Introduction
Once you have defined the relevant stations and drivers in the System Configuration program, you are ready to define the PLC addresses for the process components in the Definition program.
This is done on the Edit Mapping tab in the object properties dialog box. You open this dialog box by double-clicking the object symbol on the process diagram.
What it shows
On this tab, you define PLC addresses for the relevant atoms and alarm texts.
The following properties are available:
| This property … | allows you to … |
|---|---|
|
Atom |
select the specific atom (aka measure point or data tag) for which you want to specify a PLC address. For example, for a digital object you can choose between the atoms: State, Command, Free Value, Alarm-In and Alarm-Out. |
|
I/O mode |
specify the “direction” of the atom. The modes are: In, Out, In/Out and Local. For a process value or digital state coming from the PLC, you will choose In. For a digital command going to the PLC, you will choose Out. In/Out goes both ways. Local is internal in IGSS with no communication to the PLC. |
|
Driver |
select the relevant driver for the current IGSS object. You can select the drivers defined in the System Configuration program. Remember that you can define a default driver for each area in the configuration. |
|
Node |
select the relevant node number. You select between the nodes defined in the System Configuration program. Remember that you can define a default node for each area in the configuration. |
|
Data Group |
type the relevant data group in the PLC where you want to write or read the data. Note that the terminology may change dependent on the driver you selected. Data group is the term used by Siemens PLCs and used internally in IGSS. |
|
Word Offset |
type the relevant word offset within the data group. Note that the terminology may be changed dependent on the driver you selected. Word offset is the term used by Siemens PLCs and internally in IGSS. |
|
Bit Offset |
type the relevant bit offset (0 - 31) within the word. Note that the terminology may change dependent on the driver you selected. Bit offset is the term used by Siemens PLCs and used internally in IGSS. |
|
External Type |
select the relevant external data type. You can choose between the external types enabled on the External Types tab for the selected driver in System Configuration. Click here for a list of the external types supported by IGSS. |
If the selected driver uses other terms than data group, word offset and bit offset, the driver-specific terms will be shown instead. This makes it easier for you to define the PLC addresses, because the terms are now the same as in the PLC manufacturer’s documentation. However, if you want to show the default terminology, hold down CTRL while you select the driver.