Current Input Modules (Isolated)

The Yokogawa AAI143-S50 module provides 16 inputs of 4 to 20 mA signals and can be used in dual-redundant configurations.

Items Specifications

Model: AAI143 (*1)

Number of input channels: 16, isolated

Input signal: 4 to 20 mA

Allowable input current: 24 mA

Withstanding voltage:

• Between input and system: 1500 V AC, for 1 minute (*4)

Input resistance:

• Power ON: 270 Ω (20 mA) to 350 Ω (4 mA) (*2)
• Power OFF: 500 kΩ or larger

Accuracy: ±16 µA

Data update period: 10 ms

Transmitter power supply:

• 19.0 V or higher (at 20 mA)
• 25.5 V or less (at 0 mA) (output current limit: 25 mA) (*5)

Setting of 2-wire or 4-wire transmitter: For each channel by setting pin

Drift due to ambient temperature change: ±16 µA/10 ˚C

Maximum current consumption:

• 230 mA (5 V DC)
• 540 mA (24 V DC)

Weight: 0.3 kg

External communication: Pressure clamp terminal, MIL connector cable, dedicated cable (KS1)

HART communication: Available (*3)

Model: AAI143

Description: Analog Input Module (4 to 20 mA, 16-channel, Isolated)

Ordering Number: AAI143-S50

Dimensions (L x W x H): 107.5 mm x 32.8 mm x 130 mm

Suffix Codes

• -S: Standard type
• 5: With no explosion protection
• 0: Basic type

Notes

1. A Zener barrier is not allowed to be connected with this module. Use an isolation barrier when the module is used in an intrinsically safe application.
2. The module input resistance viewed from the terminals depends on the current strength as calculated as below:
   • 250 Ω + current value
   • voltage drop in the input protection circuit
3. When this module is installed to an ER bus node unit with HART function, the EB401 firmware must be rev. 2 or later.
4. When the dedicated cable is used, the withstanding voltage is 500 V AC (between the input signal and the system). When the MIL connector cable is used, the withstanding voltage depends on the electrical specifications of the cable.
5. This voltage is generated between the connecting terminals for 2-wire transmitters for this module. When calculating the minimum operating voltage for transmitters, consider allowing margins for voltage drop in external wiring.