Pull-Up And Pull-Down Resistors; Replacing A Fuse; Fuse Specifications - MC PCI-DIO48H User Manual

PCI-DIO48H User's Guide

Pull-up and pull-down resistors

The PCI-DIO48H has open locations where you can install a 2.2 K , eight-resistor single inline package (SIP)
resistor network for each port. The locations are labeled
, , and
PORT 2A PORT 2B
The SIP is made up of eight 2.2 K resistors. One side of each resistor is connected to a single common point and
brought out to a pin. The common line is marked with a dot or line at one end of the SIP. The remaining resistor
ends are brought out to the other eight pins (refer to Figure 4).
The SIP may be installed as pull-up or pull-down. At each RN# location, there are 10 holes in a line. One end of
the line is +5V, the other end is GND. They are marked
are connected to the eight lines of a port.

For a pull-up function, mount the SIP with the common pin (marked with a dot or line) in the

For a pull-down function, mount the SIP with the common pin in the
When installing pull-up and pull-down resistor SIP packs, we recommend using a 2.2 K, eight-resistor SIP
(MCC part number SP-K2.29C).
Unconnected inputs float
Unconnected inputs typically float high, but not reliably. If you are using a PCI-DIO48H for input and have
unconnected inputs, ignore the data from those lines. You do not have to terminate input lines. Unconnected
lines will not affect the performance of connected lines. Mask out any unconnected bits in software.

Replacing a fuse

The PCI-DIO48H has a 1 amp slow blow fuse connected to the +5V User Output at pin 49, and is labeled
the board. A spare fuse is installed on the board at location
convenient replacement.
A fuse will blow during operation if amperage exceeds 1 amp. If you need to replace a fuse, perform the
following procedure.
1. Pry the center of the fuse from the fuse holder clip.
2. Insert the replacement fuse into the fuse holder clip.

Fuse specifications

Refer to the information below to purchase additional fuses, (or an equivalent), if required:

Manufacturer: LittelFuse

Series: 452 Series - NANO

Part number: 0452001. (Include the period as part of the item number.)
 1 amp, 125 volts, 0.225 Ω

www.littelfuse.com/part/0452001.html
(RN13 to RN15).
PORT 2C
2.2 KOhm SIP
Dot
(LO or HI)
Figure 4. Eight-resistor SIP schematic
®
2® ®
Slo-Blo Subminiature Surface Mount Fuse
PORT 1A , PORT 1B ,
I/O Lines
and respectively. The eight holes in the middle
HI LO
LO position.
. Each fuse is secured to the board with clips for
F2
14
Functional Details
PORT 1C (RN10 to RN12), and
position.
HI
F1 on