Operating Instructions Chapter 12
DME5000
8009813/ZJV1/2017-05 © SICK AG • Germany • Subject to change without notice 119
12 Terms
12.1 PROFIBUS
®
All devices are connected in a bus structure (line). A segment can contain up to 32
components (master or slaves).
At the beginning and end of each segment, the bus is terminated by an active bus
terminator. Interference-free operation requires that the two bus terminators are
constantly supplied with power. The bus terminator of the DME is not internally
implemented. A supply voltage for the bus terminator is available at the bus output plug.
This 5 V supply voltage is galvanically sepa-rate from the DME supply voltage. The 5 V
supply voltage can be charged with 100 mA and may be used for optical coupling
modules.
Terminator for bus terminator: See section 9.2 "Accessories".
If there are more than 32 devices, repeaters must be used to connect the bus segments.
The max. cable length depends on the transmission speed; see table 2.
The indicated cable length can be increased by using repeaters. We recommend not using
more than 3 repeaters in series. The DME supports all transmission speeds listed in table
2 and automatically adjusts to the bus master baud rate when starting up.
Baud rate (Bit/s) 9.6 K 19.2 K 45.45 K 93.75 K 187.5 K
Range /Segment (m) 1200 1200 1200 1200 600
Baud rate (Bit/s) 500 K 1.5 M 3 M 6 M 12 M
Range /Segment (m) 200 200 100 100 100
12.2 RS-422
The RS-422 standard meets the requirements to quick, transfer-safe data transmission.
This interface is intended for serial data transfer in the full duplex procedure with a
transmission rate up to 10 MBaud and a cable length of 1000 m (DIN 66259, part 3).
The interface is operated with a data channel for transmission (T) and a data channel for
reception (R). The high transfer safety is achieved by assessment of the difference voltage
between each twisted-pair wire.
Tab. 2: Range depending on
transmission speed
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