MINI and MIX Series I/O modules/Modbus
version 1.3
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3.11.1.10
Cooling mode (4U4O-H and 4U4O-H-IP only)
In this mode output is controlled as a typical thermostat, based on Setpoint register and
Control value (Input signal) 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 <= Setpoint – Differential
Output in high state:
Control value >= Se Differential
The cooling mode algorithm is shown in chart below.
Figure 31 Cooling 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.
Time Value registers (40177,40181,40185,40189)
The registers contain time values for TIME RELAY modes. The time unit depends on
selected mode [milliseconds] or [seconds].