Rockwell Automation Publication 1718-UM001A-EN-E - December 2019
9
Product Specifications
Chapter 1
Table 2 - 1718 Ex I/O Components Overview
Field Units
Field units (surrounding enclosures) serve to protect all electronic components
against environmental influences and are an integral part of explosion
protection. The enclosures are made of glass fiber reinforced polyester or
stainless steel and are available in various versions. The surrounding enclosures
contain backplanes for the connection of modules. The modular concept
allows multiple surrounding enclosures to be flanged together to create the
required expansion level. Each surrounding enclosure contains Ex-e terminals
for power and communication lines. For safety, these are individually equipped
with protective covers (IP30) and touch protection.
The surrounding enclosures are equipped with a rating plate listing all safety-
relevant information, e.g., type of ignition protection, temperature class,
permissible ambient temperature and permissible power.
Plastic enclosure
Glass fiber reinforced polyester offers a high level of mechanical protection for
both onshore and offshore plants.
Figure 2 - Field unit with plastic enclosure partially without cover and modules
Description
Description
1
Field Unit (Surrounding Enclosure)
6
Backplane
2
Power supply
7
Cable gland for field lines
3
Bus termination module
8
Cable gland for power supply and bus cables
4
Adapter
9
Ex-e-terminals and IP30 cover
5
I/O module