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FX2N-2LC Temperature Control Block
7.2.13
BFM #19 (CH1) and BFM #28 (CH2): Manual output set value
In BFM #19 (CH1) and BFM #28 (CH2), set the output ON ratio in the manual mode.
The display range is from -5.0 to +105.0%.
The output ON/OFF cycle (period of time) can be set within the range from 1 to 100 sec using
BFM #42 (CH1) and BFM #61 (CH2).
Write the percentage of the ON period of time.
7.2.14
BFM #20 (CH1) and BFM #29 (CH2): Auto tuning execution command
In BFM #20, perform auto tuning of CH1. In BFM #29, perform auto tuning of CH2.
When BFM #20/#29 is set to "K0", auto tuning is stopped.
When BFM #20/#29 is set to "K1", auto tuning is performed.
7.2.15
BCM#30: Unit type code
BFM #30 stores the unit type code "2060 (fixed value)" of the FX
7.2.16
BFM #32 (CH1) and BFM #51 (CH2): Operation mode
In BFM #32, select the operation mode of CH1. In BFM #51, select the operation mode of
CH2.
When BFM #32/#51 is set to "K0", only monitor is performed. (At this time, the control output
remains OFF.)
When BFM #32/#51 is set to "K1", monitor and temperature alarm are performed. (At this
time, the control output remains OFF.)
When BFM #32/#51 is set to "K2 (initial value)", all of monitor, temperature alarm and control
are performed.
- Monitor: Monitors the measured value (BFM #3/#4).
Temperature alarm: Monitors the event input error (b0 and b1 of BFM #1 and BFM #2)
and alarms 1 to 4 (b4 to b7 of BFM #1 and BFM #2).
Control: Performs temperature control (PID control) and gives the control output.
- The setting of "K0" to "K2" above is effective only when control starts (BFM #11).
While control is stopped, only monitor is performed without regard to the setting
described above.
7.2.17
BFM #33 (CH1) and BFM #52 (CH2): Proportional band (P)
In BFM #33, set the proportional band of CH1. In BFM #52, set the proportional band of CH2.
The proportional band is required to give the control output in proportion to the deviation
(which is the difference between the set value (SV) and the measured value (PV)).
As the proportional band value is larger, changes in the control output value (MV) in response
to changes in the input is smaller. On the contrary, as the proportional band value is smaller,
changes in the control output value (MV) in response to changes in the input is larger. (Gener-
ally, the proportional band is the inverse number of the proportional gain.)
However, if the proportional band value is too large, overshoot becomes large and it takes con-
siderable time until the output is stabilized at the set value.
The allowable set range is from 0.0 to 1,000.0%.
When BFM #33/#52 is set to "0.0", two-position control is performed.
Buffer Memory (BFM) 7
-2LC.
2N
7-9
7
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