3. SPECIFICATIONS MELSEC-A
3-23
3.9.2 High and low limit settings
The AJ65BT-68TD can set the measured temperature range (upper and lower limits) for each channel
to the remote register (RWwm to RWwm+15)
The value of the detected temperature value range for the thermocouple set by the thermocouple
selection flag is used by default.
However, since this is a write-only remote register, the set upper and lower limit values cannot be
read.
(1) Upper and lower limit value setting range
Default value
Lower limit Upper limit
K -2000 12000 -2000 to 12000
E -2000 8000 -2000 to 8000
J 0 7500 0 to 7500
T -2000 3500 -2000 to 3500
B 6000 17000 6000 to 17000
R 0 16000 0 to 16000
S 0 16000 0 to 16000
(2) Setting/changing methods for the upper and lower limit values
• When setting the upper and lower limits
After writing desired values to the remote register, perform power on or hardware reset. The
values are set when the initial data processing request flag turns on.
After the changes, turn on the initial data processing completion flag.
• Changing the upper and lower limits
After writing desired values to the remote register, the values are changed by turning on the
initial data setting request flag.
After the changes, the initial data setting completion flag will turn on.
POINT
• If the measured values are not within the upper and lower limit range, the measurement range
over flag is turned on for the corresponding channel.
When the detected temperature value returns to within the upper and lower limit range, the
measurement range over flag is reset (turned off) automatically.
• When a value outside the measured temperature range is written, or the values for upper and
lower limits are switched (upper limit value ≤ lower limit value), a setting error occurs and a
write data error flag is turned on for the corresponding channel. At the same time, the error
status flag is turned on.
Thermocouple type
Possible upper and lower limit
value setting range
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