Siemens SIMATIC ET 200M Manual page 221

Glossary
DP slave
A ³ slave run on the PROFIBUS bus system with the PROFIBUS-DP protocol
and performing to the IEC 61784-1:2002 Ed1 CP 3/1 standard is referred to as a
DP slave.
DP standard
The bus protocol of the ET 200 distributed I/O system in accordance with the
IEC 61784-1:2002 Ed1 CP 3/1 standard.
Equipotential bonding
Electrical connection (equipotential bonding conductor) that brings the parts of
electrical equipment and other conductive parts to the same or approximately the
same potential in order to prevent troublesome or dangerous voltages arising
between these parts.
External power supply
Power supply for the signal and function modules and the process peripherals
connected to them.
Fiber-optic cable
Fiber-optic cables are made of glass fiber or plastic and have an extremely high
transmission rate. They are insensitive to electromagnetic interference and are
very difficult to tap.
FREEZE
This is a control command of the DP master to a group of DP slaves.
When a DP slave receives the FREEZE control command, it freezes the current
status of the inputs and transfers them cyclically to the DP master.
After each subsequent FREEZE control command, the DP slave freezes the
status of the inputs again.
The input data is not transferred from the DP slave to the DP master again
cyclically until the DP master sends the UNFREEZE control command.
Glossary-4
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Distributed I/O Device ET 200M
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