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3. SPECIFICATIONS
MELSEC-A
(b) When data is received from a computer:
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.
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Transa
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 4.3.1) and by setting the bidirectional mode setting area in the
special applications buffer memory area (see Sections 3.5 and 10.2).
sion 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 of 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.
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(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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