Leuze electronic GmbH + Co. KG
MA 238
i
21
7.2
Electrical connection
The MA 238
i
features two M12 connectors/sockets for voltage supply; each is A-coded.
The voltage supply (PWR IN) as well as the switching inputs/outputs (PWR OUT or PWR IN) are
connected there. The number and function of the switching inputs/outputs depends on the connected end
device. Two additional M12 sockets are used for connection to the fieldbus. Both of these connections are
D-coded.
An internal RS 232 interface is used for connecting the respective Leuze device. Another internal RS 232
interface functions as a service interface for configuring the connected device via a serial null modem
cable.
Figure 7.2: MA 238
i
connections
Described in detail in the following are the individual connections and pin assignments.
7.2.1 PWR IN – voltage supply / switching input/output
ATTENTION!
Voltage supply and bus cable are coded in the same way. Please observe the printed connection
designations.
PWR OUT
VOUT 1
2
3
4
SWIO_2
SWIO_1
GND
FE
5
PWR IN
SWIO_1
SWIO_2
3
2
1
4
5
GND
VIN
FE
HOST / BUS IN
TD+ 1
2
3
4
RD+
RD-
TD-
LEUZE Device
BUS OUT
TD+ 1
2
3
4
RD+
RD-
TD-
M12 connector
(A-coded)
M12 socket
(A-coded)
M12 socket
(D-coded)
M12 socket
(D-coded)
PWR IN (5-pin connector, A-coded)
Pin
Name
Comment
1
VIN
Positive supply v18 … +30VDC
2
SWIO_2
Switching input / switching output 2
3
GND
Negative supply voltage 0VDC
4
SWIO_1
Switching input / switching output 1
5
FE
Functional earth
Thread
FE
Functional earth (housing)
Table 7.1:
PWR IN pin assignment
NOTE
The designation and function of the SWIO depends on the connected device. Please observe
the following table!
PWR IN
SWIO_1
SWIO_2
3
2
1
4
5
GND
VIN
FE
M12 connector
(A-coded)