Integer (16-Bit Word) Isdu Request Command Format; Isdu Response Message Format; Standard Isdu Response Command Format - Emerson RSTi-OM User Manual

RSTi-OM User Manual
GFK-3212A

Integer (16-Bit Word) ISDU Request Command Format

This table shows an integer (16-bit word) ISDU request command format with an SLC, MicroLogix,
PLC-5, or Modbus/TCP.
Name
Byte Swapping /
RdWrControlType
Index
Subindex
Datalength
Data

ISDU Response Message Format

Standard ISDU Response Command Format

The following table shows the standard ISDU response command format with ControlLogix PLCs.
Name
Status
Functionality Descriptions
Data Type Parameter Description
Provides the control, type, and byte swapping 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 =
UINT 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.
The parameter address of the data objects in the IO-Link
UINT
device.
The data element address of a structured parameter of
UINT
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 field in
USINTs,
RdWrControlType.
UINTs, or
Note: Data is valid only for write commands.
UDINTs.
Data Type Parameter Description
Indicates the byte alignment and status of the command
response.
Byte swapping, bits 0-3:
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.
USINT
Status, bits 4-7:
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
Section 13
Jun 2021
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