The following section is relevant to Unitronics’ products that are listed with the UL.
The following models: IO-AI4-AO2, IO-AO6X, IO-ATC8, IO-DI16, IO-DI16-L, IO-DI8-RO4,
IO-DI8-RO4-L, IO-DI8-TO8, IO-DI8-TO8-L, IO-RO16, IO-RO16-L, IO-RO8, IO-RO8L, IO-TO16,
EX-A2X are UL listed for Hazardous Locations.
The following models: EX-D16A3-RO8, EX-D16A3-RO8L, EX-D16A3-TO16, EX-D16A3-TO16L,
IO-AI1X-AO3X, IO-AI4-AO2, IO-AI4-AO2-B, IO-AI8, IO-AI8Y, IO-AO6X, IO-ATC8, IO-D16A3-RO16,
IO-D16A3-RO16L, IO-D16A3-TO16, IO-D16A3-TO16L, IO-DI16, IO-DI16-L, IO-DI8-RO4,
IO-DI8-RO4-L, IO-DI8-RO8, IO-DI8-RO8-L, IO-DI8-TO8, IO-DI8-TO8-L, IO-DI8ACH, IO-LC1, IO-LC3,
IO-PT4, IO-PT400, IO-PT4K, IO-RO16, IO-RO16-L, IO-RO8, IO-RO8L, IO-TO16, EX-A2X, EX-RC1 are UL listed for
Ordinary Location.
UL Ratings, Programmable Controllers for Use in Hazardous Locations,
Class I, Division 2, Groups A, B, C and D
These Release Notes relate to all Unitronics products that bear the UL symbols used to mark products that have been
approved for use in hazardous locations, Class I, Division 2, Groups A, B, C and D.
◼ WARNING—Explosion Hazard—substitution of components may impair suitability for Class I, Division 2.
◼ WARNING – EXPLOSION HAZARD – Do not connect or disconnect equipment unless power has been
switched off or the area is known to be non-hazardous.
◼ WARNING – Exposure to some chemicals may degrade the sealing properties of material used in Relays.
◼ This equipment must be installed using wiring methods as required for Class I, Division 2 as per the NEC
and/or CEC.
Relay Output Resistance Ratings
The products listed below contain relay outputs:
Input/Output expansion modules, Models: IO-DI8-RO4, IO-DI8-RO4-L, IO-RO8, IO-RO8L
◼ When these specific products are used in hazardous locations, they are rated at 3A res, when these specific products
are used in non-hazardous environmental conditions, they are rated at 5A res, as given in the product’s specifications.
Certification UL des automates programmables, pour une utilisation en
environnement à risques, Class I, Division 2, Groups A, B, C et D.
Cette note fait référence à tous les produits Unitronics portant le symbole UL - produits qui ont été certifiés pour une
utilisation dans des endroits dangereux, Classe I, Division 2, Groupes A, B, C et D.