IO-Link Port Configuration on a Balluff Modbus TCP IO-Link master module is located in specific Modbus register for each M12 port.  There are 6 Modbus registers for each M12 port on the Balluff IO-Link master, starting at the following Modbus registers:

9100-9105 for Port X01

9200-9205 for Port X02

9300-9305 for Port X03

9400-9405 for Port X04

9500-9505 for Port X05

9600-9605 for Port X06

9700-9705 for Port X07

9800-9805 for Port X08

The Modbus registers are broken down to the following.  The 'n' represents each port on the IO-Link Modbus TCP master.

9n00 Byte 0 is the Master Cycle Time, Byte 1 is reserved

9n01 Byte 0 configures Pin 2 Port Mode.  A value of 0 deactivates the port.  A value of 1 sets up Pin 2 as a Digital Input.  A value of 2 sets up Pin 2 as a Digital Output.

9n01 Byte 1 configures Pin 4 Port Mode.  A value of 0 deactivates the port.  A value of 1 sets up Pin 4 as IO-Link manual.  A value of 2 sets up Pin 4 as IO-Link auto start.  A value of 3 sets up Pin 4 as a Digital Input.  A value of 4 sets up Pin 4 as a Digital Output.

9n02 Byte 0 configures the Validation ID Type on the Port.  A value of 0 sets up No Device Check.  A value of 1 sets up the port to be Compatible V1.0 IO-Link device. A value of 2 sets up the port to be Compatible V1.1 IO-Link device.  A value of 3 sets up the Port for Backup and Restore.  A value of 4 sets up the Port for Restore.

9n03 is the Vendor ID of the IO-Link device.  This is used when Validation ID is setup for a device check and backup and restore features of the IO-Link device.

9n04 Byte 0 is used for the most significant byte (MSB)  of the Device ID of the IO-Link device.

9n04 Byte 1 is the second byte of the Device ID of the IO-Link device.

9n05 is used for the least significant byte (LSB) of the Device ID of the IO-Link device.

An example to enable the IO-Link port 01 on the Modbus TCP IO-Link master would be use Modbus Function 16 – Write Multiple Register command to write a value of 0x0202 hex to Modbus address 9101.  This will set Pin 2 Port Mode to be a Digital Output and Pin 4 Port Mode to be setup as IO-Link Auto start. The LED on Pin 4 of the IO-Link Master module will turn flashing green when the port is enabled for IO-Link.  The LED will turn solid green when there is an IO-Link device connected and communicating to the IO-Link Master module. 

To do the same for Port 2, Function 16 – Write multiple register command can be sent to Modbus register 9201 with a value of 0x0202 to setup the second port X02 as IO-Link on Pin 4 and digital output on Pin 2. 

In Auto Start mode, the IO-Link process data from the sensor is automatically sent to the Modbus TCP IO-Link master.  

To setup IO-Link device parameter backup and restore, the following Modbus register can be written to:  9n01, 9n02, 9n03, 9n04 and 9n05.

The following example is used, where a Balluff discrete IO hub – BNI007Z is in Port X01.  The webserver of the Modbus TCP IO-Link master can be used to read the IO-Link vendor ID and device ID values to be entered into the Modbus registers.

Modbus Function 16 – Write Multiple Register would be used to write to the five registers:

9101 Pin 4 Port Mode – 0x0102 - IOL Manual

9102 Validation – 0x0003 – Backup and Restore

9103  Vendor ID – 0x0378 – Balluff

9104 Device ID MSB – 0x0005

9105 Device ID LSB – 0x0B00

Once the matching vendor ID and Device ID information is setup, the IO-Link port will backup and restore the IO-Link parameters.  If the vendor ID and device ID does not match up, the IO-Link port will flash red.

The configuration can be checked and verified on the webserver of the Modbus TCP IO-Link master module as well, under the Settings - Port.