Omron PROFINET NX-PNC202 User Manual page 38

1 PROFINET IO Technology
i
 IO Controller
A PROFINET IO Controller is the central device in the PROFINET network. It has the control over
the state of the network and processes the data and alarms. The IO Controller typically is a PLC Unit
that processes the data and alarms in the user program. It establishes the connection to the devices
on the network during system start-up.
 IO Supervisor
A PROFINET IO Supervisor is an optional device in the network, which has temporary access to the
field devices. It is typically an engineering station for monitoring or commissioning of the system.
 IO Device
A PROFINET IO Device is a remotely connected field device, close to the manufacturing process. It
is configured by the IO Controller to cyclically interchange process data with the IO Controller. The
IO Device can have multiple connections to different IO Controllers / IO Supervisors in the network
and will generate alarms if problems occur with the communication or the manufacturing process.
 Device Model
The PROFINET IO application layer describes the modules of an IO Device in a similar way as for
PROFIBUS DP. A PROFINET IO Device consists of slots for which the modules/submodules can be
inserted. The technical data concerning the slots and subslots are defined in the GSDML file of a
device.
 Slot
A Slot is the physical place of insertion of a module in an IO Device. Various subslots are located in
the various slots, which contain data for cyclic data exchange.
 Subslot
Subslots provide an additional addressing layer. They enable grouping of similar channels within a
slot. Each slot has to comprise at least one subslot with [1:n] IO channels.
 Index
The index specifies the data related to a specific subslot, to be read or written acyclically.
The device model is shown in the following graph:
1 - 4
NX-series PROFINET Coupler Unit User's Manual (W623)