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5.4
Input and output circuit
TM15
Figure 5-2
Grounding scheme
For TM15, the following are internally connected:
● Module power supply ground
● Logic ground
● TM chassis
The ground for the I/O power supply (terminals M1, M2, and M3) is capacitively coupled to
the three grounds indicated above.
If terminal M1, M2 or M3 is connected to one of the three grounds indicated above, isolation
for the associated group of I/O channels will be lost.
The I/O power supply ground (terminals M1, M2, and M3) must be connected to the
reference ground of the current source in order for their associated I/O channels to function.
TM15 / TM17 High Feature Operating Manual
Commissioning Manual, 05/2009
Input and output circuit - TM15
Application tips
5.4 Input and output circuit
59
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