Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 446

Processing details
■Split conversion
The function block is used to control two (heating and cooling) operation terminals with a loop tag FB as shown in the
following figure.
PV TIC
001
Loop tag
Heating and
cooling output FB
Thermometer
Tank
• Split conversion
This function block performs split conversion for the setting value (SV) and calculates each tentative manipulated value for
heating and cooling (T_HT, T_CL).
Dead band (DBND)  0
Tentative manipulated variable for heating (cooling) (T_HT, T_CL) (%)
100%
Tentative manipulated
variable for cooling
(T_CL)
0%
0%
Dead band (DBND) < 0
Tentative manipulated variable for heating (cooling) (T_HT, T_CL) (%)
100%
Tentative manipulated
variable for cooling
(T_CL)
0%
0%
Split median (SPLT)
A value at which output is switched between heating output and cooling output in split conversion.
Dead band (DBND)
When the setting value (SV) is within a half range from the split median (SPLT) to the value set in the dead band (DBND), the
tentative manipulated value for heating or cooling (T_HT, T_CL) will be the low limit value.
When a negative value is set in the dead band (DBND) and the setting value (SV) exceeds a half range from the split median
(SPLT) to the value set in the dead band (DBND), the tentative manipulated value for heating or cooling (T_HT, T_CL) will be
the low limit value.
12 LOOP TAG
444
12.40 Heating and Cooling Output (M+M_HTCL_T_)
MV
Steam
Cooling water
Tentative manipulated
variable for heating
(T_HT)
DBND
SPLT
100%
Tentative manipulated
variable for heating
(T_HT)
DBND
SPLT
100%
SV(%)
SV(%)