Mitsubishi QJ71E71-100 Series, Руководство пользователя

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MELSEC-Q
6 DEDICATED INSTRUCTIONS
Functions
(1) This instruction designates the target network number and target station number
of a station connected to an MELSECNET/H, MELSECNET/10 or Ethernet
network system in the control data and reads the data of designated word devices
of that station.
When reading the device data is completed, the completion device designated by
(D2) turns on.
QCPU
Ethernet module
READ
Channel 1
Channel n
Channel 8
Ethernet
Q/QnACPU
Ethernet module
(D1)
(S2)
[Local station] [Response station]
(2) Device data can be read from stations connected to either the MELSECNET/H,
MELSECNET/10 or Ethernet networks having the designated numbers, in addition
to stations connected to the local station's network.
(3) The data link instruction and instructions for the Ethernet network system cannot
be executed at two or more locations for the same channel.
If the execution conditions are met at two or more locations at the same time,
instructions to be executed later have to wait until the channel becomes available
because handshaking is automatically performed at the execution of the first
instruction.
(4) Whether the READ instruction is being executed or has been completed normally
or abnormally can be checked with the completion device (D2) or completion
status display flag ((D2) + 1) designated in the set data.
(a) Completion device (D2)
Turns on at the END processing of the scan where the READ instruction is
completed, and turns off at the next END processing.
(b) Status display device at completion ((D2) + 1)
Turns on and off depending on the completion status of the READ instruction.
Normal completion: Stays off and does not change.
Abnormal completion: Turns on at the END processing of the scan where
the READ instruction is completed, and turns off at
the next END processing.