Honeywell TotalPlant LCN System Installation page 38

STEP 2
Five-Slot Modules
5
DHI I/O
4
3
2
1
Figure 4-2 — Logic Ground (LG) Connection to Safety Ground Stake
Dual Node Modules
DHI I/O
Figure 4-3 — DHI I/O Ground Connection in a Dual Node Module
LCN System Installation
Hiway Gateway modules that connect to Data Hiways that
do not have HTDs must have a ground wire installed from
the DHI I/O board to the MRG.
Five-Slot
Module
LG
CG
HG
If an HG is used without an HTD, the DHI I/O board
ground screw must be connected to the HG connection
post (shown in the figures of this section) and the HG
connection post must be wired with 4-gauge wire to the
Master Reference Ground (MRG), as shown in the Data
Hiway Subsystem Site Planning manual.
If the HG, used without an HTD, is located in a cabinet,
the LG/HG service post must be grounded to an MRG Star
2
Plate with a 5.3 m
Daisy chaining of MRG and HG grounds is not allowed.
MRG Star Plate
or MRG Stake
LG HG
4-2
Wire the screw on the DHI I/O
board to the HG ground terminal
in the cabinet.
(#4 AWG) wire.
Dual Node
with HG
CG
LG
54067
4.2
54065
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