2. Transportation, Storage and Installation
2-48
TI 32P01J10-01EN
Mounting conditions
• Do not mount the IOBP/IOBP_IS so that its heat-generating part (Barrier or I/O) is located
immediately under the N-ESB Bus module (S2EN501). The IOBP/IOBP_IS may be
mounted immediately under the power supply of the NIU (S2PW50x).
• The NIU shall be mounted with a 2-unit or more space from the ceiling of the junction box.
• A 2-unit or more space shall be provided between the NIU and IOBP/IOBP_IS.
• To mount heat-generating devices other than NIU and IOBP/IOBP_IS shall be mounted with
30-mm intervals on the right of the NIU on the top shelf. The specications of the devices
shall be observed.
The following shows how to mount N-IO nodes (mixture of Intrinsic Safety barrier and Non-
Intrinsic Safety barrier) in a junction box:
F020533.ai
Junction Box
NIU
Heat-generating
device mounting area
(max. 20 W)
IOBP_IS
IOBP
Non-mounting area (2 units or more) /
Wiring is possible
Non-mounting area
/ Wiring is possible
(30 mm or more)
Heat-generating device non-mounting
area (under the N-ESB Bus module)
Wiring is possible
Field wiring area
Wiring area
NIU
Power supply unit
Power supply unit
IOBP
2units or more
1unit or more
Non-mounting area
Figure Example of Mounting N-IO Nodes (Mixture of Intrinsic Safety Barrier and Non-Intrinsic Safety
Barrier) in a Junction Box
CAUTION
The wiring that will be intrinsic safety circuits must be installed so that they are electrically
separated from the wiring of non-intrinsic safety circuits, including the in-cabinet wiring. Install the
wiring according to the IEC 60079-14 standards or the requirements for explosion-proof wiring of
the country where the system is used.
Mar. 29, 2019-00
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