3. SPECIFICATIONS
MELSEC-A
3-11
3.8.2
I/O signal functions
The function of each I/O signal for the AJ65BT-68TD is explained below.
(1) Input
signal
Device No.
Signal name
Description
RXn0 to RXn7
CH.
conversion
completion flag
The conversion completion flag turns on when the detected temperature value
converted at each channel is stored in the remote register after power on or a
hardware reset.
If the travel average processing is running, it will turn on when the detected
temperature value is converted and stored in the remote register after the travel
average processing has completed. The conversion completion flag changes
according to the conditions listed below.
•
When conversion disabled is changed to enabled
The temperature detection of the enabled channels will be commenced.
After the detected temperature values are stored in the remote register, the
conversion completion flag is turned on for the corresponding channel.
•
When conversion enabled is changed to disabled
The conversion completion flag is turned off for the corresponding channel.
For the values stored in the remote register, the data immediately prior to the
disable setting are retained.
RXn8 to RXnF
CH.
wire
breakage
detection flag
For the thermocouple input circuit for all channels, when only a single section of the
I/O signal lines including the thermocouple is broken, the wire breakage detection flag
is turned on for the corresponding channel.
The detected temperature value when a wire breakage detection flag is turned on will
be maintained at the normal value immediately prior to the wire breakage, and then the
conversion completion flag will be turned off.
After the wire breakage has been removed, the wire breakage detection flag may be
turned off by turning on the error reset request flag.
Also, after the breakage has been fixed, the updating of detected temperatures value
will be resumed regardless of whether or not the wire breakage detection flag is reset,
and after the first update has been completed the conversion completion flag will turn
on once again.
CH.
measurement
range over flag
When a detected temperature value that falls outside of the upper and lower limits set
in the remote register is detected, the measurement range over flag is turned on for
the corresponding channel.
When the detected temperature value returns to inside the range, it is reset (off)
automatically.
RX (n+2) 1 to
RX (n+2) 7
CH.
write
data error flag
When a value exceeding the specification is written in the write-only area of the remote
register (upper and lower limit setting) or when multiple types of thermocouples are
selected in the thermocouple selection flag, the write data error is turned on for the
corresponding channel.
After the cause of the write data error has been removed, the flag may be turned off by
turning on the error reset request flag.
RX (n+2) 8
After power on or a hardware reset, the internal memory (E
2
PROM for offset/gain value
storage) is checked, and it turns on if there is an error.
At such times, the conversion function will stop.
When this flag turns on, the error reset request flag may not be used to reset (off)
because the module itself is malfunctioning (hardware error).
Turns on during test mode.
Turns off when reverted to normal mode.
RX (n+1) 1 to
RX (n+1) F
E
2
PROM
abnormal flag
Test mode flag
RX (n+2) 9
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