iSMA-B-W0202 User Manual
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DMP263en | 1st Issue rev. 3 | 05/2022
page 31 of 41
Time Relay NC [s]
In this mode, if the output value is false, the falling edge on the special input sets the
output to true. Every rising edge on the special input starts the counter from the
beginning, which means that the output will stay true for a time defined in the Time Value
register (expressed in seconds), counting from the last rising edge of the special input.
The time relay action can be executed remotely by changing the state from false to true in
the relevant Command register (40020). Outputs can be also overwritten by the Digital
Output register (40018), which allows remote control from BMS.
Input Forwarding
In this mode, any signal from the input is transferred directly to the assigned output
without any modifications. The input forwarding mode can be stopped by the Block Input
function (see Blocking register).
Heating Mode
In this mode, the output is controlled as a typical thermostat, based on the Setpoint
register and control value (input value) with differential parameter defined in the
Differential register. The output signal works in 2 states, low and high.
If the control value is lower than or equal to the difference of the Setpoint register and
Differential register, the output is in low state.
If the control value is higher than or equal to the sum of the 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 18. Heating mode algorithm
