Comtrol IO-Link Master EIP-4 - Manual (Page 26)

26 - Chapter 2. Functionality Descriptions IO-Link Master EtherNet/IP Reference Manual: 2000589 Rev. A
Integer (16-Bit Word) ISDU Request Command Format
2.2.2.2. Integer (16-Bit Word) ISDU Request Command Format
This table shows an integer (16 bit word) ISDU request command format with a SLC, MicroLogix, PLC-5, or
Modbus/TCP.
Name Data Type Parameter Description
Byte Swapping /
RdWrControlType
UINT
Provides the control, type and byte swapping 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 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
Bits 8-11:
0= No byte swapping.
1= 16-bit (INT) byte swapping of ISDU data.
2= 32-bit (DINT) byte swapping of ISDU data.
Bits 12-15:
Set to zero. Unused.
Index UINT The parameter address of the data object in the IO-Link device.
Subindex UINT
The data element address of a structured parameter of the data
object in the IO-Link device.
Datalength UINT
Length of data to read or write.
For nested batch commands, the data length can vary from 1 to the
fixed data area size.
Data
Array of
USINTs,
UINTs, or
UDINTs.
Size of array is determined by the Control field in
RdWrControlType.
Note: Data is valid only for write commands.