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7.9 Commands and responses (Communication/Modbus)
7.9 Commands and responses (Communication/Modbus)
The E5AR/ER provides a set of command frames that make use of variable area read/write commands,
operation commands, and other services provided by the Modbus communication protocol.
E5AR/ER command frames are explained below.
■ Monitor value read (Communication/Modbus)
Command
Slave Function
address mode
Read start
address
Number of
elements
CRC-16
2
2
2 bytes
1
1
Address
H'0400
H'0402
H'0404
H'0406
H'0408
H'040A
H'040C
H'4400
H'4402
H'4404
H'4406
H'4408
H'440A
H'440C
Ch
1
2
Monitor value
Data name
Version
Modification type
PV
Internal SP
Bank No. monitor
PID Set No. monitor
Status
Version
Modification type
PV
Internal SP
Bank No. monitor
PID Set No. monitor
Status
Address
H'8400
H'8402
H'8404
H'8406
H'8408
H'840A
H'840C
H'C400
H'C402
H'C404
H'C406
H'C408
H'C40A
H'C40C
Ch
3
4
Monitor value
Data name
Version
Modification type
PV
Internal SP
Bank No. monitor
PID Set No. monitor
Status
Version
Modification type
PV
Internal SP
Bank No. monitor
PID Set No. monitor
Status
This command is used to read the PV, status, and other monitor
values. The number of elements can be set from H'0004 to 006A (4 to
106) to allow reading of monitor values in contiguous addresses.
When used in setting area 1, the response for the PV and internal SP
is "0" and the response for the status is as indicated in the notes in
"Appendix Setting list Status" (P.A-8).
Response
Slave Function
address mode
Byte
count
1
Data 1
Most significant Least significant
H’03
1
Read data
Data 1
1
Number of elements × 2 bytes
Data n
Data n
Most significant Least significant
CRC-16
2
The above indicates a normal end. For information on error responses,
see "7.5 Reading the variable area" (P.7-10).
7-17
Communication
(Modbus)
H’03