SMA Solar Technology AG / SMA Solar Technology America LLC
4 I/O Box
Installation Manual
IMVIOBOX-IA-xx-11
9
4.3.2 Connecting the
Inverter Manager
Pin assignment of the RS485 terminal (see Section 3.3.4,
page 5):
4.3.3 Connecting the Signal Source
Connection of a Signal Source with
Potential-Free Relay Contact
Connection of a Signal Source (10 V to 30 V)
with Digital Output Signals
4.3.4 Connecting the I/O Box to the
Voltage Supply
Connect the 12 Vdc to 36 Vdc connection line with the
terminal for the voltage supply. Connect the grounding of
the connection line to the "V" terminal and connect the
grounding pin if grounding is present.
Do not connect during operation
Do not connect the I/O Box to the Inverter Manager
during operation. Errors might occur that cannot be
detected immediately.
• Disconnect the Inverter Manager from voltage
sources.
• Connect the I/O Box with the Inverter Manager.
• Reconnect the Inverter Manager to the voltage
supply.
Pin
Assignment
D2-
---
D2+
---
GND
GND
D1-
DataA(-)
D1+
DataB(+)
(5) GND
(3) Data B (+)D1+
(4) Data A (
−
)/D1
−
COM0
DI0
DI1
DI2
DI3
DI4
DI5
DI6
DI7
COM1
DIO0
DIO1
DIO2
DIO3
GND
DIO4
DIO5
DIO6
DIO7
GND
COM0
DI0
DI1
DI2
DI3
DI4
DI5
GND
Dry Contact:
closed: DI0 = on
open: DI0 = off
Pin
Assignment
V-
Voltage supply
V+
+24 Vdc nominal (+12 Vdc to 36 Vdc)
Diameter of the varistor leads
For safety reasons the varistor leads for the electricity
supply must have a diameter of at least 2 mm².
COM0
DI0
DI1
DI2
DI3
DI4
DI5
DI6
DI7
COM1
DIO0
DIO1
DIO2
DIO3
GND
DIO4
DIO5
DIO6
DIO7
GND
COM0
DI0
DI1
DI2
DI3
DI4
DI5
GND
Wet Contact:
0 V to 3 V = off
10 V to 30 V = on
U
U
10 V to 30 V
V
−
V+