Abb XI16E1-F4.0 1SBP260100R1001 Power Module

Description

XI16E1-F4.0 The 8 Point Analog Current-source Output Module performs diagnostics and provides 32 bits (4

bytes) of diagnostic data to the BIU. Data is placed in the BIU’s discrete input (I) data table starting

at the configured reference. XI16E1-F4.0 The module sets the appropriate bit of this data when a diagnostic

condition is detected. Diagnostics bits remain set until cleared by the appropriate data outputs, as

described below. The condition causing the fault must be corrected, or the module will set the bit

again.

Use of this data is optional. The module is easily configured to use all, some, or none of the

diagnostic data.

XI16E1-F4.0 The BIU uses two bytes of discrete output data to clear the module fault and alarm bits. The fault

clearing bits start at the mod\ule’s configured discrete output reference in the BIU’s discrete output

(Q) table.

Setting a bit in the first byte of discrete output data to 1 clears the over/underrange and open wire

alarms for the corresponding channel (even if the alarm conditions are still present).

The first two bits of the next byte can be used to clear module diagnostics (byte 0) bit #7 (“User

supply not detected”) and bit #3 (“BIU Timeout”).

Bits #0-2, 4, and 6 in the module diagnostics byte are calibration-related and should never be set

during normal operation. XI16E1-F4.0 These bits cannot be cleared using discrete output (Q) data. If any of these

bits is set during normal operation (not during calibration), a problem exists and the module should

be returned.

Single-ended circuits have the signal measured relative to a common

connection, usually the power supply. Other analog I/O signals typically

share this common. Single-ended circuits require fewest terminal points,

giving the highest density and lowest price, but at the cost of more restrictive

wiring and errors due to voltage drops and currents in the common

connections. Single-ended circuit connections are most similar to the wiring

of discrete modules.

Signal

XI16E1-F4.0 Common

The term “signal common” refers to a point in the signal that may be

connected to the corresponding points in other signal loops. It may or may

not be connected to earth ground.

Differential

Differential signals are measured on two wires which are separate, but not

isolated from the power supply. Differential inputs allow a greater degree of

freedom in wiring commons and grounds without affecting accuracy. There

is a limited voltage rating (see Common Mode) between the signal level

wires and the power supply wires. This limitation also applies to voltage

differences among additional I/O on the same supply. Differential inputs

usually come in groups sharing the supply common tie point. Some voltage

outputs may have an “external return” or “remote sense” which allows the

load common or ground to be different than the supply of the output module

by a small voltage. “Current loop”signals are less susceptible to differences

in voltage between circuit components. Differential inputs permit series

inputs with current loops, since the signal can be offset from common. Do

not confuse differential inputs with isolated inputs; differential requires the

common tie point reference for all inputs of the group, usually either ground

or the supply common.

Isolated

Isolated inputs are usually two-wire and are dielectrically insulated from

supplies and ground. Sometimes additional connections are provided for

excitation of transducers such as RTDs, but these signals are not shared with

other I/O points. Isolated modules allow high voltages to exist between I/O

devices and the PLC. Do not confuse isolated inputs with the isolation

between groups of analog circuits, or isolation from other components of the

system, such as logic or power supplies.

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