Elseta IOMOD 4RTD Руководство пользователя - Страница 4

Просмотреть онлайн или скачать pdf Руководство пользователя для Измерительные приборы Elseta IOMOD 4RTD. Elseta IOMOD 4RTD 9 страниц. Modbus

Termination resistor

Power

Power Supply

Current consumption

Device Connection

IOmod 4RTD can be powered through main power connector +12/24 VDC or through USB. Apply +12/24VDC to V+

and 0 V to V-. The device has a built-in reverse voltage polarity, overcurrent and overvoltage protection.

IOMod 4RTD has one RS485 connector. Connect RS485 cable pair to contacts marked RS485/A and RS485/B.

Connections should be made with minimum possible cable stub.

IOMOD 4RTD has integrated 120Ω termination resistor which can be enabled or disabled over USB configuration. It is

recommended to use termination at each end of the RS485 cable. See typical connection diagram on Fig. 5.1.

IOMOD 4RTD has 1/8 Unit load receiver which allows to have up to 256 units on line (compared to standard 32 units).

To reduce reflections, keep the stubs (cable distance from main RS485 bus line) as short as possible when connecting

device.

IOMOD 4RTD devices has indications that help user easily debug possible problems. Light emitting diodes can show if

RTD fault has happened on any of four RTD measuring channels (FLT1-FLT4). STAT LED indicates if proper power

Selectable, 120Ω

9-33 VDC

40mA @ 12VDC, 20mA @ 24VDC

Fig. 5.1. Typical IOMod connection diagram