-
up).
CRC
Cyclic Redundancy Check -> CRC signature
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