Local/Master Operation - Siemens SIDOOR ATD4 W Series System Manual

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 162)).
Figure 5-3
5.5.4

Local/master operation

The slave (= SIDOOR control unit) generally signals via StatW1 (bit 9 = 1 "control requested") that
the master (= higher-level PLC on the fieldbus) should assume control. If the PLC signals via STW1
(bit 10 = 1 "control by the programmable logic controller") that it is taking over control, the
process data is deemed to be valid and must be processed accordingly. See Figure 5-4 Sequential
control state graph (Page 163).
If the PLC does not assume control (bit 10 = 0 "no control") or if the slave does not request control
(ZSW1 bit 9 = 0 "local operation"), the process data is discarded and the sequential control
ATD4xxW for industrial applications
System Manual, 06/2022, A5E51901827B AA
Consumer
Provider
Provider-consumer model
5.5 Relay and fieldbus interfaces
Provider
Consumer
Controllers
161