Mitsubishi Electric FR-F820-00077 Instruction Manual page 665

Parameters
Read holding register (reading of data of holding registers) (H03 or 03)
● Query message
³ Slave address
(8 bits)
● Normal response (Response message)
³ Slave address
(8 bits)
● Query message setting
Message
³ Slave address
· Function
» Starting address
¿ No. of points
Tab. 5-244: Description of the query message
● Content of normal response
Message
´ Byte count
² Data
Tab. 5-245: Description of normal response
Example Read the register values of 41004 (Pr. 4) to 41006 (Pr. 6) from slave address 17 (H11).
Query message
Slave address
(8 bits)
Response message
Slave address
H11
(8 bits)
Read value
Register 41004 (Pr. 4): H1770 (60.00 Hz)
Register 41005 (Pr. 5): H0BB8 (30.00 Hz)
Register 41006 (Pr. 6): H03E8 (10.00 Hz)
FR-F800
· Function
H03
(8 bits)
· Function ´ Byte count
H03
(8 bits)
Description
Set the address to send messages to. Broadcast communication is not possible.
(Invalid when "0" is set.)
Set H03.
Set the address from which to start reading of data from the holding register.
Start address = start register address (decimal) – 40001
For example, when start register address 0001 is set, the data of holding register address
40002 is read.
Set the number of holding registers to read. Data can be read from up to 125 registers.
Description
The setting range is H02 to HFA (2 to 250).
Twice the number of reads specified by ¿ is set.
The amount of data specified by ¿ is set. Read data is output Hi bytes first followed by Lo
bytes, and is arranged as follows: data of start address, data of start address + 1, data of start
address + 2, and so forth.
Function
H11 H03
(8 bits) (8 bits)
Function Byte count
H03 H06
(8 bits) (8 bits)
(N) Operation via communication and its settings
» Starting address
H L
(8 bits) (8 bits) (8 bits)
H
(8 bits)
(8 bits) (8 bits)
Starting address
H03 HEB H00
(8 bits) (8 bits)
H17 H70 H0B
(8 bits) (8 bits) (8 bits)
¿ No. of points
H L
(8 bits) (8 bits)
² Data
L ...
(n × 16 bits) (8 bits)
No. of points CRC check
H03 H77
(8 bits) (8 bits)
Data
HB8 H03 HE8
(8 bits) (8 bits) (8 bits)
CRC check
L H
(8 bits)
CRC check
L H
(8 bits)
H2B
(8 bits)
CRC check
H2C HE6
(8 bits) (8 bits)
5 - 493