Rockwell-automation 20-COMM-ER 20-COMM-ER Dual-Port EtherNet/IP Commun Manual de usuario descargar pdf (Pagina 202)

202 Rockwell Automation Publication 20COMM-UM015B-EN-P - July 2013

Appendix C EtherNet/IP Objects

Descriptor Attributes

Bit Name Description

0 Data Type (Bit 1) Right bit is least significant bit (0).

000 = BYTE used as an array of Boolean

001 = WORD used as an array of Boolean

010 = BYTE (8-bit integer)

011 = WORD (16-bit integer)

100 = DWORD (32-bit integer)

101 = TCHAR (8-bit (not unicode) or 16-bits (unicode)

110 = REAL (32-bit floating point value)

111 = Use bits 16, 17, 18

1 Data Type (Bit 2)

2 Data Type (Bit 3)

3 Sign Type 0 = Unsigned

1 = Signed

4 Hidden 0 = Visible

1 = Hidden

5 Not a Link Sink 0 = Parameter can sink a link

1 = Parameter cannot sink a link

6 Not Recallable 0 = Recallable from NVS

1 = Not Recallable from NVS

7 ENUM 0 = No ENUM text

1 = ENUM text

8Writable 0 = Read only

1 = Read/write

9 Not Writable When Enabled 0 = Writable when enabled (for example, drive running)

1 = Not writable when enabled

10 Instance 0 = Parameter value is not a Reference to another parameter

1 = Parameter value refers to another parameter

11 Uses Bit ENUM Mask This parameter instance supports the Bit ENUM Mask attribute. For more

information, see the definition of the attribute.

12 Decimal Place (Bit 0) Number of digits to the right of the decimal point.

0000 = 0

1111 = 15

13 Decimal Place (Bit 1)

14 Decimal Place (Bit 2)

15 Decimal Place (Bit 3)

16 Extended Data Type (Bit 4) Right bit is least significant bit (16).

000 = Reserved

001 = DWORD used as an array of Boolean

010 = Reserved

011 = Reserved

100 = Reserved

101 = Reserved

110 = Reserved

111 = Reserved

17 Extended Data Type (Bit 5)

18 Extended Data Type (Bit 6)

19 Parameter Exists Used to mark parameters that are not available to network tools.

20 Not Used Reserved

21 Formula Links Indicates the Formula Data is derived from other parameters.

22 Access Level (Bit 1) A 3-bit field used to control access to parameter data.

23 Access Level (Bit 2)

24 Access Level (Bit 3)

25 Writable ENUM ENUM text: 0 = Read Only, 1 = Read/Write

26 Not a Link Source 0 = May be the source end of a link

1 = May not be the source end of a link

27 Enhanced Bit ENUM Parameter supports enhanced bit ENUMs.

28 Enhanced ENUM Parameter supports enhanced ENUMs.

29 Uses DPI Limits Object Parameter uses the DPI LImits Object.

30 Extended Descriptor Parameter uses Extended Descriptor bits, which can be obtained by reading

the DPI Extended Descriptor attribute for this parameter.

31 Always Upload/Download Parameter shall always be included in uploads and downloads.

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