ABB SPAJ160C-DA controller module card inventory spare parts

Description

SPAJ160C-DA The graph shows the effects of configurable filtering on module response when the module is

configured for operation at 60Hz. The response of both 10mS and 20mS filter options is shown.

As explained, maximum line frequency rejection is obtained with the 20mS filter option.

SPAJ160C-DA The response curve above can be used to calculate maximum permissible AC line variations for a

given data stability. For example, using the 20mS input filter, the best possible rejection of AC

noise is -62dB or 20 log(1/562) assuming a clean 60Hz signal. The actual rejection may be less if

the frequency deviates. This ratio (1/562) is the SPAJ160C-DA relationship between data stability and the error

signal. For a system with a full scale of 20,000 microAmps and an LSB resolution of 1 microAmp,

stability resolving 1 part in 20000 requires the maximum AC line frequency component of the

signal be less than 562 microAmps peak-to-peak.

SPAJ160C-DA It is also possible to calculate the best resolution for a given AC disturbance. For example, a full

scale (20,000 microAmp) 60 Hz AC disturbance on the above system would produce a data

variation of 35 microAmps (20,000/562) or 0.18% of full scale.

Low Alarm Limit and High Alarm Limit

Each input channel can have a low alarm limit and a high alarm limit. If an input reaches one of its

limits, the module reports the actual value and sends the appropriate diagnostic bit in the %I table

of the BIU. Alarms do not stop the process or change the value of the input.

Alarm limits can be set anywhere over the dynamic range of the signal. The range for each is

-32,768 to +32,767. The high alarm limit must be greater than the low alarm limit. If alarm

reporting is not wanted, alarm limits can be SPAJ160C-DA set beyond the dynamic range of the signal so they will

never be activated.

Selection 2 will actually convert the full input current span down to 0 milliAmps and produce

negative values below 4 mA. Selection 1 produces engineering unit data in microAmps. The others

are binary-weighted. “None” permits selectable scaling.

Input conversions over full scale at about 25mA input produce an Overrange diagnostic. Input

conversions below a minimum 2mA value when selected range low span value is greater than 2mA

produce an Open Wire diagnostic. Input conversions at approximately 0mA value when 0-25mA

range is selected produce an Underrange diagnostic.

Scaling

SPAJ160C-DA Scaling defines a linear relationship between a channel’s input current in microAmps (µA) and the

value in engineering units returned to the BIU. The default scaling configuration provides values

from 4,000 to 20,000 for an input current range of 4mA (low span value) to 20mA (high span

value). The illustration below shows scaling for the default range selections.

To scale a channel, choose a high and low point and enter the actual input value (span) and a

corresponding engineering units value for each. During operation, the module will use these values

to convert input currents into digital values that represent engineering units. The “Open Wire”

diagnostic bit is enabled if actual input current value used for the “Low Point” is greater than 2

milliamps.

Engineering units values are 16-bit signed integers from -32767 to +32767. Span values are

unsigned integers ranging from 0 to 25,000.

If the scaled data falls below the minimum for engineering units, the module returns the minimum

engineering units value (-32768). If the scaled data rises above the maximum for engineering units,

the module returns the maximum engineering units value (+32767).

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