Emerson RSTi-OM - ISDU Blocking and Non-Blocking Methods; Single Command Blocking

RSTi-OM User Manual Section 13
GFK-3212A Jun 2021
Functionality Descriptions 142
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 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 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.
13.3.2 ISDU Blocking and Non-Blocking Methods
The IOLM supports both blocking and non-blocking ISDU requests. The following diagrams
demonstrate how each mode works.
Single Command Blocking
Figure 101: Illustrates the Single Command Blocking Method