The TU847 can be placed directly after the Profibus DP master to convert a single-cable bus to a redundant bus, or in the slave to convert a redundant bus to a non-redundant cable, with optical isolation and reduced interference. The product is industrial grade design, IP30 protection level, wave pattern aluminium reinforced chassis, 35mm rail mounting, DC (12~36V) wide power input, with relay alarm output, dual power supply redundancy protection and other advantages.

The TU847 defines local buses and the connection of their adjacent left and right peripheral slots. There are 13 local buses on each of the left or right side, and this bus allows the transmission of analogue signals in addition to digital signals. For example, peripheral slot #3 has a left local bus that can be connected to the right local bus on peripheral slot #2, while the right local bus on peripheral slot #3 is connected to the left bus on peripheral slot #4. In contrast, the left local bus on peripheral slot #3 and the right local bus are not connected to each other on the backplane unless the instrument module plugged into peripheral slot #3 connects these two signals.

The TU847 has 13 left or right local buses each, and this bus allows the transmission of analogue signals in addition to digital signals. For example, there is a left local bus on peripheral slot No. 3 that can be connected to the right local bus on peripheral slot No. 2, while the right local bus on peripheral slot No. 3 is connected to the left bus on peripheral slot No. 4. In contrast, the left local bus on peripheral slot #3 and the right local bus are not connected to each other on the backplane unless the instrument module plugged into peripheral slot #3 connects these two signals.