ABB XVC517AE02 3BHB004744R0002 module controller

Description

XVC517AE02 This is the voltage between the analog signal wires and the common point of

the power supply of a differential signal, or to ground in the case of an

isolated signal. It is desirable that all common mode signals are ignored by

the circuit, XVC517AE02 but in practice there is some error introduced in the data. This is

specified as Common Mode Rejection Ratio (CMRR), usually expressed in

decibels (db). Differential circuits also have a maximum common mode

voltage specifications, usually stated as a maximum voltage with respect to

circuit common. Exceeding the common mode voltage rating of differential

signals causes large errors in the data conversion and may affect several

points.

XVC517AE02 Unipolar signals or ranges do not change polarity during normal operation;

for example 0 to 10 volts, or 4mA to 20mA. Reversed connection to a

unipolor input will produce minimum value and, if diagnostics are available,

underrange or open wire faults.

Bipolar

Bipolar signals can reverse polarity in operation. Reversed signal

connections to a bipolar input will produce data of opposite sign.

XVC517AE02 Ground Loop

When a conductor is grounded in more than one place, differences between

grounds can induce currents producing voltage drops in the wire. If the

conductor is also used to carry an analog signal, these voltage drops produce

an accuracy error or noisy values. If a single point ground is used, the

voltage difference between locations may still appear in series with the

desired signal. XVC517AE02 This is overcome by using differential or isolated inputs and

running a separate return from the remote source. This preserves the

integrity of the signal, and the ground voltages appear as common mode

voltage at the receiving end.

Current Loop

XVC517AE02 This is a standard analog interface defined by the Instrument Society of

America in ANSI/ISA-S50-1. The signal level is 4mA to 20mA. Three types

of signal sources are defined, Types 2, 3, and 4. These correspond to the

number of wires used. The isolation of the transmitter may impact the type

of PLC input required. When non-isolated inputs are used, isolation may be

provided by means of a current transducer that has isolation between the

current loop and/or power supply. The Standard covers only isolated or

common (single-ended) inputs. Differential inputs often used in PLCs, and

connecting several current loops together, as often occurs with PLCs, are not

covered well in the Standard, and often introduce additional complication

regarding location of commons and grounds.

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