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130 620 300 Rev.C 171116
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INSTALLATION MANUAL
ProSMS 8
5.4
Digital Input/Output
Two potential-free digital inputs are provided on the ProSMS to facilitate the monitoring of external
ancillary equipment.
Examples may include:
monitoring of installed SPD, cabinet door, interlock
switches, alarm functions etc. These inputs are by default internally pulled to 5V. In order to activate the
digital inputs they must be connected to the DCOM terminal via potential-free contact closures. Contact
closure is read as value 1 (Contact ON). The status of these two auxiliary inputs are read from the
Modbus input register 00052 (see page 15).
The ProSMS also provides an optional output control via the SPDT relay contacts. These contacts can
be used for a variety of purposes, such as the control of a safety disconnect switch, or the signal to a
PLC or other relay/contactor. The output is controlled by writing to the Modbus holding register 00000
(see page 16).
Relay output terminals and connecting wiring should not be accessible to the user when
the device is powered. The relay provides only functional insulation to PV potential
(2000Vrms@1min). Connections and wiring should not extend outside the combiner box
enclosure.
CAUTION
VOLTAGE
DANGER
WARNING
NOTICE
Fig. 5-4: Typical wiring of pote
n�al f
ree inputs and relay output
Fig. 5-4: Typical wiring of potential free inputs and relay output
Summary of Contents for ProSMS 8
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