Owner's manual

Rockwell Automation Publication 1756-UM058G-EN-P - November 2012 57
Common Module Features Chapter 3
Multiple Output Point Densities
ControlLogix output modules use either 8-, 16-, or 32-point densities for greater
flexibility in your application. A point is the termination where a wire attaches to
the I/O module from a device. The I/O gets information from the device to this
designated point, thus signaling when activity occurs.
Electronic Fusing
Some digital outputs have internal electronic or mechanical fusing to prevent too
much current from flowing through the module. This feature protects the
module from electrical damage. Other modules require external fusing.
Modules that use electronic fusing are fused on either a per point basis or per
group basis to protect output points from the surge of too much current. If too
much current begins to flow through a point, the fuse is tripped and a point-level
fault is sent to the controller. A corresponding tag can be examined in the event of
a fault. For more information about fault tags, see Appendix
B.
These modules use electronic fusing:
• 1756-OA8E
• 1756-OB8EI
• 1756-OA8D
• 1756-OB16D
• 1756-OB16E
• 1756-OV16E
• 1756-OV32E
• 1756-OB16IEF
• 1756-OB16IEFS
Refer to Tab le 3
to determine what fuse to use in your application. If your module
does not support fusing, you can use a fused IFM to protect outputs. See
publication 1492-TD008
.
Table 3 - Recommended Fuses
Circuit Type Cat. No. Fusing on the module Recommended Fuse Fuse Supplier
AC 1756-OA8
(1)
None—Fused IFM can be used to protect outputs
(9)
5x20mm
6.3A Medium lag
SAN-O Industry Corp.
(SOC) p/n
MT 4-6.3A
1756-OA8D
(2) (3)
Yes—Fused on a per point basis Electronically fused
1756-OA8E
(2) (3)
1756-OA16
(1) (4) (5)
Yes—Fused on a per group basis 5x20mm
3.15A Slo-Blow
1500A Interruption current
Littelfuse p/n
H2153.15
1756-OA16I
(1)
None—Fused IFM can be used to protect outputs
(9)
5x20mm
6.3A Medium lag
SOC p/n
MT 4-6.3A
1756-ON8