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IO-Link Master with EtherCAT Interface DataLine 8 Ports IP 65 / IP 66 / IP 67
67
>
9.3.6
Read and write cyclic process data
34217
► To check the validity of the cyclic process data, evaluate the PQI byte (→
Mapping: Port
Qualifier (0xF101)
(
Even with an interruption of the fieldbus connection the PQI byte indicates that the process
data is valid. This can have unintended impact on the control process.
► Take suitable measures to detect an interruption of the fieldbus connection.
They cyclic process data of the IO-Link-Ports X01...X08 is accessible via the following index groups:
Name (Index)
Description
Reference
IO-Link inputs (0x6000)
Cyclic input data at the IO-Link ports X01...X08 →
IO-Link Inputs (0x6000)
(
→ S.
IO-Link outputs (0x7000)
Cyclic output data at the IO-Link ports
X01...X08
→
IO-Link Outputs (0x7000)
(
→ S.
In operating mode "Digial Input (DI)" the digital process value of the IO-Link port will be
mapped to the first byte of the input data (sub-index 0x01).
In operating mode "Digial Output (DO)" the digital process value of the IO-Link port will be
mapped to the first byte of the output data (sub-index 0x01).
Valid values:
0x000 = OFF
0x001 = ON
During the configuration of the fieldbus slots TwinCAT automatically creates variables for the cyclic
input and output data. They are found in groups in the folders under the respective fieldbus modules.
The user can link the variables directly with the elements of a global variable list (GVL).
The following variables are created:
Group > Variable Variable
Description
[TxPDO]
[input byte n]
Byte n of the cyclic input data of the fieldbus module
[RxPDO]
[output byte m]
Byte m of the cyclic output data of the fieldbus module
n = 0...(max. number of bytes on configured input data)-1
m = 0...(max. number of bytes on configured output data)-1