Introduction; Message Service Specifications; Message Service Functions - Omron SYSMAC 3G8F7-CLK13-E Operation Manual

Introduction

6-1

Introduction

6-1-1

Message Service Specifications

6-1-2

Message Service Functions

Functions
Sending Messages
ClkSendFins library func-
tion
(See note.)
Receiving Messages
ClkRecvFins library func-
tion
Note
92
A message service is a command/response system used for data transmis-
sion between nodes on a network, i.e., computer to computer, PC to com-
puter, or computer to PC. The message service can also be used to control
operations, such as mode changes. The message service is implemented by
executing from the user program the library functions for sending or receiving
messages.
Communications from an computer are executed according to the specifica-
tions shown in the following table.
Item
Direction of transmission
Data length
Data content
FINS commands can be sent to specified nodes and FINS responses can be
received by executing C library functions from the user program to send and
receive messages.
This library function and driver call send command/response data.
Can be issued with respect to any Units at a PC, or to the Support Board or user
program at a computer.
Mainly used for sending FINS commands and responses. The FINS commands
and responses enable various types of control, and allow the status to be read.
Fixed-format data is prepared by the program and sent by executing clksend.
No special program is required at the receiving end if FINS commands and
responses supported by the receiving Unit are used.
When sending data to the computer with a user program, a program that can pro-
cess the received data is required.
When a response to a command is returned, a program for reading and analyzing
the response is required.
These library functions and driver call receive command/response data.
Data received by the Controller Link Support Board is read.
Mainly used for receiving FINS commands and responses. The FINS commands
and responses enable various types of control, and allow the status to be read.
Data is received by executing clkrecv, and it is analyzed by the program according
to a fixed format.
A program is required for analyzing the data that is received.
A program is required for preparing and sending responses when commands
requesting responses are received.
Using ClkSendFins or ClkRecvFins to send the "MEMORY AREA READ" and
"MEMORY AREA WRITE" FINS commands for PCs is equivalent to execut-
ing the SEND and RECV ladder-diagram instructions.
Specifications
1:1 Message transmission or reception
1:N Message transmission (broadcast)
2,012 bytes max. (including FINS header)
Any command/response data can be sent or received.
Depends on the message being sent.
Features
Section 6-1