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RSTi-OM User Manual
GFK-3212A
Standard ISDU Request Command Format
This table displays a standard ISDU request command format with ControlLogix PLCs.
Name
Byte Swapping
RdWrControlType
Index
Subindex
Datalength
Data
Functionality Descriptions
Data Type
Parameter Descriptions
Bits 0-3:
0= No byte swapping.
1= 16-bit (INT) byte swapping of ISDU data.
USINT
2= 32-bit (DINT) byte swapping of ISDU data.
Bits 4-7:
Set to zero. Unused.
Provides the control and type of ISDU command.
Bits 0-3, Type Field:
0 = NOP (No operation) 1 = Read operation
2 = Write operation 3 = Read/Write "OR"
4 = Read/Write "AND"
Bits 4-7, Control Field:
0 = Single/Last Operation (length can vary from to
1 to 232) 1 = Nested batch command – fixed 4
USINT
byte data area
2 = Nested batch command – fixed 8-byte data
area 3 = Nested batch command – fixed 16 byte
data area 4 = Nested batch command – fixed 32
byte data area 5 = Nested batch command – fixed
64 byte data area
6 = Nested batch command – fixed 128 byte data
area 7 = Nested batch command – fixed 232 byte
data area
The parameter address of the data objects in the
UINT
IO-Link device.
The data element address of a structured
UINT
parameter of the data objects in the IO-Link
device.
Length of data to read or write.
UINT
For nested batch commands, the data length can
vary from 1 to the fixed data area size.
An array of
The size of an array is determined by the Control
USINTs,
field in RdWrControlType.
UINTs, or
Note: Data is valid only for write commands.
UDINTs.
Section 13
Jun 2021
139
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