Siemens SIMATIC Ident System Manual page 282

Glossary
Dynamic mode
In dynamic mode, the data carrier moves past the read/write device at a traversing rate
which depends on the configuration. Various checking mechanisms (listen-in check, CRC,
ECC, etc.) ensure error-free data transfer even under extreme environmental conditions. A
serial connection (up to 1000 m) is used to connect the read/write device directly to an
interface module, PC, or any other system.
Electromagnetic compatibility
Electromagnetic compatibility is the ability of an electrical or electronic device to operate
satisfactorily in an electromagnetic environment without affecting or interfering with the
environment over and above certain limits.
EMC Directive
Guidelines for electromagnetic compatibility This guideline relates to any electrical or
electronic equipment, plant or system containing electric or electronic components.
Equipotential bonding
Potential differences between different parts of a plant can arise due to the different design
of the plant components and different voltage levels. It is necessary to compensate for these
differences by equipotential bonding: this is done by combining the equipotential bonding
conductors of power components and non-power components on a centralized equalizing
conductor.
ESD Directive
Directive for handling ESDs.
Frequency hopping
Frequency hopping technique Automatic search for free channels.
In frequency hopping, data packets are transferred between the communication partners on
constantly changing carrier frequencies. This makes it possible to react to interference from
devices transmitting signals in the same frequency range. If an attempt to send a data
packet is unsuccessful, the packet can be transmitted again on a different carrier frequency.
Interface modules (ASM)
See communication modules
Limit distance
The limit distance (S
read/write device and the transponder at which transmission still functions under normal
conditions.
282
) is the maximum clear distance between the upper surface of the
g
System Manual, 09/2013, J31069-D0227-U001-A8-7618
SIMATIC RF200