Siemens Simatic ET 200S Operating Instructions Manual page 319

DP slave
A → slave, which is operated with the PROFIBUS DB protocol and acts according to the
Norm IEC 61784-1:2002 Ed1 CP 3/1, is known as a DP slave.
DP standard
DP standard is the bus protocol of the ET 200 distributed I/O system according to the IEC
61784-1:2002 Ed1 CP 3/1 standard.
Electronic module
Electronic modules make inputs and outputs available for process signals. There are digital
and analog electronic modules.
Equipotential Bonding
Electrical connection (equipotential bonding conductor) that brings the conductive 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.
ET 200
The ET 200 distributed IO system with the PROFIBUS DP protocol enables distributed IO
devices to be connected to a CPU or an appropriate DP master. ET 200 is distinguished by
fast response times, since only few data (bytes) are transferred.
ET 200 is based on the IEC 61784-1:2002 Ed1 CP 3/1 standard.
The ET 200 works on the master/slave principle. A DP master can be for example the
master switch-on system IM308-C or the CPU, 315-2 DP.
DP slaves can be the distributed IO system ET 200M, ET 200X, ET 200L, ET 200S or DP
slaves from Siemens or other manufacturers.
Firmware update
Updating the firmware of the interface module
After (compatible) extensions of functions of improvements to performance, the interface
module can be updated to the most recent firmware version.
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 new 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.
ET 200S
Operating Instructions, 12/2005, A5E00515771-03
Glossary
Glossary-3