156 Rockwell Automation Publication 7000-UM202H-EN-P - November 2023
Chapter 3 Control Component Definition and Maintenance
Analog Inputs and Outputs
The PowerFlex™ 7000 drive offers one isolated process current loop
transmitter and three isolated process current loop receivers, embedded into
the control. These are accessible on the ACB.
The isolated process output is configured as 4-20 mA. The three isolated
process inputs are individually configurable for either a range of -10/0/+10V or
4-20 mA.
The following information details the connections for each input and output.
Current Loop Transmitter The current loop transmitter sends a 4-20 mA output to an external receiver.
The loop compliance on the transmitter is 12.5V. Loop compliance is the
maximum voltage at which a transmitter can generate to achieve the
maximum current and is usually a function of the power supply voltage.
Therefore, the PowerFlex 7000 transmitter can drive a receiver with an input
resistance up to 625 Ω. Figure 132
shows a block diagram of the transmitter.
Figure 132 - Process Loop Transmitter block diagram
This type of transmitter is known as a 4-wire transmitter, and will “sink”
current from a receiver. The receiver is connected by two wires only from pins
20 (+ connection) and either pins 18, 19, 21 (- connection).
The recommended connection is shown above. The type of shielded cable used
is application specific and is determined by the length of the run, the
characteristic impedance and the frequency content of the signal.
DSP
FPGA
+15V
Isolated
DC/DC
Converter
+15V
5V
Optical Interface
D/A
#
Current Boost
IFM
20
18
19
21
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