FNM alpha SM 230, User Manual, Page: 15 / 72

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Description of device-specific features
Sensor module
Different sensors can be connected to the sensor module SM 230. Two 16-pole terminal
strips are available for this.
Sensor cables with a cross section of 0.08 - 0.5 mm
2
(AWG 28-20) can be connected.
The cable terminations should be stripped 5 - 6 mm. At the housing versions, the sen-
sor cables have to be led through the cable gland and have to be connected to the
appropriate interface.
The different connection possibilities are summarised in groups in the following table.
Bus
optional Standard sensor Inputs Outputs
I
2
C PT1000 2 wire 2 x analogue
0 - 2.5 V 2 x analogue
0 - 2.5 V
SPI PT1000 3 wire 1x analgoue
0 - 10 V 2 x digital
UART PT1000 4 wire 2 x digital
In case of need, all connections can be used simultaneously. Furthermore, the voltage
supply is possible over these terminal strips.
The sensor modules are optionally equipped with a switch off function that can be
controlled over the sensor interface.
The sensor module SM 230-G is available in an IP65 housing, the sensor module
SM 230 is available as PCB version.
The user can determine the measuring interval of every single sensor module in the
range of 10 s…1 year. The respective sensor module always sends latest measured
values after expiration of this time (also see chapter "Control software and software
interface").
Capacities (Min / Max) can also be determined for the analogue inputs as well as for the
PT1000 interface. The sensor module then only transmits valid measured values in case
these are within this range. In case a value out of this range is measured, an invalid
measured value (0x0000) will be sent (see chapter "Control software and software
interface").
The analogue outputs (channel 1 and 2) as well as the UART interface are deactivated
in case of battery operation in order to achieve a lifetime of the battery as long as
possible.