9 Appendix
9.3 Glossary
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9.3
Glossary
Acknowledge
Acknowledgment of a signal received.
Active metal component
Conductor or conducting component that is electrically live during operation.
Address
Identification number of, e.g. a memory position, a system or a module within a network.
Addressing
Allocation or setting of an address, e. g. for a module in a network.
ARP
Used to definitely allocate the hardware addresses (MAC-IDs) assigned worldwide to the IP addresses
of the network clients via internal tables.
Analog
Infinitely variable value, e. g. voltage. The value of an analog signal can take on any value, within certain
limits.
Automation device
A device connected to a technical process with inputs and outputs for control. Programmable logic
controllers (PLC) are a special group of automation devices.
Baud
Baud is a measuring unit for the transmission speed of data. 1 Baud corresponds to the transmission of
one step per second. If one bit is transitted per step, the baud rate is identical to the transmission rate
in bit per second (bit/s).
Baud rate
See „Baud”.
Bidirectional
Working in both directions.
Bonding strap
Flexible conductor, normally braided, that joins inactive components, e. g. the door of a switchgear
cabinet to the cabinet main body.
Bus
Bus system for data exchange, e. g. between CPU, memory and I/O levels. A bus can consist of several
parallel cables for data transmission, addressing, control and power supply.
Bus cycle time
Time required for a master to serve all slaves or stations in a bus system, i. e. reading inputs and writing
outputs.
Bus line
Smallest unit connected to a bus, consisting of a PLC, a coupling element for modules on the bus and a
module.
Bus system
All units which communicate with one another via a bus.
