Glossary - Siemens SIMATIC S7-300 Reference Manual
Programmable logic controllers module data
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Glossary
Address
An address denotes a specific operand or address area; examples of this are:
input I 12.1; memory word MW 25; data block DB 3.
Aggregate current→
Sum of the currents of all output channels on a digital output module.
Backplane bus →
→ The backplane bus is a serial data bus that is used by the modules to com-
municate with each other and to supply them with the voltage they require. The
interconnection of the modules is established by the bus connector.
Basic conversion time
Time for the actual encoding of a channel (integration time) plus the required
times for the internal control; i. e. after this time a channel is completely pro-
cessed.
Basic error limit
The basic error limit is the operational limit at 25 °C, referred to the rated range
of the analog module.
Basic response time
Time which an analog input/output module requires for a cycle if all channels are
released; it corresponds to the "number of all channels x basic conversion time".
Bus
A bus is a transmission medium that interconnects several nodes. Data transmis-
sion can be serial or parallel, and be performed over electric conductors or fiber-
optic cables.
Bus segment
A bus segment is a self-contained section of a serial bus system. Bus segments
are interconnected by means of → repeaters.
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
Glossary-1
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