Comtrol IO-Link Master EIP-4 - Manual (Page 28)

28 - Chapter 2. Functionality Descriptions IO-Link Master EtherNet/IP Reference Manual: 2000589 Rev. A
Integer (16-Bit Word) ISDU Response Command Format
2.2.3.2. Integer (16-Bit Word) ISDU Response Command Format
The following table shows an integer (16-bit word) ISDU response command format with SLC, MicroLogix,
PLC-5, or Modbus/TCP.
Name Data Type Parameter Descriptions
Status,
Byte-Swapping,
RdWrControlType UINT
Indicates the control, type, byte swapping and status of the
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
Byte swapping, bits 8-11:
0= No byte swapping.
1= 16-bit (INT) byte swapping of TX/RX ISDU data.
2= 32-bit (DINT) byte swapping of TX/RX ISDU data.
Status, bits 12-15:
0 = NOP (No operation)
1 = In process (Only valid for non-blocking requests)
2 = Success
3 = Failure: IO-Link device rejected the request.
4 = Timed out: IO-Link device did not respond
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 that was read or written.
For nested batch commands, the data length can vary from 1 to
fixed data area size.
Data
Array of
USINTs,
UINTs, or
UDINTs
Data returned for read commands. Contains the data of a write
command.
The size of the array is determined by the Control field in
RdWrControlType.
Note: Data field not required for single NOP commands.