Ethercat State Machine - IFM Electronic Ecomat 300 AL1030 Device Manual

IO-Link Master EtherCat
In this context, the structural context of the device is as follows:

18 EtherCat State Machine

The device is provided with a state machine, the EtherCat State Machine
(ESM) The EtherCat master sends requests about status changes to the
AL Control Register of the slave The slave shows the current state in the AL
Status Register and provides continuing error codes in the AL Status Code
Register
30