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ADA-7021
● Protection against power supply reverse connection,
● Integrated short circuit protection and over-voltage protection on Current Loop lines,
● DIN 43880 standard - mounting in typical electro-installation unit,
● Rail mounting according to DIN35 / TS35 standard,
● Dimensions (W x D x H) 53mm x 58mm x 90mm.
2.2.DESCRIPTION
Fibre-Optic converter ADA-7021 is a device used to connect devices with Current Loop interface without interfering with the data
format. The use of fibre-optic provides complete isolation between connected devices and resistance to interference on the
transmission bus. The fibre connection is implemented by a line consisting of two fibres - one fiber for the TX signal and one for RX
signal. Using two this type converters, can be use for communication with devices quite distant from each other eg. controllers, scales
etc.
ADA-7021 is equipped with screw terminal block for Current Loop and power supply connections. To Current Loop bus built on the
ADA-7021 can be connected 2 devices operating in half duplex mode or full duplex mode in point-to-point topology.
Overvoltage protection was made on base safety diodes and fuses on each Current Loop lines.
This converter has internal, low energy surge protection for each Current Loop lines however it is recommended to use the external
lightning arresters (typical protection of telephone line) for the lightning protection of lines.
ADA-7021
FIBER OPTIC to CURRENT LOOP
(CURRENT LOOP)
Current Loop Interface
2.3.CURRENT LOOP TRANSMITTER
The Current Loop transmitter in the ADA-7021 was made as a passive 0-20mA, having low energy short circuit protection on TX+ and
TX- lines. By the correct connection of the transmitter with power source I1, Current Loop transmitter 0-20mA can operate as active.
The transmitter diagram is shown on figure below.
Multimode Fiber Optic
CONVERTER
RX
TX
PWR
CL
10 – 30
VDC
53mm
Power Supply
10 - 30 VDC
Fig. 1. View
4
62mm
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