Overview; Outline Of Message Communications - Omron CS1W-DRM21 Operation Manual

Overview

6-1

Overview

6-1-1

Outline of Message Communications

Message communications functions
138
Message communications enable messages to be set between nodes on a
DeviceNet network when required by system conditions. The messages can
be sent between PLCs, between an OMRON PLC and a master made by
another company, or between slaves. They can be used to send/receive data;
read time data, error histories, and other data; or control operation, e.g., by
force-setting/resetting bits.
There are two types of messages: FINS messages and explicit messages.
Item FINS messages
Outline Message communications for
OMRON products that use the
FINS protocol.
Remote OMRON PLCs (with a CS/CJ-
device series DeviceNet Unit)
Features Provide a greater range of services
than explicit messages by sending
and receiving FINS commands.
Have message compatibility with
other OMRON networks, such as
Controller Link, SYSMAC LINK,
and Ethernet (up to 3 levels)
FINS communications function
Explicit message
communications function
Section 6-1
Explicit messages
General-purpose message com-
munications using the DeviceNet
protocol.
Other manufacturer masters or
slaves.
OMRON PLCs with C200H or
CVM1/CV-series DeviceNet Master
Unit or CS/CJ-series DeviceNet
Units
OMRON PLCs with C200H I/O
Link Units
Enable message communications
with DeviceNet devices from other
manufacturers.
Can receive explicit messages
from OMRON PLCs with C200H-
or CVM1/CV-series DeviceNet
Master Units and can send explicit
messages to OMRON PLCs with
C200H I/O Link Units
Send
Receive
Send
Receive