V02.00 | 2019/10
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8.6.7 The IO-Link function block IOL_CALL
The IO-Link function block IOL_CALL is specified in the IO-Link specification "IO-Link Integration
Part 1- Technical Specification for PROFIBUS and PROFINET“".
Depending on the PLC manufacturer, the IO-Link CALL function block can differ from the
specification (for example in the representation or the use of variables).
Fig.36: IOL_CALL in accordance with IO-Link specification
IOL_CALL– input variables
Designation
acc. IO-Link spec.
Data type Meaning
REQ BOOL A rising edge triggers the send command.
ID DWORD Address of the IO-Link master module
Step 7 Classic
n Start address of the input data of the IO-Link master mod-
ule.
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n older Siemens CPUs (e.g. CPU 315):
Start address of the input data of the IO-Link master mod-
ule.
n recent Siemens CPUs (e.g. CPU 1511):
HW identifier of the device's "Basic" slot
INDEX_CAP INT Function block instance: 247 to 254, 255
RD_WR BOOL 0 = read access
1 = write access
ENTITY_PORT INT Address of the IO-Link port to be accessed
FI_INDEX INT Fix value (65098): defines the access to be an IO-Link CALL
IOL_INDEX INT Number of the IO-Link index which has to be read
IOL_SUBINDEX INT Definition of a possible sub index.
LEN INT Length of the data to be read/written. This information is not
necessary for the Siemens IOL_CALL.
RECORD_
IOL_DATA
ANY Source/destination for the data to be read/written.
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