ITR SEM SC11, User Manual And Technical Documentation, Page: 8 / 21

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SEM SB11 3.1.
Expansion module SEM SB11 acts as a RS-485 converter for binary signals. It provides an interface for
the exchange of information between the module SEM SC11 and the telemechanics driver
or increases the functionality of the driver for managing the switching apparatus by additional binary
inputs and outputs.
Fig. 3.1. View of the panel of SEM SB11
Characteristics and functionality of SEM SB11 :

2 binary inputs for controlling (remotely) switching devices from the telemechanics,

10 transistor DC 24 V binary outputs designed to transmit the operating status of switching devices to
the telemechanics,

RS-485 link for communication with the SEM SB11 device (MODBUS-RTU protocol),

self-monitoring functions (STATUS led)
Table 3.1. Meaning of predefined diodes
Name Colour Description
POWER green
steady light – indicates correct supply voltages
no light – indicates incorrect supply voltages.
STATUS yellow
steady light – no transmissions from the SEM SC11 device
intermittent light – indicates correct operation of the device
no light – a failure has been detected by the self-control algorithm