SWB-2812 Overview

SWB-2812 Pinout

Type A


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Table 1. Signal Descriptions
Signal Description
ABx Analog bus row connection
Cx Column connection
GND Safety interlock ground connection
INTRLK Safety interlock resistor connection
— No connection

Type B


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Table 2. Signal Descriptions
Signal Description
Cx Column connection
GND Safety interlock ground connection
INTRLK Safety interlock resistor connection
— No connection

SWB-2812 Topology

Multiple modules of the same type can be combined. The following table lists possible topologies.

Note You must connect pin 96 (INTERLOCK ENABLE) to pin 48 (GND) with a 500 Ω resistor (500 Ω ±20%, 1/10 W minimum) to allow connection to the analog bus. Refer to the NI SwitchBlock Safety Interlock topic for additional information about this safety feature.
Number of Modules Topology
1 1-Wire 16×9 Matrix
2 1-Wire 16×18 Matrix
3 1-Wire 16×27 Matrix
4 1-Wire 16×36 Matrix
5 1-Wire 16×45 Matrix
6 1-Wire 16×54 Matrix

1-Wire 16×9 Matrix

Module software name: Configured Topology (NISWITCH_TOPOLOGY_CONFIGURED_TOPOLOGY)

Hardware Diagram


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Making a Connection

The immediate operation, the niSwitch Connect Channels VI or the niSwitch_Connect function with parameters card1r1 and c1 result in the following connection:

  • signal connected to CARD1R1 is routed to C1

Relay Names

Refer to the following list for relay names of one module.

  • kCARD1AB0...kCARD1AB15
  • kCARD1R0C0...kCARD1R0C8
  • kCARD1R1C0...kCARD1R1C8
  • kCARD1R2C0...kCARD1R2C8
  • kCARD1R3C0...kCARD1R3C8
  • kCARD1R4C0...kCARD1R4C8
  • kCARD1R5C0...kCARD1R5C8
  • kCARD1R6C0...kCARD1R6C8
  • kCARD1R7C0...kCARD1R7C8
  • kCARD1R8C0...kCARD1R8C8
  • kCARD1R9C0...kCARD1R9C8
  • kCARD1R10C0...kCARD1R10C8
  • kCARD1R11C0...kCARD1R11C8
  • kCARD1R12C0...kCARD1R12C8
  • kCARD1R13C0...kCARD1R13C8
  • kCARD1R14C0...kCARD1R14C8
  • kCARD1R15C0...kCARD1R15C8

SWB-2812 Relay Replacement

The module uses reed relays.

Note The module uses a custom lead length to meet safety standards. Trim leads per rework instructions or use one of the custom relays from the relay kit.
Relay Relay Manufacturer Part Number
Matrix Meder MS05-BV50980
Safety (Reference Designators K181- K188) Tyco Electronics 5-1462039-8
Relay Kit Part Number
National Instruments (10 matrix relays) 781450-10
National Instruments (10 safety relays) 781089-10

Complete the following sets of steps to locate and replace a failed relay.

Locate the 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 and table for relay locations.
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The relay names in the following table correspond to a single-card device.

Relay Name Reference Designator Relay Name Reference Designator Relay Name Reference Designator Relay Name Reference Designator
kcard1ab0 K174 kcard1r2c6 K34 kcard1r7c1 K93 kcard1r11c5 K144
kcard1ab1 K175 kcard1r2c7 K35 kcard1r7c2 K94 kcard1r11c6 K137
kcard1ab2 K176 kcard1r2c8 K36 kcard1r7c3 K95 kcard1r11c7 K136
kcard1ab3 K177 kcard1r3c0 K42 kcard1r7c4 K96 kcard1r11c8 K135
kcard1ab4 K178 kcard1r3c1 K43 kcard1r7c5 K97 kcard1r12c0 K146
kcard1ab5 K179 kcard1r3c2 K44 kcard1r7c6 K89 kcard1r12c1 K147
kcard1ab6 K180 kcard1r3c3 K45 kcard1r7c7 K88 kcard1r12c2 K148
kcard1ab7 K173 kcard1r3c4 K46 kcard1r7c8 K87 kcard1r12c3 K149
kcard1ab8 K7 kcard1r3c5 K47 kcard1r8c0 K100 kcard1r12c4 K150
kcard1ab9 K15 kcard1r3c6 K39 kcard1r8c1 K101 kcard1r12c5 K151
kcard1ab10 K24 kcard1r3c7 K38 kcard1r8c2 K102 kcard1r12c6 K81
kcard1ab11 K32 kcard1r3c8 K37 kcard1r8c3 K103 kcard1r12c7 K90
kcard1ab12 K40 kcard1r4c0 K50 kcard1r8c4 K104 kcard1r12c8 K98
kcard1ab13 K48 kcard1r4c1 K51 kcard1r8c5 K105 kcard1r13c0 K153
kcard1ab14 K56 kcard1r4c2 K52 kcard1r8c6 K108 kcard1r13c1 K154
kcard1ab15 K65 kcard1r4c3 K53 kcard1r8c7 K109 kcard1r13c2 K155
kcard1r0c0 K1 kcard1r4c4 K54 kcard1r8c8 K110 kcard1r13c3 K156
kcard1r0c1 K2 kcard1r4c5 K55 kcard1r9c0 K117 kcard1r13c4 K157
kcard1r0c2 K3 kcard1r4c6 K59 kcard1r9c1 K118 kcard1r13c5 K58
kcard1r0c3 K4 kcard1r4c7 K60 kcard1r9c2 K119 kcard1r13c6 K106
kcard1r0c4 K5 kcard1r4c8 K61 kcard1r9c3 K120 kcard1r13c7 K114
kcard1r0c5 K6 kcard1r5c0 K67 kcard1r9c4 K121 kcard1r13c8 K123
kcard1r0c6 K9 kcard1r5c1 K68 kcard1r9c5 K122 kcard1r14c0 K160
kcard1r0c7 K10 kcard1r5c2 K69 kcard1r9c6 K113 kcard1r14c1 K161
kcard1r0c8 K11 kcard1r5c3 K70 kcard1r9c7 K112 kcard1r14c2 K162
kcard1r1c0 K18 kcard1r5c4 K71 kcard1r9c8 K111 kcard1r14c3 K163
kcard1r1c1 K19 kcard1r5c5 K72 kcard1r10c0 K125 kcard1r14c4 K164
kcard1r1c2 K20 kcard1r5c6 K64 kcard1r10c1 K126 kcard1r14c5 K165
kcard1r1c3 K21 kcard1r5c7 K63 kcard1r10c2 K127 kcard1r14c6 K131
kcard1r1c4 K22 kcard1r5c8 K62 kcard1r10c3 K128 kcard1r14c7 K138
kcard1r1c5 K23 kcard1r6c0 K75 kcard1r10c4 K129 kcard1r14c8 K145
kcard1r1c6 K14 kcard1r6c1 K76 kcard1r10c5 K130 kcard1r15c0 K167
kcard1r1c7 K13 kcard1r6c2 K77 kcard1r10c6 K132 kcard1r15c1 K168
kcard1r1c8 K12 kcard1r6c3 K78 kcard1r10c7 K133 kcard1r15c2 K169
kcard1r2c0 K26 kcard1r6c4 K79 kcard1r10c8 K134 kcard1r15c3 K170
kcard1r2c1 K27 kcard1r6c5 K80 kcard1r11c0 K139 kcard1r15c4 K171
kcard1r2c2 K28 kcard1r6c6 K84 kcard1r11c1 K140 kcard1r15c5 K172
kcard1r2c3 K29 kcard1r6c7 K85 kcard1r11c2 K141 kcard1r15c6 K152
kcard1r2c4 K30 kcard1r6c8 K86 kcard1r11c3 K142 kcard1r15c7 K159
kcard1r2c5 K31 kcard1r7c0 K92 kcard1r11c4 K143 kcard1r15c8 K166

Replace the Relay

The module uses lead-free assemblies.

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.

Make sure that you have the following items:

  • 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

Replace the relay as you would any other through-hole part. Trim the replaced relay leads to no more than 0.5 mm (0.02 inch) from the PCB.

Note You can use the Switch Soft Front Panel to reset the relay count after you have replaced a failed relay.