Beckhoff DeviceNet slave device  - CouplerState

The CouplerState provides information on the terminal bus communication of the Beckhoff Bus Coupler. This information is available for Beckhoff BK52x0 Bus Couplers, devices from the IPxxxx-B520 IP Box-family and the IP Link family.

Beckhoff DeviceNet slave device  - CouplerState 1:
CouplerState in the TwinCAT tree

CouplerState

0x00 = I/O Run
0x01 = I/O Error (KBus, IO or Terminal Error)
0x80 = I/O idle mode / fieldbus error, no output data are written
0x08= diagnostic information for an analog/special function terminal is pending. This function first hast to be activated at the couplers. The diagnostic data can then be read in the associated registers of the terminals, IP/IL modules