3.
SPECIFICATIONS
MELSEC-A
1
a
(b) When data is received from a computer:
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d
i
When an AJ71C24 receives data from a computer, the AJ71C24
writes the data length contained
in
the message to its buffer
memory.
..
..
The sequence program reads the data length from the buffer
memory to read all the received data.
The functions available with the bidirectional mode cannot be used
together with the functions available with the no-protocol mode mentioned
in
Section 3.3.2. Select either mode using the mode setting switch (see
Section 4.3.l)hwitching the mode (see section 3.4) and by setting the
bidirectional mode setting area
in
the special applications buffer memory
area (see Sections 3.5 and 10.2).
3.3.4
Transmission
error
data
read
function
This function permits the sequence program to read error data when the
error LEDs on the front panel of the module are
lit
and permits the sequence
program to turn OFF an error LED which is
lit.
Section 7.3 gives details about
sequence programs.
(1)
Reading transmission error data
The display status
sf
the error LEDs
is
stored
in
buffer memory. The
sequence program can read this data to permit the PC CPU to execute
error checking and interlocking
with
data communication sequence
programs.
(2) Function to turn off error LEDs
This function permits the sequence program to turn
off
error LEDs
which are
lit
without resetting the PC CPU.
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7
1
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