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Acquire™ is a trademark of Ambrit Ltd

Adding a Field to a Flow Computer

Acquire must be in Config mode to perform these steps.

1. Add a PLC

Follow these instructions to add a PLC.

2. Click the ‘Configure’ tab

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3. Click the ‘Add’ button

The Flowcomputer Fields screen will be displayed:

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4. Enter the fields as follows:

Modbus Address This is the Modbus Address of the field in the PLC.
Data Map The data map determines the type of Modbus message that needs to be sent to poll the value. Options include “Coils”, “Inputs”, “Holding Registers” and “Input Registers”.
Full Field Name This is the name that Acquire will use to refer to the field.
Field Type See below for how to set up field types.
Units Select a unit from the popup menu or enter a new one. New units will be made available when adding subsequent fields to the Modbus map.
Units Type Units Types are not available for PLCs.
Security Level Acquire uses Security Levels to determine the level of access that the user must have to change a field’s value. Security Level 0 is always not enterable. Set the Security Level to match the user’s permissions.
Text Descriptions Follow these instructions to set up text descriptions.
Read Formula Follow these instructions to set up read formulas.
Write Formula Follow these instructions to set up write formulas.
Raise and alarm if value non zero This will mark the field as being an alarm. An alarm will be raised in Acquire if this value is non zero.
Do not log changes in the audit trail This checkbox will prevent any value changes being written to the Acquire audit trail. This is useful if the field triggers a different event and there is no need to audit the change.

5. Click the ‘Edit’ button next to the field type

The Field Type window will be displayed.

Field Types include “Integer”, “Float”, “Double”, “String”, “Boolean” and “Text Buffer”. The selected field type will determine the options available.

Integer

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Field Type Set the Field Type to “Integer”.
Number of Bits This is the number of bits used to reflect the integer value. Options include “8″, “16″ or “32″ bits.
Number of Registers This is the number of registers used to reflect the field type.
Signed This indicates that the first bit in the numeric representation determines whether the field is negative or not. Unsigned integers can store higher values.
Reverse Byte Order By default Modbus fields are sent using the byte order 4 3 2 1. Selecting reverse byte order switches this to use 3 4 1 2.
Reverse Register Order By default Modbus fields are sent using the byte order 4 3 2 1. Selecting reverse register order switches this to use 2 1 4 3.

Floats

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Field Type Set the Field Type to “Float”.
Number of Bits This is the number of bits used to reflect the fields value. Floats use 32 bits to store their value.
Number of Registers This is the number of registers used to reflect the field type. This will default to 1.
Reverse Byte Order By default Modbus fields are sent using the byte order 4 3 2 1. Selecting reverse byte order switches this to use 3 4 1 2.
Reverse Register Order By default Modbus fields are sent using the byte order 4 3 2 1. Selecting reverse register order switches this to use 2 1 4 3.

Double

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Field Type Set the field type to “Double”.
Number of Bits This is the number of bits used to reflect the fields value. doubles use 64 bits to store their value.
Number of Registers This is the number of registers used to reflect the field type. This will default to 1.
Reverse Byte Order By default Modbus fields are sent using the byte order 4 3 2 1. Selecting reverse byte order switches this to use 3 4 1 2.
Reverse Register Order By default Modbus fields are sent using the byte order 4 3 2 1. Selecting reverse register order switches this to use 2 1 4 3.

String

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Field Type Set the field type to “String”.
Number of Bytes This is the number of bytes used to store the string. Strings use 1 byte per character.
Number of Registers This is the number of registers used to reflect the field type. This will default to 1.
Reverse Byte Order By default Modbus fields are sent using the byte order 4 3 2 1. Selecting reverse byte order switches this to use 3 4 1 2.
Reverse Register Order By default Modbus fields are sent using the byte order 4 3 2 1. Selecting reverse register order switches this to use 2 1 4 3.

Boolean

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Field Type Set the field type to “Boolean”.
Number of Bits A boolean uses a single bit to store its value. 1 is true, 0 is false.
Number of Registers The number of registers is fixed to 1.

Text Buffer

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This is a custom field for the Omni flow computer that is used to access the reports.

6. Click the ‘OK’ button

The selected field type will be added to the Flowcomputers Fields screen:

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6. Click the ‘OK’ button