iSMA-B-W0202 Modbus User Manual
version 1.2
Page 30 / 49
8.1.9
Heating mode
In this mode output is controlled as a typical thermostat, based on Setpoint register and Control
value (Input value) with differential parameter defined in Differential register. The output signal
works in 2 states low and high.
When Control value is lower or equal the difference of Setpoint register and differential register
the output is in low state.
When Control value is higher or equal the sum of Setpoint register and differential register the
output is in high state.
Output in low state:
Control value >= Se Differential
Output in high state:
Control value <= Setpoint – Differential
The heating mode algorithm is shown in chart below.
Figure 17 Heating mode algorithm functioning
WARNING!
In the case when temperature sensor is failed (disconnected or shortcut) then
heating mode does not work and output stays in the false state.