SWB-2811 Overview

SWB-2811 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-2811 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 8×21 Matrix
2 1-Wire 8×42 Matrix
3 1-Wire 8×63 Matrix
4 1-Wire 8×84 Matrix
5 1-Wire 8×105 Matrix
6 1-Wire 8×126 Matrix

1-Wire 8×21 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 card1r2 and c1 result in the following connection:

  • signal connected to CARD1R2 is routed to C1

Relay Names

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

  • kCARD1AB0
  • kCARD1AB1
  • kCARD1AB2
  • kCARD1AB3
  • kCARD1AB4
  • kCARD1AB5
  • kCARD1AB6
  • kCARD1AB7
  • kCARD1R0C0...kCARD1R0C20
  • kCARD1R1C0...kCARD1R1C20
  • kCARD1R2C0...kCARD1R2C20
  • kCARD1R3C0...kCARD1R3C20
  • kCARD1R4C0...kCARD1R4C20
  • kCARD1R5C0...kCARD1R5C20
  • kCARD1R6C0...kCARD1R6C20
  • kCARD1R7C0...kCARD1R7C20

SWB-2811 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 (K17, K58, K83, and K116) 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 K16 kcard1r1c15 K31 kcard1r3c17 K97 kcard1r5c19 K98
kcard1ab1 K25 kcard1r1c16 K39 kcard1r3c18 K56 kcard1r5c20 K99
kcard1ab2 K49 kcard1r1c17 K47 kcard1r3c19 K65 kcard1r6c0 K146
kcard1ab3 57 kcard1r1c18 K24 kcard1r3c20 K66 kcard1r6c1 K153
kcard1ab4 K82 kcard1r1c19 K32 kcard1r4c0 K100 kcard1r6c2 K160
kcard1ab5 K91 kcard1r1c20 K33 kcard1r4c1 K108 kcard1r6c3 K147
kcard1ab6 K115 kcard1r2c0 K50 kcard1r4c2 K117 kcard1r6c4 K154
kcard1ab7 K124 kcard1r2c1 K59 kcard1r4c3 K101 kcard1r6c5 K161
kcard1r0c0 K1 kcard1r2c2 K67 kcard1r4c4 K109 kcard1r6c6 K148
kcard1r0c1 K9 kcard1r2c3 K51 kcard1r4c5 K118 kcard1r6c7 K155
kcard1r0c2 K18 kcard1r2c4 K60 kcard1r4c6 K102 kcard1r6c8 K162
kcard1r0c3 K2 kcard1r2c5 K68 kcard1r4c7 K110 kcard1r6c9 K149
kcard1r0c4 K10 kcard1r2c6 K52 kcard1r4c8 K119 kcard1r6c10 K156
kcard1r0c5 K19 kcard1r2c7 K61 kcard1r4c9 K103 kcard1r6c11 K157
kcard1r0c6 K3 kcard1r2c8 K69 kcard1r4c10 K111 kcard1r6c12 K150
kcard1r0c7 K11 kcard1r2c9 K53 kcard1r4c11 K120 kcard1r6c13 K151
kcard1r0c8 K20 kcard1r2c10 K62 kcard1r4c12 K104 kcard1r6c14 K158
kcard1r0c9 K4 kcard1r2c11 K70 kcard1r4c13 K112 kcard1r6c15 K145
kcard1r0c10 K12 kcard1r2c12 K54 kcard1r4c14 K121 kcard1r6c16 K152
kcard1r0c11 K21 kcard1r2c13 K63 kcard1r4c15 K105 kcard1r6c17 K159
kcard1r0c12 K5 kcard1r2c14 K71 kcard1r4c16 K113 kcard1r6c18 K106
kcard1r0c13 K13 kcard1r2c15 K55 kcard1r4c17 K122 kcard1r6c19 K114
kcard1r0c14 K22 kcard1r2c16 K64 kcard1r4c18 K73 kcard1r6c20 K107
kcard1r0c15 K6 kcard1r2c17 K72 kcard1r4c19 K81 kcard1r7c0 K167
kcard1r0c16 K14 kcard1r2c18 K40 kcard1r4c20 K74 kcard1r7c1 K174
kcard1r0c17 K23 kcard1r2c19 K48 kcard1r5c0 K125 kcard1r7c2 K175
kcard1r0c18 K7 kcard1r2c20 K41 kcard1r5c1 K132 kcard1r7c3 K168
kcard1r0c19 K15 kcard1r3c0 K75 kcard1r5c2 K139 kcard1r7c4 K169
kcard1r0c20 K8 kcard1r3c1 K84 kcard1r5c3 K126 kcard1r7c5 K176
kcard1r1c0 K26 kcard1r3c2 K92 kcard1r5c4 K133 kcard1r7c6 K163
kcard1r1c1 K34 kcard1r3c3 K76 kcard1r5c5 K140 kcard1r7c7 K170
kcard1r1c2 K42 kcard1r3c4 K85 kcard1r5c6 K127 kcard1r7c8 K177
kcard1r1c3 K27 kcard1r3c5 K93 kcard1r5c7 K134 kcard1r7c9 K164
kcard1r1c4 K35 kcard1r3c6 K77 kcard1r5c8 K141 kcard1r7c10 K171
kcard1r1c5 K43 kcard1r3c7 K86 kcard1r5c9 K128 kcard1r7c11 K178
kcard1r1c6 K28 kcard1r3c8 K94 kcard1r5c10 K135 kcard1r7c12 K165
kcard1r1c7 K36 kcard1r3c9 K78 kcard1r5c11 K142 kcard1r7c13 K172
kcard1r1c8 K44 kcard1r3c10 K87 kcard1r5c12 K129 kcard1r7c14 K179
kcard1r1c9 K29 kcard1r3c11 K95 kcard1r5c13 K136 kcard1r7c15 K166
kcard1r1c10 K37 kcard1r3c12 K79 kcard1r5c14 K143 kcard1r7c16 K173
kcard1r1c11 K45 kcard1r3c13 K88 kcard1r5c15 K130 kcard1r7c17 K180
kcard1r1c12 K30 kcard1r3c14 K96 kcard1r5c16 K137 kcard1r7c18 K123
kcard1r1c13 K38 kcard1r3c15 K80 kcard1r5c17 K144 kcard1r7c19 K131
kcard1r1c14 K46 kcard1r3c16 K89 kcard1r5c18 K90 kcard1r7c20 K138

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.