Overview Of Explicit Message Communications; Temperature Controller; Explicit Message Communications - Omron E5ZN-DRT Operation Manual

Overview of Explicit Message Communications

6-1

Overview of Explicit Message Communications

6-1-1

Explicit Message Communications

Reading/Writing

Temperature Controller

Variable Area Data and
Sending Operation
Commands
Reading/Writing
Maintenance Information
for the DeviceNet
Communications Unit and
Temperature Controllers
90
Explicit message communications is a communications protocol for sending
commands from the master as explicit messages, and receiving explicit mes-
sages as responses from the nodes that receive the commands.
Explicit messages can be sent from the master to the DeviceNet Communica-
tions Unit to read and write the Temperature Controller variable area, send
operation commands, and read and write various other functions supported
by the DeviceNet Communications Unit.
Explicit message communications can be used to send and receive data that
is not allocated in the IN and OUT Areas due to word size restrictions, and
data that does not require the frequent refreshing used by the IN Area and
OUT Area.
Use either of the following two methods depending on the application.
Send Compoway/F communications commands to Temperature Controllers
by embedding them in explicit messages.
Send explicit messages to the DeviceNet Communications Unit.
Master
(PLC)
CompoWay/F communications
command sent to Temperature
Controller (embedded in
explicit message)
E5ZN-DRT
DeviceNet Communications Unit
Note This manual describes the contents of explicit messages that can be sent to
DeviceNet Communications Units. For details on the methods of sending
explicit messages, refer to the operation manual for the DeviceNet Unit being
used as the master.
DeviceNet Unit
Explicit message sent
to DeviceNet
Communications Unit
Slave Slave
Unit Unit
0 1
CompoWay/F
communications
command
Conversion
Section 6-1
CPU Unit
IOWR or
CMND
instruction
E5ZN
Temperature Controller
Unit
15