6 Commissioning
| “IO_LINK_CALL” function block
39
Manual Communication module UR20-4COM-IO-LINK
2547720000/03/09.2019
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IO-Link library, “IO_LINK_CALL” has been replaced by the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.
Содержание UR20 Series
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