DCS CPU-366 Bedienungsanleitung PDF herunterladen (Seite 33)

3-14 Series 90™-30 CPU with Embedded PROFIBUS Interface – November 2004 GFK-2334A

Configuring Module Data Areas

To configure module data areas, right click the module node in the Hardware

Configuration, and choose Configure. The Parameter Editor window for the module

appears.

The values for read-only parameters are supplied from the GSD text file that defines the

Profibus module's characteristics. Most devices have one data area with inputs, outputs or

both. Some devices have multiple data areas that are shown as additional rows.

Data Area Parameters

Area

This value is an index beginning at 1. Read-only.

Type

Specifies whether the data is input or output as well as type, digital or analog. Value can be Digital

In, Analog In, Digital Out, or Analog Out.

Ref Address

Specifies the memory area that is used to map the data area. Regardless of the reference type

used, input areas are considered as consumed and cannot overlap, while output areas are

considered as produced and may overlap.

Allowable Ranges: %AI, %AQ, %I, %Q, %G, %R, %T, %M.

If the number of bytes is odd, analog memories are not allowed and selections are limited to: %I,

%Q, %G, %M

Length

Specifies the length of the reference. Includes the entire data area by default. If set to 0, the data

area is not mapped.

For discrete memories, the allowable range is [0, 8, 16, …, X]

For analog memories, the allowable range is [0, 1, 2, …, X]

Swap Bytes

The swap bytes field is used to manipulate the byte order. Because PROFIBUS devices often do

not follow the standard, the ability to change byte ordering is provided. The analog areas travel in

MSB and should be swapped if LSB is required.

■ If Type is Digital and the module has an odd number of bytes, Swap Bytes is set to False (no

swapping) and read-only.

■ If Type is Digital and the module has an even number of bytes, default is set to False. Setting

Swap Bytes to True causes the LSB and MSB to be swapped before the data is mapped into

PLC memory.

■ If Type is Analog, default is set to False. Setting Swap Bytes to True causes the LSB and

MSB to be swapped before the data is mapped into PLC memory.

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DCS CPU-366 Bedienungsanleitung Seite 33