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MELSEC-Q
3 SPECIFICATIONS
(20) Slave Function For Error Information (address 0601
H
/1537)
The communication error code when the slave function is used is stored.
(a) When an error occurs, the error information is stored in the "slave function
for error information" area and the slave function for error set signal (X08) is
turned ON.
(b) The data of the " slave function for error information " area is cleared by
turning ON the slave function for error reset request (Y18) by the sequence
program.
(c) See Section 9.2.1, "Communication error code," for details of the error
information.
(21) Setting area of the number of slave function reception bytes
(address 060E
H
/1550)/setting area of the number of slave function
transmission bytes (address 060F
H
/1551)
The I/O data reception size and the I/O data transmission size of the slave
function parameters are set. This area is used to set parameters by the
sequence program. The contents of the parameters are checked when the I/O
communication request (Y11) is turned ON, and the communication starts if there
is no error. Although the contents of the buffer memory are cleared when the
power is turned OFF and at reset, the contents of the parameters saved in the
flash ROM are stored in the setting area of the number of slave function
reception bytes and in the setting area of the number of slave function
transmission bytes, if the flash ROM contains valid parameters. Turn ON the
save parameter to flash ROM request (Y17) to save in the flash ROM as
necessary.
Table 3.25 lists the contents of parameter settings.
Table 3.25 Parameter setting data for the slave function
Buffer memory
address
(hexadecimal)
Item Description
060E
H
Setting area of the number of slave
function reception bytes
Sets the I/O data reception size of parameter for slave function.
(Setting range: 0 to 128 bytes, default value: 8 bytes)
060F
H
Setting area of the number of slave
function transmission bytes
Sets the I/O data transmission size of parameter for slave function.
(Setting range: 0 to 128 bytes, default value: 8 bytes)
POINT
Because of the limited number of writes of the flash ROM, execute the save
parameter to flash ROM request (Y17) only when creating a new parameter or
changing a parameter.