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MELSEC-A
3 SPECIFICATIONS
3.6.2 Details of input/output signals
A detailed explanation of the R2 input/output signals is given below.
The lines in the timing chart indicate the following details.
The lines in the timing chart indicate the following details.
(1) Remote input (RX)
Device No.
Signal name
Details
RXn0
Transmission normal
complete
complete
RXn1
Transmission error
complete
complete
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.
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.
R2 transmits contents
of transmission area to
external device.
of transmission area to
external device.
Transmission normal complete
(RXn0)
or Transmission error complete
(RXn1)
(RXn0)
or Transmission error complete
(RXn1)
Transmission request (RYn0)
RXn2
Reception normal
read request
read request
RXn3
Reception error read
request
request
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.
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 area is read
with sequence program.
with sequence program.
Reception read complete (RYn2)
Reception normal read request
(RXn2)
or Reception error read request
(RXn3)
RXn4
Initialization normal
complete
complete
RXn5
Initialization error
complete
complete
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.
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.
R2 is initialized.
Initialization normal complete
(RXn4)
or Initialization error complete
(RXn5)
(RXn4)
or Initialization error complete
(RXn5)
Initialization request (RYn4)