YOKOGAWA STARDOM FCN-RTU User Manual

<9. Advanced Engineering >
169
TI 34P02K35-02E
May 31, 2017-00
9.1.5 Inter-FCN/FCJ Communication Concept
The Inter-FCN-500, FCN-RTU Communication Function Block is used for
exchanging data between FCN/FCJs. This section describes inter-FCN/FCJ
communication – communication types, overview, selection criteria and related
precautions.
For details on inter-FCN/FCJ communication, see:
“Inter-FCN/FCJ Communication Function/Function Block” of
Logic Designer’s FB/FU online help documentation
The online help documentation also describes how to use system provided sample
programs for inter-FCN/FCJ communication.
● Types of Inter-FCN/FCJ Communication
Two types of inter-FCN/FCJ communications are available: confirmed
communication and unconfirmed communication. The required engineering is
different depending on which is selected.
Confirmed communication
In confirmed communication, responses for Read/Write requests are received
from the destination FCN/FCJ.
Unconfirmed communication
In unconfirmed communication, no response for Read/Write requests is received
from the destination FCN/FCJ.
In general, use unconfirmed communication for inter-FCN/FCJ communication
unless otherwise required for a specific application. The reasons and selection
criteria are described hereafter.
● Overview of Inter-FCN/FCJ Communication
To communicate between two FCN-500s or FCN-RTUs, first a connection is
established with the destination FCN/FCJ using a function block for connection.
After the connection is successfully established, data is sent and received via the
connection using function blocks for data access.
FCX02
Function block for
data access
Communication
data
Function block for
connection
FCX01
Function block for
data access
Communication
data
Function block for
connection
Connection
Function blocks for connection are required for both confirmed and unconfirmed
communications. Either the CONNECT or SD_FCS_CONNECT the function block
can be used for this purpose. However, between confirmed and unconfirmed
communications, the methods for sending and receiving data differ greatly and the
function blocks to be used for data access are also different.

YOKOGAWA STARDOM FCN-RTU Specifications

General

Brand	YOKOGAWA
Model	STARDOM FCN-RTU
Category	Controller
Language	English