Current Input Modules (Isolated)
AAI143 provides 16 inputs of 4 to 20 mA signal. It can be used in dual-redundant configuration.
|Number of input channels||16, isolated|
|Input signal||4 to 20 mA|
|Allowable input current||24 mA|
|Input resistance||Power ON 270 Ω (20 mA) to 350 Ω (4 mA) (*2)|
|Power OFF 500 kΩ or larger|
|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)|
|External communication||Pressure clamp terminal, MIL connector cable, dedicated cable (KS1)|
|HART communication (*3)||Available|
*1: A Zener barrier is not allowed to be connected with this module. Use an isolation barrier when the module is used in
intrinsically safe application.
*2: The module input resistance viewed from the terminals depends on the current strength as calculated as below:
250 Ω +
voltage drop in the input protection circuit
*3: When this module is installed to a 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 ML 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 to allow margins for voltage drop in external wiring.