application connection

• network topology

RS485 bus access to this device, should be in line with the RS485 bus wiring specification, using a hand in hand network topology to connect with other devices in the system, and at the end of the bus to join the matching resistance of about 120 ohms (as shown in the ideal connection diagram below). However, in the actual project, is in accordance with the actual connection diagram below for wiring, the figure D for the RS485 bus to the length of the branch line of the device, the length of D is strongly recommended to be less than 0.5 meters

Ideal Linkage Diagram

Actual connection diagram

• Sensor connection method

FBTAI08EM supports common analog modules, which can collect standard current and voltage signals. Current includes: 0-20mA, 4-20mA two kinds of signals, voltage includes: +/-5V, +/-10V three kinds of signals. The wiring terminals of the common analog module are shown in the figure below, and there are two terminals for each analog channel.

1, 4-wire sensor wiring
A four-wire signal means that the signal and power lines on an analog instrument or device add up to four wires. The instrument or device has a separate power supply, and in addition to the two power lines there are two signal lines. The wiring of a four-wire signal is shown in the following figure

2, 3-wire sensor wiring
Analog voltage/current 3-wire wiring shown

3, 2-wire sensor wiring
Two-wire signaling means that the signal and power wires on the instrument or device add up to only two terminals. Since the FBT Industrial IO analog module channels do not have a power supply, the instrument or device requires an external 24V DC power supply. Analog voltage/current two-wire wiring shown.

Due to the extremely high input impedance of voltage input type devices, the conversion value of the unconnected input channel may be randomly jumped depending on the difference in device parameters, so it is recommended that AI+ and AI- of the unused input channel be short-circuited.