Siemens SIMATIC Ident System Manual page 355

M
Centerpoint of a field of a transmission window
Metal-free area
Distance/area which must be maintained between the transponder and metal in order to
prevent interference during data transfer between the transponder and read/write device.
Mobile data storage units (MDS)
See transponder
Multi-tag capability
Multi-tag capability means the ability to use several read/write devices which communicate
simultaneously with different data carriers.
Programmable logic controller (PLC)
The programmable logic controllers (PLC) of the SIMATIC S5 system consist of a central
controller, one or more CPUs, and various other modules (e.g. I/O modules).
Read/write devices (SLG)
See readers
Read/write distance
See transmission distance
Readers
Readers ensure fast, secure data transfer between mobile data storage units and higher-
level systems (PLCs, PCs, etc.). The data, energy included, are transmitted inductively
across an electromagnetic alternating field or by radio. This principle enables contact-free
data transmission, ensures high industrial compatibility and works reliably in the presence of
contamination or through non-metallic materials.
RFID systems
SIMATIC RF identification systems control and optimize material flow and production
sequences. They identify reliably, quickly and economically, use non-contact data
communication technology, and store data directly on the product. They are also resistant to
contamination.
SIMATIC RF200
System Manual, 07/2015, J31069-D0227-U001-A9-7618
Glossary
355