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MELSEC-
A
6 SEQUENCE PROGRAM USED FOR POSITIONING CONTROL
(d) Using the FROM command
This is used to read the D75P2-designated buffer memory.
When the FROM command is used, the transmission buffer (master
module buffer memory) for the control data size, and the reception buffer
(master module buffer memory) for the read data size are used.
The data designated with the transmission buffer is read from the D75P2
buffer memory using the intelligent device station access request signal
and complete signal (RY(n+7)E and RX(n+7)E).
(Example) Reading the axis 1 speed limit value
Intelligent device station access
complete si
g
nal
(
RX
(
n+7
)
E
)
Intelligent device station access
request signal (RY(n+7)E)
Request for reading from
D75P2 buffer memory
FROM command
execution
Read process
complete
Completion of reading from
D75P2 buffer memory
Axis 1 machine
feed value
D75P2
Complete status
Bank 1 + M 200
H
Bank 1 + M 201
H
Bank 1 + M 203
H
Station No., request code
Control
data
Bank 1 + M 202
H
Bank 1 + M 204
H
(Reception buffer)
Dummy area
Bank 1 + M 0
H
Bank 1 + M 1
H
Bank 1 + M 3
H
Station No., request code
Transmission buffer
write data size (byte)
Quantity
Access code, attribute
Buffer memory address
Number of read points
(word)
Control
data
Bank 1 + M 2
H
Bank 1 + M 4
H
Bank 1 + M 5
H
Bank 1 + M 6
H
Master module
(Transmission buffer)
802(322
H
)
Address
Address
Number of read data
(byte)
Read
data
Axis 1 machine feed value
803(323
H
)
1
2