Technical data

Glossary
TeleService V6.1 Service Software for SIMATIC S7 and C7
Glossary-6 A5E00921336-01
Safety Function for MPI/PROFIBUS Interfaces
If you activate an online function on your programming device/personal computer
without a safety function, the interface begins to send messages. If you connect the
interface to a network at such a moment, it is disturbed briefly by the messages.
This can lead to network connections being disconnected.
A safety function is therefore normally activated at the communication drivers:
• The interface can only send messages, if messages (from other masters) have
been heard free of errors.
• If it was not possible to hear a message (free of errors), the driver outputs an
error message.
A passive station (slave) can only send data if it is prompted to do so by active
station (master). If you have connected only slaves to the programming
device/personal computer, you must therefore deactivate this safety function by
activating the "Programming device / PC is the only master on the bus" check box.
If the "Programming device / PC is the only master on the bus" check box is
deactivated and all further masters fail, communication is no longer possible from
the programming device/personal computer to the slaves.
SMS
An SMS (Short Message Service) is a message of limited length (max. of 160
characters), which can be sent via a radio network to a GSM receiver.
Transfer Speed
The transfer speed is the rate at which data are transferred on the phone line. The
transfer speed which can be reached is the main criterion for performance of a
modem. The faster the data can be transferred, the lower the phone costs are.