Application Guide

SAG586505000 System Application Guide
SAG586505500 Spec. No. 586505000 (Model LMS1000)
Issue AZ, April 7, 2014 Spec. No. 586505500 (Model LMS1000)
Page 28 of 62
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Example: A9001,
A represents an analog input/channel
90 represents the VPS/NPS MCA Node (cannot be changed)
01 represents input/channel #01
Example: A9901,
A represents an analog input/channel
99 represents the NPS MCA Node (cannot be changed)
01 represents input/channel #01
Example: A0101,
A represents an analog input/channel
01 represents the 582140000/582140001/582126100 Primary Bay Node
(cannot be changed)
01 represents input/channel #01
Example: A0201,
A represents an analog input/channel
02 represents an 582140000/582140001/582126100 Secondary Bay Node
(cannot be changed)
01 represents input/channel #01
(B) Channel Configurations: Each channel has certain attributes that are used by the
system in the various software features it provides. These attributes are presented to the
user in the channel configurations which allow the user to enter specific information
pertaining to these attributes.
(1) Analog Channels: These channels monitor a variety of DC voltages or temperatures.
Additionally, with external interfaces, these channels can monitor other signals such as
AC voltages, current, and oil pressure. Each of the analog channels has four
adjustable alarm limits that can be programmed to report an alarm condition, or record
this condition for statistical purposes. Alarms can be distinguished as low or high
alarms, and an "Alarm Polarity" attribute can be set to further define the alarm.
Note: Channels of the eight input temperature circuit card are assigned as Analog
Channels in the system configuration. These inputs can be set to display in
Celsius (default) or Fahrenheit.
• Alarm Polarity Attribute: Provides means to specify the sign of the signal
connected to an analog input. This allows the value of the input signal to be
processed correctly for display to the user and for calculation of statistics and
alarm limit activation.
a) Positive polarity (‘+’): (default value) The value of the input signal is
displayed using the sign as provided by the hardware circuitry. The
processing of alarm limits and statistics is performed with the most positive
value being a ‘High’ signal and the most negative value being a ‘Low’ signal.
b) b) Negative Polarity (‘-‘): The value of the input signal is inverted
(multiplied by -1) before it is displayed or used for processing. The
processing of alarm limits and statistics is performed with the most negative
value being a ‘High’ signal and the most positive value being a ‘Low’ signal.
For example, given a float voltage of –54.0V, –56.0V is a high limit.
• Alarm Limit Mode: Provides means to specify how processing of alarm limits is
performed. .
a) Normal mode: (default value) Analog alarm limits are processed using the
‘High’ and ‘Low’ values as determined by the analog channel’s polarity
attribute (discussed above).
b) Bipolar mode: Analog alarm limits are processed using zero as the ‘Low’
value and the most positive or negative value as the ‘High’ value. An alarm
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