Commands And Responses; Reading Monitor Values - Omron E5AR-T User Manual

Section 7 Modbus Communications

7.9 Commands and Responses

The E5AR-T/ER-T provides a set of commands that read from variable areas, write to variable areas,
execute operation commands, and execute other services provided by the Modbus communications
protocol. The commands supported by the E5AR-T/ER-T are described below.

■ Reading Monitor Values

Command
Response
7-20
Slave Function Read start
Number of
address code address
elements
H'03
1 1 2
Monitor value
Address
Ch Data name
H'0404 PV
H'0406 Present Set Point
PID Set Number
H'040A
Monitor
1
H'040C Status
H'040E Program Status
Alarm Set Number
H'0410
Monitor
H'4404 PV
H'4406 Present Set Point
PID Set Number
H'440A
Monitor
2
H'440C Status
H'440E Program Status
Alarm Set Number
H'4410
Monitor
This command is used to read the present values, status, and other
monitor values. The number of elements can be set from H'0004 to
006A (4 to 106) to allow reading monitor values in consecutive
addresses.
When used in setting area 1, the response for the present value and
internal SP will be 0 and the response for the status will be as
indicated in the notes in E5@R-T Status (Communications) in
Appendix Setting Lists (P. A-8).
Slave Function Byte Read data
address code count Data 1
H'03 Most significant Least significant
1 1 1 Number of elements 2 bytes
Data n
Most significant Least significant
The response for a normal end is shown above. For information on
error responses, refer to 7.5 Read from Variable Area (P. 7-11).
CRC-16
2 2
Monitor value
Address
Ch
H'8404 PV
H'8406 Present Set Point
PID Set Number
H'840A
Monitor
3
H'840C Status
H'840E Program Status
Alarm Set Number
H'8410
Monitor
H'C404 PV
H'C406 Present Set Point
PID Set Number
H'C40A
Monitor
4
H'C40C Status
H'C40E Program Status
Alarm Set Number
H'C410
Monitor
Data 1
Data n CRC-16
2
Data name