RSTi-OM User Manual
Section 13
GFK-3212A
Jun 2021
Functionality Descriptions
141
RdWrControlType
USINT
Provides the control and type of ISDU request
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
Index
UINT
The parameter address of the data objects in the IO-Link
device.
Subindex
UINT
The data element address of a structured parameter of the
data objects 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
An array of
USINTs,
UINTs, or
UDINTs.
Data required for read commands. Optionally can return the
data of a write command.
The size of the array is determined by the Control field in the
RdWrControlType.
Note: Data field not required for single NOP commands.
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