Omron K7DD User Manual page 120

7 Communications
Types of Communications Commands
The following three types of communications commands are available for the K7DD.
Communications command
Read Variable Area
Write Variable Area
Operation Command
The K7DD has an internal register called the "variable area", where
the measurement values, status information, and setting parameters
for each channel are assigned.
The Read Variable Area Command is used to read the measurement
values, status information, and setting parameters. The Write
Variable Area Command is used to write the setting parameters.
The Operation Commands are used to execute software resets,
parameter initialization, etc. for K7DD without accessing the variable
area.
Refer to 7-6 Modbus RTU Communications Format (P.7-9) for
information on the command frame/response frame configuration.
7 - 4
Reads the variable area.
Writes the variable area.
Executes the following operations for the K7DD.
• Software resets
• Parameter initialization
• Transition to operation stop status
• Alarm latch cancel
Power Line Data Generator User's Manual (N233)
Description
Host system
Write
Operation
Variable
Command
Area
Micro-
computer
Variable area
K7DD
Read
Variable
Area