Specifications

67 GX Configurator-DP

User MIT-Address

The purpose of user devices is to access an I/O area via a fixed device address. The buffer

device address of an I/O area should not be referenced by the PLC application program, because

they change, when slaves and/or modules are added or removed.

To assign a user device select the cell in the column ‘User MIT-Address’ and enter the device

address. A list shows the available device types and maximum address ranges. The actually

available device ranges depend on the CPU type and CPU parameters and may be smaller.

Whether a device can actually be used, can only be checked, when the generated code has been

imported into the PLC program.

User devices must not overlap with each other or with the device areas used as I/O transfer

buffer. This restriction is checked, when the I/O mapping editor is closed.

Global Variable Identifier

The PLC code for I/O mapping contains fixed default global variables for the slaves and modules.

The variable name is constructed from the head address of the master, the FDL address of slave

and the slot index of the module. This ensures unique identifiers even if several master modules

are integrated in the same PLC program. The application can access each I/O area by specifying

the name of the DUT variable and the respective DUT element name.

If a fixed application specific name is required, a separate global variable name can be assigned

to an I/O area by entering a unique name in the column ‘Global Var. Identifier’. The generated

code contains a global variable definition of the same type as the DUT element, to which the

variable has been assigned. In that case the corresponding I/O point can be accessed either via

the DUT element or via the global variable.

Two global variables may not have the same name. This restriction is checked, when the I/O

mapping editor is closed.