T H E M O D E R M - B U S T E C H N O L O Y
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3.2.1
Connection Digital inputs
The connection of the digital inputs is shown in the figure below
Figure 3-4
If the gateways is fed with 24VDC this voltage can also be used to feed the digital inputs.
3.3
RS485, plint 8-10
The connection is a common two wire RS485 connection. It is ESD-protected up to 15kV and is
completely galvanic isolated from the earth feed.
Figure 3-5
On plint 10 there is an earth connection that can be used as a reference point if the units
connected have that requirement. This earth connection is completely galvanic isolated from the
earth feed.
Figure 3-6
See also the description about Failsafe for RS485 in chapter 9.1.4.1.
3.4
RS232, plint 11-13
The connection is a common RS232 connection. It is ESD-protected up to 2.5kV and is
completely galvanic isolated from the earth feed.
Figure 3-7