Siemens SIMATIC ET 200S Installation And Operating Manual page 176

Glossary
The connection between individual modules is established by means of the 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
This is a channel-specific error, such as a wire break or a 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, 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-Granular Passivation
In this passivation method, when a -> channel fault occurs, only the channel involved is
passivated (method available in S7 F/FH systems only). In the event of a -> module fault, all
channels of the -> fail-safe module are passivated.
Configuring
A configuration is a systematic arrangement of the individual modules of ET 200S.
Connection to Common Potential
Connection to common potential refers to the opening of a new potential group by a power
module.
This enables individual connection of encoder and load current power supplies.
CRC
Cyclic Redundancy Check -> signature
CRC signature
The validity of the process values in the safety message frame, the accuracy of the assigned
address references, and the safety-related parameters are ensured by means of a CRC
signature contained in the safety message frame.
Glossary-2
ET 200S Distributed I/O System - Fail-Safe Modules
Hardware Installation and Operating Manual, 07/2005, A5E00103686-04