ISDU configuration address description
The IO-Link master supports two ways to set a slave's ISDU parameters: one is parameter read/write via addresses (Modbus-TCP or S7-TCP), supporting a maximum of 32 bytes; the other is parameter read/write via the IO-Link Device Tool (downloadable from the official website), supporting read/write of up to 232 bytes of data.
Set via data address
When setting the slave's ISDU parameters using Modbus-TCP or S7-TCP addresses, a maximum of 32 data items can be read or written. When the IO-Link master coupler's interface is set to IO-Link and connected to an IO-Link slave, the parameter configuration data addresses correspond as shown in the table below:
| Input | |||
| Parameter Name | Description | Data Type | Byte order |
| Port | Select the port to configure (decimal) | Word | 1-2 |
| Index | ISDU index | Word | 3-4 |
| Subindex | ISDU sub-index | Byte | 5 |
| Parameter length | Data width (max 32 bytes) | Byte | 6 |
| Write | Write (set to 1 to take effect) | Byte | 7 |
| Read | Read (set to 1 to take effect) | Byte | 8 |
| Byte0~byte31 | IO-Link slave function | Byte | 9-40 |
| Output | |||
| Parameter Name | Description | Data Type | Byte order |
| Success status | Port status after successful write or read (displays 1 after successful configuration) | Word | 1-2 |
| Functional status | Slave function status after write or read | Byte | 3-34 |
IO-Link Device Tool settings
When using the IO-Link Device Tool for ISDU data read or write, a maximum of 232 data reads or writes are supported.
