Rockwell Automation 20-750-DNET PowerFlex DeviceNet Option Module - Manual (Page 126)

126 Rockwell Automation Publication 750COM-UM002B-EN-P - October 2012
Appendix C DeviceNet Objects
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
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 = May be the sink end of a link
1 = May not be the sink end of a link
6 Not Recallable 0 = Recallable from NVS
1 = Not Recallable from NVS
7 ENUM 0 = No ENUM text
1 = ENUM text
8 Writable 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) 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 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.
Intelligent offline tools make use of the Limits Object to select limits and units.
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.