Hardy HI 4050, User Manual

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Mapping 109
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Chapter 6
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Mapping
About Mapping
Mapping allows you to set up certain monitoring and control activities to meet your process
requirements without programming. HI 4050 mapping is more flexible than the typical I/O
addressing used in a PLC. Since the HI 4050 does not use predefined I/O addressing, you
can tailor custom mappings to meet the unique requirements of your application. Whether
the input is digital data to be routed to a display (requiring the DIO card option) or a setpoint
signal used to trigger a command to a PLC, mapping is often the easiest way to achieve the
desired result.
Glossary of Mapping Terms
Assignment Statement - The assignment statement tells the computer to change the value
stored in the memory address named as a variable on the left side of an = sign. (The = sign
is called an assignment operator). For example:
i = a + b , means get the values stored in
memory locations a and b , add them together, then store the sum in location i .
Destination - This is the destination memory address to which data will be moved. left side
of the equation. See also Source.
I/O Interface - The section of the instrument that communicates with the external input.
Input Contact - Inputs interface selector and limit switches, push buttons, and sensors to
the HI 4050. An address assigned to each input identifies the location of the input device.
Input table - Defined in the section Input and Output Tables .
Local Mapping - See the section Local Input .
Network Mapping - This is mapping to and from network communication devices.
Node Number - This is the physical address of a device in a network.
Output table - Defined in the section Input and Output Tables .
Setpoints - Setpoints are for optional use in mapping digital I/O or other communication
values. A set point value is a threshold weight or level. It may be set in either net or gross
weight units. Up to four setpoints are available. Section 4 describes how you assign a set of
attributes to a setpoint, but you define the purpose of a setpoint based on how you apply
that setpoint within a mapping equation.
Source - This is the memory address of the data (right side of the equation) you want to
assign to the destination.