PXI-2566 Overview

PXI-2566 Pinout

8-DPDT Topology


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Table 1. Signal Descriptions
Signal Description
COMxW0 Wire 0 routing destination for corresponding signal connections
COMxW1 Wire 1 routing destination for corresponding signal connections
GND Ground connection
NCxW0 Wire 0 for normally closed signal connection
NCxW1 Wire 1 for normally closed signal connection
NOxW0 Wire 0 for normally open signal connection
NOxW1 Wire 1 for normally open signal connection
RSVD Reserved, do not connect
TRIG IN Trigger input connection
TRIG OUT Trigger output connection
Notice Do not connect to RESERVED pins. Keep low-voltage pins isolated from row and column channels when high voltage is present.

16-SPDT Topology


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Table 2. Signal Descriptions
Signal Description
COMx Routing destination for corresponding signal connections
GND Ground connection
NCx Normally closed signal connection
NOx Normally open signal connection
RSVD Reserved, do not connect
TRIG IN Trigger input connection
TRIG OUT Trigger output connection
Notice Do not connect to RESERVED pins. Keep low-voltage pins isolated from row and column channels when high voltage is present.

PXI-2566 Hardware Diagram

This figure shows the hardware diagram of the module.


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Topologies

PXI-2566 8-DPDT Topology

Module software name: 2566/8-DPDT (NISWITCH_TOPOLOGY_2566_8_DPDT)

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.

8-DPDT 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 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 a call to the niSwitch Disconnect All Channels VI or the niSwitch_DisconnectAll function has been made.
Note niSwitch_Disconnect(vi, "nc2", "com2") does not activate the relay until niSwitch_Connect(vi, "no2w0", "com2w0") is executed.

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

For example, to connect NC2 to COM2, use the following code:

niSwitch_Disconnect(vi, "no2", "com2")
niSwitch_Connect(vi, "nc2", "com2")

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

PXI-2566 16-SPDT Topology

Module software name: 2566/16-SPDT (NISWITCH_TOPOLOGY_2566_16_SPDT)

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.

16-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 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 a call to the niSwitch Disconnect All Channels VI or the niSwitch_DisconnectAll function has been made.
Note niSwitch_Disconnect(vi, "nc2", "com2") does not activate the relay until niSwitch_Connect(vi, "no2", "com2") is executed.

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

For example, to connect NC2 to COM2, use the following code:

niSwitch_Disconnect(vi, "no2", "com2")
niSwitch_Connect(vi, "nc2", "com2")

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

PXI-2566 Relay Replacement

The module uses electromechanical armature relays.

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

Replacement Relay Manufacturer Part Number
Aromat (NAiS) TQ2SA-5V

Ensure you have the following:

  • Temperature-regulated soldering iron
    • Set to 371 °C (700 °F) for lead-free solder rework
    • Set to 316 °C (600 °F) for lead solder rework
  • Solder
    • 96.5/3.0/0.5 Tin/Silver/Copper solder (flux core) for lead-free solder rework
    • 63/37 Tin/Lead solder (flux core) for lead 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. Refer to the following figure for relay locations.
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    Note Older versions of this module might have adhesive plastic lead covers that you must remove. The module retains full specifications even if the covers are not reinstalled.
  3. Locate the assembly and serial number labels on the board with the relay you want to replace.
    • Green labels indicate the board was assembled using lead-free solder (Sn 96.5Ag 3.0Cu 0.5). Lead-free assemblies have assembly numbers ending in L.
    • White labels indicate the board was assembled using lead solder (Sn 63Pb 37).
    The different label types are shown in the following figure.
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If you have a surface mount rework station, replace the relay as you would any other surface mount part. Otherwise, complete the following steps to replace the relay:

  1. Use the soldering iron and solder wick to remove as much solder from the relay pads as possible. Do not leave the soldering iron on any lead for more than 5 seconds.
    Note If it is necessary to reapply the soldering iron to the pad, allow the connection to cool completely before reapplying the soldering iron.
  2. Apply heat to the pads one at a time, and use the pick to gently pry the relay pins from the pads. Make sure that the solder is molten before prying.
    Notice Using excessive force on a soldered pad can result in lifting the PCB trace and ruining the board.
  3. Remove the relay.
  4. Clean the pads with isopropyl alcohol and cotton swabs.
  5. Place the new relay on the PCB pads and solder.
  6. Remove the excess flux with isopropyl alcohol and cotton swabs.
    Notice Do not use flux remover to clean the board after relay replacement.
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.