Batch Read (Command: Er) - Mitsubishi Electric MELSEC IQ-R series Reference Manual

Batch read (command: ER)

Read extended file register (R) in 1-point units.
Message format
The following shows the message format of the request data and response data of the command.
■Request data
E R
Message wait Head device No.
45 52
H H
■Response data
The value of read device is stored in word units. (Page 74 Read data, write data)
Data specified by request data
■Command
ACPU common
E R
45 52
H H
■Message wait
Specify the delayed time of the response transmission. (Page 347 Message wait)
■Head device No.
Specify the block number and device number of head device with 7 digits. (Page 374 Device number)
■Number of device points
Convert the numerical value to 2-digit ASCII code (hexadecimal), and send it from the upper digits.
Specify the number of device points within the following range:
• 1  Number of device points  64
• Head device No. + Number of device points - 1  Maximum device No.
Communication example
Read data of 2 points (R8190 and R8191) of block number 12 under the following conditions.
• Message wait: 0 ms
• Block number: 12
• Head device: R8190
• Number of device points: 2 points (2 words)
(Request data)
Message wait
Head device No.
E R 0 1 2 R 8
45 52 30 31 32 52 38
H H H H H H H
(Response data)
Data read
1 2 3 4 7 A B C
(Decimal : 4660) (Decimal : 31420)
31 32 33 34 37 41 42 43
H H H H H H H H
(R8190 in NO.12) (R8191 in NO.12)
Number of device points
(Number of words)
Number of device points
(Number of words)
1 9 0 0 2
31 39 30 30 32
H H H H H
17 COMMUNICATING USING 1C FRAMES
17.5 Read and Write Extended File Register
17
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