89
Using the Transfer Output Section 4-13
Transfer Scaling • Reverse scaling is possible by setting the “transfer output lower limit”
parameter larger than the “transfer output upper limit” parameter. If the
“transfer output lower limit” and “transfer output upper limit” parameters
are set to the same value when 4 to 20 mA is set, the transfer output will
be output continuously at 0% (4 mA).
• If the SP, SP during SP ramp, or PV is selected, the “transfer output lower
limit” and “transfer output upper limit” parameters will be forcibly initialized
to the respective upper and lower setting limits for changes in the upper
and lower limits of the SP limiter and the temperature unit.
If the MV for heating or MV for cooling is selected, the “transfer output
lower limit” and “transfer output upper limit” parameters will be initialized
to 100.0 and 0.0, respectively, when a switch is made between standard
control and heating/cooling control using the “standard or heating/cooling”
parameter.
• The output current when the linear current type is set to 4 to 20 mA, the
transfer output upper limit is set to 90.0, and the transfer output lower limit
is set to 10.0 is shown in the following graph.
• For scaling from 0.0% to 100.0%, the output for −5.0 to 0.0 will be the
same value as for 0.0%, and the output for 100.0 to 105.0 will be the
same value as for 100.0%
20.3
20
4
3.7
0
100
Output current (mA)
Transfer output value
Control output
MV (%)
(The above graph is for when the linear current output type is set to 4 to 20 mA.)
100
90
100
20
4
Output current (mA)
MV (%)
Transfer output
lower limit
Transfer output
upper limit
(The above graph is for when the linear current output type is set to 4 to 20 mA.)
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