Rate Control Function - Mitsubishi Electric MELSEC Q Series User Manual

3 SPECIFICATIONS

3.2.5 Rate control function

Digital input value
Analog output value
Programmable
controller CPU status
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(1) The increase and decrease in analog output values per conversion cycle (10ms)
can be limited to prevent rapid changes of the values.
(2) For the rate control function, whether to enable or disable the rate control can be
set for each channel by using Rate control enable/disable setting (buffer memory
address 46: Un\G46).
To enable the rate control, write "0" to the bit position corresponding to the
channel number and turn on and off Operating condition setting request (Y9). For
default, the rate control is disabled for all channels.
(3) Set CH Increase/Decrease digital limit value (buffer memory address 70 to
73: Un\G70 to Un\G73).
Example) The control example in the following case is indicated below.
Output range: -10 to 10V
Increase digital limit value: 100
Decrease digital limit value: 100
500
400
300
200
100
0
0 10 20 30
(4) If the operation of the programmable controller CPU varies at the setting of D/A
conversion enable, D/A output enable and analog output clear, the rate control
function is as indicated below.
• If the programmable controller CPU has switched from RUN to STOP (error):
Rate control does not function.
• If the programmable controller CPU has switched from STOP (error) to RUN:
Rate control functions.
Analog value converted
from digital input value
RUN
40 50 60 70 80
Time (ms)
Offset value
STOP (error)
MELSEC-Q
Digital input value
Analog output value
90 100 110 120
Analog value converted
Rate control valid
from digital input value
RUN
Voltage of analog
output value (mV)
312.5
250.0
187.5
125.0
62.5
0.0
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