Details Of Input/Output Signals - Mitsubishi MELSEC AJ65BT-R2 User Manual

3 SPECIFICATIONS

3.6.2 Details of input/output signals

Device No. Signal name
Transmission normal
RXn0
complete
Transmission error
RXn1
complete
Reception normal
RXn2
read request
Reception error read
RXn3
request
Initialization normal
RXn4
complete
Initialization error
RXn5
complete
A detailed explanation of the R2 input/output signals is given below.
The lines in the timing chart indicate the following details.
(1) Remote input (RX)
When transmitting data to an external device connected to R2, after the transmission
data is written into the R2 transmission area, the transmission request (RYn0) is
turned ON.
When the transmission is completed normally, transmission normal complete (RXn0)
turns ON, and if the transmission is completed abnormally, transmission error
complete (RXn1) turns ON.
The transmission request (RYn0) turns OFF when these signals turn ON.
Transmission request (RYn0)
Transmission normal complete
or Transmission error complete
When data is received from an external device connected to R2 and the transmission
is completed normally, reception normal read request (RXn2) turns ON. If the
transmission is completed abnormally, reception error read request (RXn3) turns ON.
The reception data is stored in the R2 reception area at this time.
The data in the R2 reception area is read out when these signals turn ON, and read
complete (RYn2) turns OFF when the reading is completed.
Reception normal read request
or Reception error read request
Reception read complete (RYn2)
The initialization request (RYn4) is turned ON to initialize R2.
When the R2 is correctly initialized, initialization correct complete (RXn4) turns ON,
and when the process ends abnormally, initialization error complete (RXn5) turns ON.
The initialization request signal (RYn4) turns OFF when these signals turn ON.
Initialization request (RYn4)
Initialization normal complete
or Initialization error complete
Details
R2 transmits contents
of transmission area to
(RXn0)
external device.
(RXn1)
(RXn2)
Reception area is read
(RXn3)
with sequence program.
R2 is initialized.
(RXn4)
(RXn5)
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MELSEC-A