The Helman Group 1769 WEIGH SCALE MODULE HM1525 - Manual (Page 8)

Preface
Terms and
Abbrevia-
tions
The following terms and abbreviations are used throughout this manual. For definitions of terms
not listed here refer to Allen-Bradley’s Industrial Automation Glossary, Publication ICCG-7.1.
Calibration - Procedure, performed by trained personnel, where machine or press is
dynamically loaded to impact on load cells. A process of linearity measuring to determine the
loading capacity of the machine.
Calibration Number - Amplification values established during machine calibration or pre-
assigned on force load cells.
Channel - Refers to one of two, strain gage inputs available on the modules terminal block.
Chassis - A hardware assembly that houses devices such as I/O modules, adapter modules,
processor modules, and power supplies.
Configuration Word - Contains the channel configuration information needed by the module to
configure and operate each channel. Information is written to the configuration word through
the logic supplied in your ladder program.
Data Word - A 16-bit integer that represent the value of the analog input channel. The channel
data word is valid only when the channel is enabled.
Gain - Amplification of an input signal.
Load/Force - Measurement of impact during a machine cycle. Sensors provide the input for
this measurement.
LSB - (Least Significant Bit) Refers to a data increment defined as the full scale range divided
by the resolution. The bit that represents the smallest value within a string of bits.
Remote Configuration - A control system where the chassis can be located several thousand
feet from the processor chassis.
Resolution - The smallest detectable change in a measurement, typically expressed in
engineering units (e.g. 0.15C) or as a number of bits. For example a 12-bit system has 4,096
possible output states. It can therefore measure 1 part in 4096.
Sample - Load/force values established from a series of machine cycles. Also defined as
benchmark.
Sampling time - The time required by the A/D converter to sample an input channel.
Scale - Value used to describe the press/machine overall tonnage. Set for maximum value of
one channel. For example, settings for a 150 ton press = 75.
Status Word - Contains status information about the channel’s current configuration and
operational state. You can use this information in your ladder program to determine whether
the channel data word is valid.
Update Time - The time required for the module to sample and convert the input signals of all
enables input channels and make the resulting data values available to the SLC processor.
P-4