Interbus Error (ILIB0001): The number of CR-enabled Interbus devices ... exceeds the maximum of ... .
The number of connectable INTERBUS devices which support the Peripherals Communication Protocol (PCP), i.e., the number of Communication References (CRs) an INTERBUS master can handle, is limited. The maximum value depends on the master type and is specified in the device description.
In your project too many PCP devices (with enabled CR) are inserted under the INTERBUS master.
The maximum number is mentioned in the error message and can be found in the properties page of the INTERBUS master.
Background information: Peripherals Communication Protocol (PCP) and Communication Reference (CR)
The Peripherals Communication Protocol (PCP) takes over the transmission of parameterization data via the INTERBUS parameter channel. Parameterization data is acyclic data that is only transmitted when required.
The logical connections configured in a communication relationship list ensure a smooth data exchange between two communication partners. The connection parameters (context conditions) of both communication partners are checked verified before an information exchange. This is done during a connection setup.
Each permitted communication relationship contains a number, the communication reference number (CR). This way, each communication relationship is uniquely identified so that the individual devices can be distinguished.
The INTERBUS master numbers the devices automatically when the INTERBUS system is initialized. It assigns the numbers starting from 2 in the order of the physical bus structure.
The CR must therefore be unique for each INTERBUS module and all CRs must be assigned without gaps.
Remedy
Reduce the number of PCP devices in your project.
If possible for a device, you can alternatively disable the CR.