iSMA-B-FCU Hardware User Manual
www.ismacontrolli.com
DMP242en | 1st Issue rev. 3 | 02/2022
page 19 of 53
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5 Inputs and Outputs
5.1 Inputs
The iSMA-B-FCU device is equipped with two types of inputs: 4 digital inputs (for Boolean
values) and 4 special inputs (for resistance and voltage measurement).
5.1.1 Special Inputs
The iSMA-B-FCU device has 4 built-in special inputs, which can work in the following
modes:
digital (dry contact);
analog (0-10 V DC);
resistance
(0-1000 kΩ (1 MΩ));
temperature ( working with NTC sensors).
Special Input in Digital Mode
In this mode, the special input works as a digital input dry contact and reactive Boolean
value, false for open circuit and true for close circuit. The circuit status is measured with 1
mA current.
Figure 13. Speical inputs in digital mode connection
Special Input in Analog Mode
In this mode, the special input measures voltage in the range from 0 to 10 V DC (10 000
mV) with 6 mV resolution.
