Hardy HI 4050, Руководство пользователя, Страница: 119 / 192

Mapping 111
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Often, more than two devices are involved, so separate input and output tables having
different addresses may be set up for data exchanges with each device.
In an HI 4050 mapping equation, the right side is for data from its input table and the left
side is for output.
A single equations uses at least two terms. There are limits to the number of terms allowed
with the two Samples per second selections or 110sps or 250sps. If 110sps the term limit
is 250. If the 250sps selection is used the term limit is reduced to 64. The number of
currently entered and allowed terms are noted on the browser mapping page. Complicated
equations are be more than two terms and that number will be noted (as an example
13/250). Example: CMD0=DSI0*DSO0 consists of three terms.
The HI 4050 scans through the I/O tables at either 110 times a second or 250 times per
second and reads any values they contain. If state or other values are stored in the tables,
the firmware processes the data and outputs it to an output device or the screen. If nothing
is stored to output, no output is sent. When an I/O scan occurs, the state of each input is
transferred from the input point to the input table for the receiving device, as shown in the
graphic below.
Inputs interface with selector switches, push buttons, limit switches and other sensors
connected to the HI 4050 for an ON/OFF connection. When the firmware is initiated, it
assigns the physical input contact to a memory address. (Remember Inputs = User
Switches.)
Mapping an input to a destination assigns the value of the input in the input table to an
output table address. For example:
Tare = Input #3 means assign the state (Open (0) or
Closed (1)) of Contact #3, contained in the Contact Closure input #3 memory address, in
the input table and move it to the Tare address in the output table.
Output variables are also further identified by the first two letters of the variable:
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HO - Hardy output table
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DO - DeviceNet output table
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EO - EtherNet/IP output table
The digital inputs on the Weight Controller are found in an input table, as are the items in
the DeviceNet input table. Some of the input table tables include:
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HI - Hardy input table
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DI - DeviceNet input table
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EI - Ethernet input table