150 Rockwell Automation Publication 750COM-UM009A-EN-P - May 2017
Appendix D EtherNet/IP Objects
Table 52 - DPI Parameter Object: Descriptor Attributes
Bit Name Description
0 Data Type (Bit 1) Right bit is least significant bit (0).
000 = USINT used as an array of Boolean
001 = UINT used as an array of Boolean
010 = USINT (8-bit integer)
011 = UINT (16-bit integer)
100 = UDINT (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
1Data Type (Bit 2)
2Data Type (Bit 3)
3 Sign Type 0 = unsigned
1 = signed
4 Hidden 0 = visible
1 = hidden
5 Not a Link Sink 0 = Can be the sink end of a link.
1 = Cannot be the sink end of a link.
6 Not Recallable 0 = Recallable from NVS
1 = Not Recallable from NVS
7ENUM 0 = No ENUM text
1 = ENUM text
8Writable 0 = Read only
1 = Read/write
9Not 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) Bit 16 is the least significant bit.
000 = Reserved
001 = UDINT 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 that the Formula Data is derived from other parameters.
22 Access Level (Bit 1) A 3-bit field that is used to control access to parameter data.
23 Access Level (Bit 2)
24 Access Level (Bit 3)