Rockwell Automation 1756-XXXX ControlLogix Digital I/O Modules - Manual (Page 58)

58 Rockwell Automation Publication 1756-UM058G-EN-P - November 2012
Chapter 3 Common Module Features
DC 1756-OB8
(6)
None—Fused IFM can be used to protect outputs
(9)
5x20mm
4A Quick acting SOC p/n
MQ2-4A
1756-OB81
(6)
1756-OB8EI
(2) (3) (6)
Yes—Fused on a per point basis Electronically fused
1756-OB16D
(2) (3) (7)
1756-OB16E
(2) (3) (6)
Yes—Fused on a per group basis
1756-OB16I
(6) (8)
None—Fused IFM can be used to protect outputs
(9)
5x20mm
4A Quick acting SOC p/n
MQ2-4A
1756-OB16IEF
(2) (3) (6)
Yes—Fused on a per point basis Electronically fused
1756-OB16IEFS
(2) (3) (6)
1756-OB16IS
(6) (8)
None—Fused IFM can be used to protect outputs
(9)
5x20mm
4A Quick acting SOC p/n
MQ2-4A
1756-OB32
(6) (8)
5x20mm
800mA Littelfuse p/n
SP001.1003 or
Schurter p/n
216.800
1756-OC8
(6)
5x20mm
4A Quick acting SOC p/n
MQ2-4A
1756-OG16
(6)
1756-OH8I
(6) (8)
1756-OV16E
(2) (3) (6)
Yes—Fused on a per group basis Electronically fused
1756-OV32E
(2) (3) (6)
Relay 1756-OW16I
(8)
None—Fused IFM can be used to protect outputs
(9)
5x20mm
6.3A Medium lag SOC p/n
MT 4-6.3A
1756-OX8I
(8)
(1) For voltages above 132V AC, the Interface Modules (IFM) are not an acceptable means to provide external fusing. A rated terminal block for the intended application must be used.
(2) Electronic protection is not intended to replace fuses, circuit breakers, or other code-required wiring protection devices.
(3) The electronic protection of this module has been designed to provide protection for the module from short-circuit conditions. The protection is based on a thermal cut-out principle. In the event of a
short-circuit condition on an output channel, that channel will limit the current within milliseconds after its thermal cut-out temperature has been reached. All other channels with a NUT of that group
will continue to operate as directed by the module master (CPU, bridge, and so forth).
(4) A fuse is provided on each common of this module for a total of two fuses. The fuses are designed to protect the module from short circuit conditions. The fuse does not provide overload protection. In the
event of an overload on an output channel, it is likely that the fuse will not blow and the output device associated with that channel will be damaged. To provide overload protection for your application,
user supplied fuses should be externally installed.
(5) If a short circuit condition occurs on any channel within this module’s group, the entire group is turned Off.
(6) The module does not provide protection against reverse polarity wiring or wiring to AC power sources.
(7) The electronic protection of this module has been designed to provide protection for the module from short-circuit conditions. The protection is based on a thermal cut-out principle. In the event of a
short-circuit condition on an output channel, that channel will limit the current within milliseconds after its thermal cut-out temperature has been reached. Other channels could produce a false error on
the output verify fault signal due to the supply dropping below the minimum detect level of 19.2V DC. The output channels that are affected by this phenomena will continue to operate as directed by the
module master (CPU, bridge, and so forth). What this means is that the output verify fault signals of the other channels should be checked and reset if a short-circuit on one channel occurs.
(8) The recommended fuse for this module has been sized to provide short circuit protection for wiring only to external loads. In the event of a short circuit on an output channel, it is likely that the transistor
or relay associated with that channel will be damaged and the module should be replaced or a spare output channel used for the load. The fuse does not provide overload protection. In the event of an
overload on an output channel, it is likely that the fuse will not blow and the transistor or relay associated with that channel will be damaged. To provide overload protection for your application, user
supplied fuse should be installed externally and properly sized to match the individual load characteristics.
(9) The ControlLogix system has been agency certified using only the ControlLogix RTBs (1756-TBCH, 1756-TBNH, 1756-TBSH and 1756-TBS6H). Any application that requires agency certification of the
ControlLogix system using other wiring termination methods may require application specific approval by the certifying agency.
Table 3 - Recommended Fuses (continued)
Circuit Type Cat. No. Fusing on the module Recommended Fuse Fuse Supplier