Item reference syntax

Use item references to access data stored in memory registers in connected devices, as well as to access standard system items in the Communication Driver itself.

This section only describes the item reference syntax and options for the BACLITE server. For more general information about item references, see "Manage device items" and "Item reference descriptions" in the Communication Drivers Pack Help.

Item references in this Communication Driver use the following syntax.

We can communicate with a specific PLC object instance and property using the following syntax:

<type>:<instance>:<property>:[priority array]

The following syntax diagram shows address options:

register type :instance : property { | :priority array }

where,

register type: The type of the register. Valid types are AI, AO, AV, BI, BO, BV, DEV, MSI, MSO, MSV, SCH, LSP, LSZ, ACC, AVR, CAL, CMD, EVT, LOP, NOT, PRG, PC, GRP, FO and TL.

Instance: The instance of the specified register type.

Property: The property of the specified register type and instance.

Priority array: The priority for writing. If no value is specified, the default value is 16.