Filter
Top Products
6 - 17
MELSEC-
A
6 SEQUENCE PROGRAM USED FOR POSITIONING CONTROL
* If the dedicated commands (RIRD, RIWT) are used when the QnACPU is used,
RY(n+7)E, RY(n+7)F are used with the dedicated commands, so the user must
make sure that this signal information is not rewritten.
Insert the following program at the end of the program.
When the QCPU (Q mode) is used, the following program is not required.
Read new information
of RYn0 to RY(n+7)F
Get RY(n+7)E,
RY(n+7)F status
Clear previous
information
Develop into Y170 to
Y17F
[3] Reading and writing the D75P2 buffer memory
This section explains the method of reading and writing the D75P2 buffer memory
using transient transmission.
(1) Outline
When reading and writing the D75P2 buffer memory, reading and writing are
carried out using the intelligent device station access request signal (RY(n+7)E)
and the intelligent device station access complete signal (RX(n+7)E).
The master station buffer memory uses the transmission/reception buffer.
TO (RIWT)
FROM (RIRD)
1) 2)
3)4)
PLC CPU Master station
D75P2 (1st station)
Buffer memory
Reception area
2nd station transmission/
reception area
Buffer memory
(Transmission/reception area)
Transmission area
...
1st station transmission/reception area
1) Data (control data + transmission data) is stored in the master station
transmission area.
2) When the intelligent device station access request signal (RY(n+7)E) turns
ON, the data stored in the transmission area is stored in the D75P2.
3) When the intelligent device station access complete signal (RX(n+7)E) turns
ON, the response is stored in the master station reception area.
4) The data (control data + reception data) is read from the master station
reception area.
POINT
When the dedicated commands RIWT/RIRD are used, the intelligent device station
access request signal (RY(n+7)E) and intelligent device station access complete
signal (RX(n+7)E) are controlled by the dedicated commands, so the user does not
need to establish an interlock.