Siemens SIMATIC ET 200AL, System Manual

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Description
2.2 Structure of PROFIBUS networks
PROFIBUS with STEP 7 V13
24
Function Manual, 12/2014, A5E03775446-AC
2.2.1.4 M12 bus connector
Area of application
Devices with an electrical M12 interface can use the M12 bus connector for SIMATIC NET
PROFIBUS for direct connection with the SIMATIC NET PROFIBUS cables.
The M12 bus connector in degree of protection IP65 is available in the following versions:
●
with screw-type terminals
● with insulation displacement termination
● with a cable outlet of 180°
2.2.1.5 Bus terminals for RS 485 networks
Bus terminal RS 485 and bus terminal M12
A bus terminal is used for the connection of an individual PROFIBUS station with RS485
interface to the PROFIBUS bus cable.
Bus terminals in degree of protection IP20 are available in the following versions:
●
Bus terminal RS 485 with or without PG interface, transmission rate 9.6 kbps to 1.5 Mbps,
integrated terminating resistor combination (connectible), with 1.5 m and 3 m connecting
cable
● Bus terminal M12, transmission rate 9.6 kbps to 12 Mbps, integrated terminating resistor
combination with isolating function, with 1.5 m connecting cable
2.2.1.6 M12 bus terminating resistor
Terminating segment with terminating resistor
If there is a station with M12 connection system at the beginning or end of a PROFIBUS
segment, you need an M12 bus terminating resistor.
The M12 PROFIBUS connection of a device consists of an M12 socket for the infeed and an
M12 male connector to loop-through the bus signal.
This means you need one bus terminating resistor with male contacts (6GK1905-0EC00)
and with female contacts (6GK1905-0ED00) for each M12 bus cable.