ICC

N50 is targeted for writing, the written data is disseminated to the drive’s registers according to the definition contained in the EtherNet/IP consumed register configuration array. By appropriate configuration of the EtherNet/IP consumed and produced register configuration arrays, therefore, bulk access to non-contiguous but frequently-used drive registers can be conveniently provided by performing only one read and/or write instruction targeting file N50.

Because both the EtherNet/IP consumed and produced register configuration arrays are comprised of 32 register definitions, the targeted “offset/element” must be within the range of 0 to 31 inclusive. Refer to Table 6 for some examples of N50 accesses.

Table 6: Examples of EtherNet/IP-Style Bulk Access via File N50

 

Offset/Element

 

Start Target Register of

Max Number of

 

 

Configuration Array

Accessible Elements

 

 

 

0

 

1st

32

:

 

:

:

15

 

16th

16

:

 

:

:

31

 

32nd

1

The application PLC program uses a MSG instruction that is configured with a “Data Table Address” from which to start the access and a “Size in Elements” which determines the number of items to access (read or write). The “Data Table Address” is constructed by selecting a “File/Section Number” and an “Offset/Element” according to Equation 3. For example, a “File/Section Number” of N23 and “Offset/Element” of 5 = N23:5, which corresponds to register 1305 (the drive’s input voltage monitor register).

13.3.2 SLC-5/05 Example: Read a Register Block

This example program will show how to continuously read a block of registers from the drive with a single MSG instruction. Only one read request is outstanding at any given time.

1)Run RSLogix 500, and create a new configuration.

2)Create a control and a data file.

a)Right click Data Files and select New… The “Create Data File” dialog box appears (refer to Figure 88).

b)To create a control file, enter a file number (e.g. 20), set the type to “Integer”, enter a descriptive name (e.g. “CONTROL”), and enter a number of elements (e.g. 100). Click OK to create the file. The control file is used to store configuration information pertaining to the functionality of the MSG instruction which will perform the data read.

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