Siemens SIDOOR ATD401W System Manual page 147

Device roles and provider-consumer model
IO Controller
A PROFINET IO controller has control over the field devices. The process data and alarms
arrive in the IO controller and are processed in the user program. In an automation system,
an IO controller is normally a programmable logic controller (PLC). The communication
channels are established by the IO controller during system startup.
IO supervisor
A PROFINET IO supervisor is an engineering station in a system, for example, that can have
temporary access to the field devices for commissioning purposes.
IO device
The PROFINET IO device is a process-oriented field device that is connected in a distributed
fashion. It expects the configuration from an IO controller/supervisor and cyclically transfers
its process data to the IO controller.
Provider-consumer model
During data exchange, PROFINET IO operates according to the provider/consumer model.
The provider provides the data and the consumer processes it. The SIDOOR ATD430W
controller is an IO device. If the IO controller's output data is invalid ("poor" output data
provider status), e.g. if the user program in the IO controller is stopped, then communication
in the internal SIDOOR bus is stopped. The corresponding response can be performed by
the master monitoring of the SIDOOR controller (see Section Master monitoring (Page 148)).
Figure 4-3
ATD4xxW Door Controller for Industrial Applications
System Manual, 01/2017, A5E38080677-AB
Provider-consumer model
Controllers
4.5 Relay and fieldbus interfaces
147