Weidmüller UR20-4COM-IO-LINK - 6 Commissioning; IO_LINK_CALL: output parameters; Variable table for IO_LINK_DEVICE (TIA portal); Reading and writing with IO_LINK_DEVICE in STEP7

6 Commissioning | “IO_LINK_CALL” function block
39Manual Communication module UR20-4COM-IO-LINK2547720000/03/09.2019
IO_LINK_CALL:outputparameters
Parameter Data type Description
DONE_VALID BOOL
Validity of data
0: Data invalid
1: Data valid
BUSY BOOL Read access / write access is executed
ERROR BOOL
0: no error
1: error and cancellation
STATUS DWORD Communication error message
IOL_STATUS DWORD IO-Link error message
RD_LEN DWORD Length of the data read
Processing of the function block lasts several PLC cycles.
The access, use of IO-Link port functions and the remaining
backup and recovery of device data must be controlled by
the user program.
SIEMENS offers the STEP7 IO-Link library for SIMATIC Man-
ager and the TIA Portal. In the more recent versions of the
IO-Link library, “IO_LINK_CALL” has been replaced by the
“IO_LINK_DEVICE” block.
Further information is available in the SIEMENS
document “Acyclic reading and writing with the
IO-Link library”.
You can download the SIEMENS IO-Link library
from the SIEMENS support website.
Reading and writing with “IO_LINK_DEVICE” in STEP7
You can read and write IO-Link device parameters using the
“IO_LINK_DEVICE” function block.
▶ Add the “IO_LINK_DEVICE” function block to the OB1 of
your user program.
▶ Create a new data block of type
ARRAY[0...231]ofBYTE.
This data block is the target range for data read and the
source range for data to be written.
▶ Generate a new variable table for the input parameters
and output parameters of the function block.
Variable table for “IO_LINK_DEVICE” (TIA portal)
▶ Assign the variables to the inputs and outputs of the
function block.
You can enter the parameters ID and CAP directly on the
function block.
“IO_LINK_DEVICE” function block (TIA portal)
▶ Create a watch and force table with the input parameters
and output parameters of the function block.
▶ Force the variables for the input parameters to the
required values.
In the case of S7-300/400 CPUs, use the logical
start address of the module inputs as ID.
In the case of S7-1200/1500 CPUs, use the hard-
ware address of the module as ID.