50 • Transformers 026-1701 Rev 0 01-05-98
3. On a 24 V AC line with the ground in the sys-
tem on either side of the power line or with no
ground in the system at all (Figure 41)
When the 8IO board is used by itself, it is satisfactory
to wire the board with no grounding on either side of the 24
V AC power supply. Connect an Earth Ground to 0 V ter-
minal of the 8IO’s power connection.
When the 8IO board is wired in conjunction with other
boards, the 8IO board is not grounded through the other
board’s center tap. A separate Earth ground should be run
from the 0 V terminal of the 8IO’s power connection.
Figure 39-Single 8IO Board Wired to One Transformer
Figure 40-8IO Board Wired in Combination with A or Multiple
16AI, 8RO, 4AO, 8DO
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