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Current loop connection

The DIVIZE A2007 current loop test units are designed for 2 wire 4-20 mA current loop circuits. When used with an external power supply the A2007 current loop testers can also be used in 4 wire 4-20mA current loop circuits.

2 wire 4-20mA

2 wire 4-20mA current loop is mainly used for connecting sensors, in a 2 wire current loop the power supply for the sensor is delivered by the loop, therefore, an extra power supply is not necessary. The DIVIZE A2007 current loop test units can be used in 2-wire 4-20 mA current loop circuits.

In this situation the DIVIZE A2007 current source is passive and the device which receives the current signal is active, the current receiver delivers the power for the 4-20 mA current loop.

current loop tester 2 wire connection

4-wire 4-20mA

When used with an external power supply, the DIVIZE A2007 current source can be used for testing passive equipment such as I/P converters, valve positioners and loop powered displays. For testing 4-wire (passive) PLC and DCS inputs an external power supply is also required. As shown in the connection diagram below.

current loop tester 4-wire connection

In this situation the power for the loop is delivered by the external power supply, the A2007 current source controls the current in the loop, the current is received by the connected device.

A2007 connection examples

Below are example connection diagrams for commonly used PLC and DCS systems, also connection examples for positioners and I/P converters are provided.


A2007 connection to Siemens SM331 module 2-wire.


Hook-up diagram for A2007 and Siemens SM331 in 2-wire 4-20 mA setup


The Siemens SM331 module is configurable for both 2-wire and 4-wire 4-20 mA current loop by means of a plug at the side of the module. The diagram shows how to connect the A2007 current loop simulator when the module is configured for 2-wire 4-20 mA (2DMU) The plug is set to position D. In this configuration the module provides power to the A2007 current loop simulator.


A2007 connection to Siemens SM331 module 4-wire.


Hook-up diagram for A2007 and Siemens SM331 in 4-wire 4-20 mA setup

When the Siemens SM331 analog input module is configured for 4-wire 4-20 mA current loop it does not provide power for the A2007 current loop simulator. The diagram shows how the A2007 units are connected to the SM331 module when the module is configured for 4-wire 4-20 mA (4DMU) The configuration plus is set to position C

A2007 connection to Siemens Logo! AM2 analog input module.


Siemens Logo! AM2 Analog input 2 wire current connection

The A2007 current loop testes shall be connected to the AI1 terminal for Analog input 1 or AI2 terminal for Analog input 2. Both the A2007 and the AM2 Analog input module are passive and therefore do not supply power to the loop. This means an additional power supply need to be connected. In the example the power supply for the AM2 module is used to power the loop. Therefore the + connection of the A2007 current loop tester is connected to the 24VDC + terminal (L+) The - terminal is connected to the AM2 module AI1 terminal. The M1 terminal is connected to the M terminal (24VDC return) Current flows from the 24VDC supply through the A2007 current loop tester, through the AM2 module back to the 24VDC supply. The A2007 current loop tester is used to set the current in the loop which is measured by the AM2 module en converted in a digital value which is evaluated in the PLC program.


A2007 connection to Allan-Bradley 1771-IFE module.


Allan Bradley 1771current loop tester 2 wire connection


In the schematic diagram above the connection of the A2007 current loop simulator to the Allan Bradley 1771-IFE analog input module is shown. The A2007 current loop simulator is used to set the current in the loop. The Allan Bradley 1771 analog input module convert the current to a digital value which is used in the PLC program. In this way the A2007 current loop simulator can be used to test and validate the PLC program. The Allan Bradley 1771-IFE module does not supply power to the loop. Since the A2007 is a passive device and also does not supply power to the loop an external power supply is necessary.


A2007 connection to Allan-Bradley Micro800 PLC.


Allan Bradley Micro800 2085-IF4 current loop tester 2 wire connection


The Micro800 PLC comes with passive current inputs. Therefore an external power supply is necessary to power the A2007 current loop simulator, the schematic diagram above shows the connection of the A2007 current loop simulator to the Allan Bradley Micro 800 PLC with 2085-IF4 or 2085-IF8 analog input module. The A2007 current loop simulator is used to set the current in the loop, the measured current can be evaluated in the PLC program. The 4-20 mA signal can represent a physical measuring value. See the page about the 4-20mA calculator for more information.


A2007 connection to DeltaV AI 16-channel 4-20mA HART card.


Delta-V AI16 HART 2 wire connection diagram


A2007 current loop simulators can be used to test the Delta-V AI 16-channel HART card. This card is provided with a power supply for the connected field transmitters so the A2007 current loop simulator can be connected direct. (The HART functionality is not provided in the A2007 simulator) Only the analog 4-20 mA signal can be simulated with the A2007 simulator.


A2007 connection to Siemens Sipart PS2.


Siemens Sipart PS2 positioner connection diagram


The schematic diagram above shows the connection of the Siemens Sipart PS2 electropneumatic positioner to the A2007 current loop simulator. The PS2 electropneumatic positioner is used to control pneumatic valves based on the 4-20 mA signal. In order to test the positioner the 4-20 mA signal need to be simulated with the A2007 current loop simulator. Since both the positioner and the A2007 current loop simulator are passive devices a power supply is necessary to power the loop.


A2007 connection to Fisher 846 I/P converter.


Fisher 846 I/P converter connection example


The Foxboro 846 I/P connector is used to convert a 4-20mA signal in to a pressure signal. The pressure can be used to drive the pneumatic positioner of a control valve. With the A2007 current loop simulator the functionality of the Fisher 846 I/P converter can be tested. In the diagram the connections are shown. The Fisher 846 I/P converter is powered from the 4-20 mA current loop, also the A2007 is powered from the 4-20mA current loop. Therefore an power supply is necessary. The current will flow from the power supply to the A2007 simulator. The current is controlled by the A2007 simulator and will flow to the Foxboro 846 I/P converter where it is evaluated. Then the current will flow back to the power supply closing the loop.


© August 23, 2012

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