Siemens SIMATIC S5 Manual page 311

Glossary
Export
External power
supply
Floating
FREEZE
Gap factor
Ground electrode
Grounding
Group
Glossary-4
A COM ET 200 Windows command for saving data on a memory card or in a
binary file.
Power supply unit for I/O modules.
On a floating I/O module the reference potentials of the control and load
circuits are galvanically isolated from each other. The input and output
circuits are not grouped, in other words they have no common reference
potential (1-to-1 grouping). Not to be confused with "isolated".
A control command issued by the DP master to a group of DP standard
slaves.
When it receives the FREEZE control command, the DP slave freezes the
current state of the inputs and transfers them cyclically to the DP master.
The DP standard slave freezes the status of the inputs every time it receives a
FREEZE command.
The DP standard slave does not transfer the data cyclically to the DP master
until the DP master sends the UNFREEZE control command.
The FREEZE command requires that the DP standard slaves be assigned to a
group in COM ET 200 Windows. ET 200 supports the FB IM308C for the
FREEZE command.
Gap-update factor. The distance between the own station number of the DP
master and the next station number is known as the gap. The gap update
factor, in turn, indicates the number of token runs that must be performed
before the DP master checks whether there is another DP master in the gap.
If, for example, the gap updating factor is 3, each DP master checks after 3
token runs whether there is another DP master between its own station
number and that of the next DP master.
One or mode conductive parts making good contact with the ground.
Connecting an electrically conductive part to the ground electrode by means
of a grounding system.
You must assign the DP slaves to groups and send the FREEZE and SYNC
control commands to the groups.
Multiple DP slaves can be assigned to a group. A given DP slave can be
assigned to more than one group, but can belong to only one
system.
master
ET 200 Distributed I/O System
EWA 4NEB 780 6000-02a