SMC Networks LECSN-T Series User Manual

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20．PROFINET COMMUNICATION
The following table shows explanation of terms applied to PROFINET standard used in this manual.
Term
Explanation
PROFINET (PROFINET IO)
PROFINET has two application types: PROFINET IO and PROFINET CBA. This product is
compatible with PROFINET IO. PROFINET IO is based on a communication between upper sides
and other devices. PROFINET CBA is based on a communication between upper sides with
components.
PROFIdrive
This is an application profile defined with PROFINET and PROFIBUS for electric-powered drives
such as drivers. The communication data format and functional range are provided.
RT, IRT
These are the communication methods of Process Data (cyclic communication) for PROFINET IO.
RT means Real-Time (asynchronous communication) and IRT means Isochronous Real-Time
(synchronous communication).
Process Data
This is the name of cyclic communication data (Cyclic Data Exchange) for PROFINET
communication. This is also called I/O data. The data format of cyclic communication is called
Telegram in this manual.
Acyclic communication
(Acyclic Data Exchange)
This is the name of acyclic communication (request/response pattern) for PROFINET
communication.
GSD file
This is the XML format file (GSDML file) of communication specifications and characteristics
supported with this product. Use this when you set up this product (selection of Telegram and setting
of transmission cycle) with the PROFINET configuration tool.
PNU
This is an abbreviation for parameter number used in PROFINET communication. The network
variables used in PROFINET communication are described as PROFIdrive parameters and the
parameters of drivers are described as parameters (or servo parameters). The PROFIdrive
parameters are described as follows.
Example) PROFIdrive parameter 922 → P922
Array [n]
The PROFIdrive parameter whose Data Type is "Array [n]" is in an array structure and subindex (Sub)
will be used to access each element in the array. The subindices of PROFIdrive parameters are
described as follows.
Example) PROFIdrive parameter 980, subindex 2 → P980.2
AR, CR
These are AR (Application Relationship) and CR (Communication Relationship). AR is established
between the upper side and device. Each CR (IO CR for cyclic communication and Record Data CR
for acyclic communication) in AR will transmit/receive data.
R, W, R/W
The following shows description of Access.
R: Readable
W: Writable
R/W: Readable and writable

SMC Networks LECSN-T Series Specifications

General

Brand	SMC Networks
Model	LECSN-T Series
Category	Controller
Language	English