SDCS-PIN-51 3ADT220090R0006 New ABB Accessories

Description

Like other Field Control modules, the 16 Point Analog Input module is usually configured from the

Bus Interface Unit, using a compatible hand-held programmer. The module’s configuration can

also be read or written from the bus when used in a system that supports such configuration. The

table below summarizes configuration choices and defaults. The module will power up with the

default configuration settings. For configuration instructions, refer to the Bus Interface Unit User’s

Manual.

Each channel can be configured as either active or inactive. If a channel is inactive, it is not

scanned. The filtering, scaling, calibration, and alarm checks are omitted for that channel, and a

value of 0 is returned to the BIU.

Filtering

The module uses an input filter, a line filter, and an averaging filter to reduce the effect of

disturbances due to noise. Typical noise sources include high frequency signals superimposed on

the input signal and AC variations. AC noise can be caused by power supply ripple in analog

sources, line pickup, or other random pickup. The module’s input filter is hardware-controlled

while the line and averaging filters are software-configurable for any active channel. Filtering does

not eliminate the need to control input signal quality by providing stable signal sources, stable

power supplies, proper signal shielding, and appropriate signal separation.

Input Filter

The input signal passes through a low-pass input filter. This filter is a second-order active RC filter

with a transition (corner) frequency of 10Hz.

Line Filter

Disturbances due to AC noise cause variations around the desired DC level. These variations

appear at a beat, or “alias” frequency. The amplitude of these variations can be reduced by

configuring the rate at which the module scans inputs for the operating frequency. Line frequency

is configurable as 50 or 60 Hz. If the line frequency is configured at 60 Hz, the module scans each

input channel every 1.04 milliseconds. If the line frequency is configured at 50 Hz, the module

scans each input channel every 1.25 mS.

Averaging Filter

The software filter is an averaging filter that runs at the line frequency. This filter provides

additional low-pass response, and high rejection at line frequency and select harmonics of the line

frequency. The averaging filter configuration choices are:

20 mS: The average value of 16 A to D conversion samples taken over a full line cycle

(16.67mS at 60 Hz, 20 mS at 50 Hz). This filter provides additional rejection at 60, 120 and

180 Hz for 60Hz operation. The 50 Hz response is similar, with the rejection notches at 50,

100, and 150 Hz.

10 mS: The average value of 8 samples over a half line cycle (8.3 mS at 60 Hz, 10 mS at 50

Hz). This option improves the signal-to-noise ratio due to the integrating effect of an 8-sample

average. The 10 mS filter does not significantly improve AC line rejection because additional

rejection is only offered at 120Hz for 60Hz operation and 100Hz for 50Hz operation.

Because frequency tolerance for the 20mS and 10mS filter options is relatively narrow, it is

important to configure line frequency properly. Also, low frequency noise is not affected by this

averaging filter as shown by the following example. If required, additional averaging or

exponential filters may be set up in the CPU to further process the data.

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