Functionality A PROFINET Controller opens a separate connection (AR = Application Relation) to each individual PROFINET Device for the purpose of data exchange, parameterization, and diagnosis. The de

Establishing a Connection The connection is established in several steps By means of a DCP identify request, the controller scans the network for a PROFINET Device with the defined station name. The c

PROFINET Diagnosis This chapter describes how the diagnosis mechanisms from PROFINET can be used in CODESYS . The detection and correction of system-related malfunctions (for example, caused by firewa

Alarms In the case of a change to the entries of the diagnosis database, the PROFINET Device sends an alarm to the PROFINET Controller. This immediately signals the coming or going of a malfunction. T

Validity of I/O Data For both incoming and outgoing data, PROFINET devices (Controller and Device) send a status byte in submodule granular form, which marks the I/O data as valid or invalid. From an

Module/Submodule Status The SubmoduleState is a status word that indicates for each individual submodule the presence of diagnosis entries or other malfunctions such as a corrupt configuration. In thi