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Pulse Distributor For Splitting Speed Encoder Signal (option G70); Optical Bus Terminal (obt) For Profibus (option G71); Indicator Lamps In The Cabinet Door (option K20); Display Instruments In The Cabinet Door For Voltage, Current, Speed, And Output Plus Indicator Lamps (option K21) - Siemens SINAMICS SM120 Operating Instructions Manual

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3.4 Options

Pulse distributor for splitting speed encoder signal (option G70)

This pulse distributor is capable of splitting the encoder signal. This possibility is used, for
example, when speed list values from an HTL incremental encoder are required at various
points for measured-value acquisition and processing. The pulse distributor converts the HTL
incremental encoder signals to two separate RS422 signal outputs. The inputs are electrically
isolated from the outputs. The connection is made by means of 8-pin terminal blocks.

Optical bus terminal (OBT) for PROFIBUS (option G71)

PROFIBUS OBT is a network component for use in optical PROFIBUS DP fieldbus networks.
The individual bus nodes are connected using two-phase plastic fiber-optic cables. This also
provides an automatic isolation. Potential differences in large-scale plants do not have any
influences. The OBT has the following interfaces:
● Channel 1 is an electrical RS485 interface provided as a 9-pin SUB-D socket. This interface
● Channels 2 and 3 are the optical interface. These take the form of a duplex socket and can

Indicator lamps in the cabinet door (option K20)

This option provides four lights in the cabinet door which indicate the operating status of the
● Fault (red)
● Alarm (yellow)
● Operating (green)
● Ready for operation (white)
Display instruments in the cabinet door for voltage, current, speed, and output
plus indicator lamps (option K21)
Analog display instruments that display process variables as % are integrated in the cabinet
● Voltage
● Current
● Speed
● Power
option K21 contains option K20.
establishes the connection to the drive control.
be used to provide a connection to higher-level control systems.
Operating Instructions 07/2015


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