Rockwell Automation 20-COMM-D DeviceNet Adapter Series B FRN 2.xxx - Manual (Page 151)

Using Explicit Messaging 6-23
20-COMM-D DeviceNet Adapter User Manual
Publication 20COMM-UM002G-EN-P
Table 6.L Example Scattered Read Request Data
Figure 6.25 Example Scattered Read Request Data File
Address
Value
Description Hex. (1)
(1) In RSLogix 5 software, leading zeros are not displayed in data file addresses. For example, ‘0024’ in address
N30:1 is shown as ‘24’.
Dec.
N30:0 0101 257 TXID = 01, Command = 01 (execute)
N30:1 0024 36 Port = 00, Size = 36 bytes (2)
(2) The maximum number of bytes that can be entered is 120 (78 Hex.), which represents 19 parameters. The
number of required bytes always includes 2 for the Class, 2 for the Instance, 2 for the Attribute, 2 for each
parameter being read, and 4 for each parameter value (2 bytes for the Least SIgnificant Word and 2 bytes for the
Most Significant Word). For this example where 5 parameters are being read, a value of 36 bytes is required.
N30:2 4B01 19201 Service = 4B (Get_Attribute_Single), Address = 01 (Node)
N30:3 0093 147 Class = 93 (DPI Parameter Object)
N30:4 0000 0 Instance = Class Attributes (drive)
N30:5 0000 0 Attribute = 0 (Parameter Value)
N30:6 0001 1 Parameter Number Read = 1 [Output Freq]
N30:7 0000 0 Pad Word = 0 (always zero)
N30:8 0000 0 Pad Word = 0 (always zero)
N30:9 0003 3 Parameter Number Read = 3 [Output Current]
N30:10 0000 0 Pad Word = 0 (always zero)
N30:11 0000 0 Pad Word = 0 (always zero)
N30:12 0006 6 Parameter Number Read = 6 [Output Voltage]
N30:13 0000 0 Pad Word = 0 (always zero)
N30:14 0000 0 Pad Word = 0 (always zero)
N30:15 000C 12 Parameter Number Read = 12 [DC Bus Current]
N30:16 0000 0 Pad Word = 0 (always zero)
N30:17 0000 0 Pad Word = 0 (always zero)
N30:18 0011 17 Parameter Number Read = 17 [Analog In2 Value]
N30:19 0000 0 Pad Word = 0 (always zero)
N30:20 0000 0 Pad Word = 0 (always zero)