LINEPULS & LINECOD catalogue 2016 in English

LINECOD
Output circuits and fieldbus interfaces
RS-485 is the most commonly used transmission technology for PROFIBUS; it is simple,
easy-to-use and cost-effective. It is primarily used for tasks that require high transmission
rates. RS-485 transmission technology uses shielded twisted pair copper cables with one
conductor pair. A Profibus system that is to accommodate more than 32 stations must be
divided into several bus segments. These individual bus segments with up to 32 stations
each one are connected to each other by repeaters (also referred to as line amplifiers).
The following table shows the maximum transmission rates in relation to permissible line
length.
Baud rate [Kbit/s] 9.6 19.2 93.75 187.5 500 1500 12000
Max. cable length
1200 m
4000 ft
1200 m
4000 ft
1200 m
4000 ft
1000 m
3300 ft
400 m
1300 ft
200 m
660 ft
100 m
330 ft
Lika linear encoders with Profibus interface implement Profibus DP (Decentralized Peripherals)
communication protocol and can be set as Class 1 or Class 2 devices.
Encoder class has to be set at device configuration.
Class 1 provides the basic functionalities of DP such as:
• position readout;
• setting of the counting direction;
• setting of the preset value;
• 16-byte reduced diagnostic information.
Class 2 supports extended enhancements in addition to functionalities of Class 1:
• scaling function;
• 63-byte extended diagnostic information.
Thanks to Profibus DP, encoders can be coupled reducing costs and increasing performances;
furthermore they fulfil each configuration, parametrization and diagnostic requirement.
Among the parameters available: position readout, counting direction, scaling function,
preset value. Encoders are fitted with diagnostic LEDs and bus termination resistance.
Profibus at a glance
Number of
stations
Setting the
nodes
Setting the
baud rate
Transmission
rate
Cable length
Cable
Up to 126 Dip switches Software Up to 12Mbit/s
Up to 1200 m
4000 ft
Standard Profibus
M12 connectors
Setting the node number and the transmission rate for LIKA encoders
Modbus CANopen Profibus EtherCAT
Node number
IP address
Software
Dip switches or
software
Dip switches
Software,
automatic
Baud rate
Software
Dip switches or
software
Software -
50