Supporting ABB model V18345-1010121001 actuator positioner

Description

V18345-1010121001 The same 24 volt power supply used for the Bus Interface Unit can provide loop power to the

outputs in most cases. If module to module (or Bus Interface Unit) isolation is required, separate

power supply(s) must be used.

The most common application would have the loop supply local at the module, driving multiple

isolated transducers, isolated analog inputs, or differential analog inputs.

LED

An LED, V18345-1010121001 visible through the transparent portion of the module top, indicates whether field and

backplane power are present.

V18345-1010121001 The Current Source Analog Output Module has 4 words (8 bytes) of analog output data. A Bus

Interface Unit is required to provide this output data to the host and/or local processor.

The module converts analog values from the host or local processor into output current. Scaling for

the module is performed by the Bus Interface Unit. Software Range Selection of 0 to 20mA and 4

to 20mA is available on a per-channel basis. V18345-1010121001 Using the 0 to 20 mA range requires the installation of

an external wire jumper between JMP and RET.

The default scaling for this module is:

0-20mA Range 4-20mA Range

Eng Lo = 0 Eng Lo = 0

Eng Hi = 20,000 Eng Hi = 20,000

Int Lo = 0 Int Lo = 4,000

Int Hi = 20,000 Int Hi = 20,000

The default range is 0 to 20mA. The module is shipped with no wire jumper present. The jumper

must be installed to correspond to the module’s default range and scaling.

The 4-20mA range provides a fixed 4 milliamp offset (0mA = 4mA signal), with a 16mA signal

span. The 4mA offset remains as long as analog loop power is applied, even if the logic power is

off. Note that default outputs for loss of host communications require both backplane power and

analog field power.

V18345-1010121001 A second output on each channel provides an uncalibrated voltage output. The 4 to 20mA range

corresponds to 0 to 10 volts. The 0 to 20 mA range corresponds to 0 to 12.5-volts. A wire jumper is

required for the 0 to 20mA range. Both voltage ranges have restricted load current drive capability

above 10 volts. Voltage can be used alone, or simultaneously with current to drive meters or

voltage input devices.

An OPEN WIRE diagnostic available per channel operates only on the current outputs. If you are

using only the voltage output of a channel, you should either disable the fault or connect a dummy

load of 250 to 800 ohms across the current terminals of the channel. An OPEN WIRE fault will not

affect the operation of the voltage output.

Output register values outside the capability of the module will drive the output to the appropriate

minimum or maximum level but will not generate a diagnostic fault.

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