PXI-2571 Overview

PXI-2571 Pinout


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Table 1. Signal Descriptions
Signal Description
COMx Routing destination for corresponding signal connections
NCx Normally closed signal connection
NOx Normally open signal connection
— No connection

PXI-2571 Hardware Diagram

This figure shows the hardware diagram of the module.


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PXI-2571 Topology

Module software name: 2571/66-SPDT (NISWITCH_TOPOLOGY_2571_66_SPDT)

The module is composed of 66 armature-latching SPDT relays.

For certain applications, you may need to increase the default settling time.

Note Switching inductive loads (for example, motors and solenoids) can produce high voltage transients in excess of the module's rated voltage. Without additional protection, these transients can interfere with module operation and impact relay life.

66-SPDT Topology


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Making a Connection

You can control the channels using the niSwitch Connect Channels VI or the niSwitch_Connect function.

To connect the NO terminal to the COM terminal of that channel, disconnect the NC terminal from the COM terminal of that channel.

For example, to connect NO2 to COM2, use the following code:

niSwitch_Disconnect(vi, "NC2", "COM2")
niSwitch_Connect(vi, "NO2", "COM2")
Note To connect NO to COM, you do not need to disconnect NC from COM after the module has been reset or after you make a call to the niSwitch Disconnect All Channels VI or the niSwitch_DisconnectAll function.
Note niSwitch_Disconnect(vi, "NC2", "COM2") does not activate the relay until niSwitch_Connect(vi, "NO2", "COM2") is executed.

When scanning the module, a typical scan list entry could be nc2->com2;. This entry routes the signal connected to NC2 to COM2.

PXI-2571 Relay Replacement

The module uses electromechanical armature relays.

Refer to the following table for information about ordering replacement relays.

Replacement Relay Part Number
AXICOM (Tyco Electronics) (relay manufacturer) IM42PNS (7-1462039-8)
NI relay kit (10 relays) 781678-01

Ensure you have the following:

  • Temperature-regulated soldering iron set to 371 °C (700 °F) for lead-free solder rework
  • 96.5/3.0/0.5 Tin/Silver/Copper solder (flux core) for lead-free solder rework
  • Solder wick
  • Fine pick
  • Isopropyl alcohol
  • Cotton swabs
Note NI recommends using lead-free solder for relay replacement on lead-free assemblies, and lead solder for relay replacement on lead assemblies.
Notice Do not rework lead assemblies using a lead-free work station. Lead solder from the unit could contaminate the station.
Notice If a lead-free assembly is reworked with lead solder, label the assembly to indicate this. This can prevent the same unit from being reworked later on a lead-free solder station, which could contaminate the station.

Complete the following sets of steps to disassemble your module and replace a failed relay.

  1. Ground yourself using a grounding strap or a ground connected to your PXI chassis.
    Note Properly grounding yourself prevents damage to your module from electrostatic discharge.
  2. Locate the relay you want to replace. Relay names are labeled on the back of module. Refer to the following table for the relay names and channel names.
    Channel NameRelay NameChannel NameRelay NameChannel NameRelay NameChannel NameRelay Name
    CH0 K0CH20K20CH40K40CH60K60
    CH1K1CH21K21CH41K41CH61K61
    CH2K2CH22K22CH42K42CH62K62
    CH3K3CH23K23CH43K43CH63K63
    CH4K4CH24K24CH44K44CH64K64
    CH5K5CH25K25CH45K45CH65K65
    CH6K6CH26K26CH46K46——
    CH7K7CH27K27CH47K47——
    CH8K8CH28K28CH48K48——
    CH9K9CH29K29CH49K49——
    CH10K10CH30K30CH50 K50——
    CH11K11CH31K31CH51K51——
    CH12K12CH32K32CH52K52——
    CH13K13CH33K33CH53K53——
    CH14K14CH34K34CH54K54——
    CH15K15CH35K35CH55K55——
    CH16K16CH36K36CH56K56——
    CH17K17CH37K37CH57K57——
    CH18K18CH38K38CH58K58——
    CH19K19CH39K39CH59K59——
  3. Replace the relay as you would any other through-hole part.
Tip Use the NI-SWITCH Switch Soft Front Panel to reset the relay count after you have replaced a failed relay. Refer to the Switch Soft Front Panel Help for more information.