PXIe-2738 Overview

PXIe-2738 Pinout



Table 1. Signal Descriptions
Signal Description
Cx+ Positive column connection
Cx- Negative column connection
Rx+ Positive row connection
Rx- Negative row connection

PXIe-2738 Topology

Module software name: 2738/2-Wire 8x32 Matrix (NISWITCH_TOPOLOGY_2738_2_WIRE_8X32_MATRIX)

This configuration supports the immediate operation mode.

1-Wire 8×32 Matrix



Relay Names

Relays
kR0C0...kR0C31
kR1C0...kR1C31
kR2C0...kR2C31
kR3C0...kR3C31
kR4C0...kR4C31
kR5C0...kR5C31
kR6C0...kR6C31
kR7C0...kR7C31

Making a Connection

You can connect any row to any column. In software, R0 refers to the R0+ and R0– pair. All other channels follow a similar naming scheme.

You can connect module channels using the niSwitch Connect Channels VI or the niSwitch_Connect function. For example, to connect row 1 to column 1, call the niSwitch Connect Channels VI or the niSwitch_Connect function with the channel 1 parameter set to r1 and the channel 2 parameter set to c1, or vice versa.

Replacing a Failed Relay for PXIe-2738

The PXIe-2738 uses electromechanical armature relays.

Replacement Relay Part
Tyco Electronics 5-1462039-8
National Instruments (10 relays) 781089-10

Complete the following steps to disassemble the PXIe-2738 module, replace a failed relay, and reassemble the PXIe-2738.

Locate the Relay

  1. Ground yourself using a grounding strap or a ground connected to your PXI Express chassis.
    Note Properly grounding yourself prevents damage to your module from electrostatic discharge.
  2. Locate the relay you want to replace.
    1. Match the channel name to its corresponding relay name.
    2. Match the relay name with its reference designator using the tables below.
      Note Reference designators are printed on the PCB.

PCB 1 - Motherboard



PCB 2 - Daughterboard



PCB 1 Relay Locations

Relay Name Reference Designator Relay Name Reference Designator Relay Name Reference Designator Relay Name Reference Designator
kr0c0 K1 kr2c0 K5 kr0c16 K65 kr2c16 K69
kr0c1 K2 kr2c1 K6 kr0c17 K66 kr2c17 K70
kr0c2 K9 kr2c2 K13 kr0c18 K73 kr2c18 K77
kr0c3 K10 kr2c3 K14 kr0c19 K74 kr2c19 K78
kr0c4 K17 kr2c4 K21 kr0c20 K81 kr2c20 K85
kr0c5 K18 kr2c5 K22 kr0c21 K82 kr2c21 K86
kr0c6 K25 kr2c6 K29 kr0c22 K89 kr2c22 K93
kr0c7 K26 kr2c7 K30 kr0c23 K90 kr2c23 K94
kr0c8 K33 kr2c8 K37 kr0c24 K97 kr2c24 K101
kr0c9 K34 kr2c9 K38 kr0c25 K98 kr2c25 K102
kr0c10 K41 kr2c10 K45 kr0c26 K105 kr2c26 K109
kr0c11 K42 kr2c11 K46 kr0c27 K106 kr2c27 K110
kr0c12 K49 kr2c12 K53 kr1c16 K67 kr3c16 K71
kr0c13 K50 kr2c13 K54 kr1c17 K68 kr3c17 K72
kr0c14 K57 kr2c14 K61 kr1c18 K75 kr3c18 K79
kr0c15 K58 kr2c15 K62 kr1c19 K76 kr3c19 K80
kr1c0 K3 kr3c0 K7 kr1c20 K83 kr3c20 K87
kr1c1 K4 kr3c1 K8 kr1c21 K84 kr3c21 K88
kr1c2 K11 kr3c2 K15 kr1c22 K91 kr3c22 K95
kr1c3 K12 kr3c3 K16 kr1c23 K92 kr3c23 K96
kr1c4 K19 kr3c4 K23 kr1c24 K99 kr3c24 K103
kr1c5 K20 kr3c5 K24 kr1c25 K100 kr3c25 K104
kr1c6 K27 kr3c6 K31 kr1c26 K107 kr3c26 K111
kr1c7 K28 kr3c7 K32 kr1c27 K108 kr3c27 K112
kr1c8 K35 kr3c8 K39
kr1c9 K36 kr3c9 K40
kr1c10 K43 kr3c10 K47
kr1c11 K44 kr3c11 K48
kr1c12 K51 kr3c12 K55
kr1c13 K52 kr3c13 K56
kr1c14 K59 kr3c14 K63
kr1c15 K60 kr3c15 K64

PCB 2 Relay Locations

Relay Name Reference Designator Relay Name Reference Designator Relay Name Reference Designator Relay Name Reference Designator Relay Name Reference Designator
kr0c28 K11 kr4c0 K33 kr6c0 K29 kr4c16 K69 kr6c16 K65
kr0c29 K10 kr4c1 K32 kr6c1 K28 kr4c17 K68 kr6c17 K64
kr0c30 K22 kr4c2 K44 kr6c2 K40 kr4c18 K80 kr6c18 K76
kr0c31 K21 kr4c3 K43 kr6c3 K39 kr4c19 K79 kr6c19 K75
kr1c28 K9 kr4c4 K55 kr6c4 K51 kr4c20 K91 kr6c20 K87
kr1c29 K8 kr4c5 K54 kr6c5 K50 kr4c21 K90 kr6c21 K86
kr1c30 K20 kr4c6 K3 kr6c6 K1 kr4c22 K102 kr6c22 K98
kr1c31 K19 kr4c7 K14 kr6c7 K12 kr4c23 K101 kr6c23 K97
kr2c28 K7 kr4c8 K25 kr6c8 K23 kr4c24 K113 kr6c24 K109
kr2c29 K6 kr4c9 K36 kr6c9 K34 kr4c25 K112 kr6c25 K108
kr2c30 K18 kr4c10 K47 kr6c10 K45 kr4c26 K124 kr6c26 K120
kr2c31 K17 kr4c11 K58 kr6c11 K56 kr4c27 K123 kr6c27 K119
kr3c28 K5 kr4c12 K61 kr6c12 K59 kr4c28 K135 kr6c28 K131
kr3c29 K4 kr4c13 K72 kr6c13 K70 kr4c29 K134 kr6c29 K130
kr3c30 K16 kr4c14 K83 kr6c14 K81 kr4c30 K144 kr6c30 K140
kr3c31 K15 kr4c15 K94 kr6c15 K92 kr4c31 K143 kr6c31 K139
kr5c0 K31 kr7c0 K27 kr5c16 K67 kr7c16 K63
kr5c1 K30 kr7c1 K26 kr5c17 K66 kr7c17 K62
kr5c2 K42 kr7c2 K38 kr5c18 K78 kr7c18 K74
kr5c3 K41 kr7c3 K37 kr5c19 K77 kr7c19 K73
kr5c4 K53 kr7c4 K49 kr5c20 K89 kr7c20 K85
kr5c5 K52 kr7c5 K48 kr5c21 K88 kr7c21 K84
kr5c6 K2 kr7c6 K127 kr5c22 K100 kr7c22 K96
kr5c7 K13 kr7c7 K126 kr5c23 K99 kr7c23 K95
kr5c8 K24 kr7c8 K116 kr5c24 K111 kr7c24 K107
kr5c9 K35 kr7c9 K115 kr5c25 K110 kr7c25 K106
kr5c10 K46 kr7c10 K105 kr5c26 K122 kr7c26 K118
kr5c11 K57 kr7c11 K136 kr5c27 K121 kr7c27 K117
kr5c12 K60 kr7c12 K125 kr5c28 K133 kr7c28 K129
kr5c13 K71 kr7c13 K114 kr5c29 K132 kr7c29 K128
kr5c14 K82 kr7c14 K103 kr5c30 K142 kr7c30 K138
kr5c15 K93 kr7c15 K104 kr5c31 K141 kr7c31 K137

Disassemble the Module

  1. Remove the four screws that secure PCB 2 to the switch assembly.
  2. Gently separate PCB 1 and PCB 2.

Replace the Relay

Note NI recommends using lead-free solder for relay replacement on lead-free assemblies, and lead solder for relay replacement on lead assemblies.
Note Do not rework lead assemblies using a lead-free work station. Lead solder from the unit could contaminate the station.
Note If a lead-free assembly is reworked with lead solder, label the assembly to indicate this condition. This rework can prevent the same unit from being reworked later on a lead-free solder station, because it could contaminate the station.

Verify that you have the following items:

  • Temperature-regulated soldering iron set to 316 °C (600 °F) for lead solder rework or 371 °C (700 °F) for lead-free solder rework
  • 63/37 Tin/Lead solder (flux core) for lead 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

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. Locate the assembly and serial number labels on the board with the relay you want to replace. White labels indicate the board was assembled using lead solder (Sn 63 Pb 37). Green labels indicate the board was assembled using lead-free solder (Sn 96.5 Ag 3.0 Cu 0.5). Lead-free assemblies have assembly numbers ending in L.
  2. Replace the relay as you would any other through-hole part. Trim the replaced relay to no more than 0.41 mm (0.016 inch) from the PCB.

Reassemble the Module

Complete Disassemble the Module in reverse order to reassemble your module.

Note In NI-SWITCH 3.1 or later, you can use the Switch Soft Front Panel to reset the relay count after you have replaced a failed relay. Refer to the NI-SWITCH Soft Front Panel for more information