SWB-2834 Overview

SWB-2834 Pinout

Type A


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Table 1. Signal Descriptions
Signal Description
ABxW0 Wire 0 analog bus row connection
ABxW1 Wire 1 analog bus row connection
CxW0 Wire 0 column connection
CxW1 Wire 1 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
CxW0 Wire 0 column connection
CxW1 Wire 1 column connection
GND Safety interlock ground connection
INTRLK Safety interlock resistor connection
No connection

SWB-2834 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 2-Wire 8×34 Matrix
2 2-Wire 8×68 Matrix
3 2-Wire 8×102 Matrix

2-Wire 8×34 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 CARD1R2W0 is routed to C1W0
  • signal connected to CARD1R2W1 is routed to C1W1

Relay Names

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

  • kCARD1AB0...kCARD1AB7
  • kCARD1R0C0...kCARD1R0C33
  • kCARD1R1C0...kCARD1R1C33
  • kCARD1R2C0...kCARD1R2C33
  • kCARD1R3C0...kCARD1R3C33
  • kCARD1R4C0...kCARD1R0C33
  • kCARD1R5C0...kCARD1R1C33
  • kCARD1R6C0...kCARD1R2C33
  • kCARD1R7C0...kCARD1R3C33

SWB-2834 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 Tyco Electronics 7-1462039-8
Safety (Reference Designators K10, K20, K30, K40, K50, K60, K70, and K80) Tyco Electronics 5-1462039-8
Relay Kit Part Number
National Instruments (10 matrix relays) 781678-10
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 figures and table for relay locations.

PCB1 Relay Map


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PCB2 Relay Map


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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 K19 kcard1r1c28 K225 kcard1r3c30 K256 kcard1r5c32 K285
kcard1ab1 K29 kcard1r1c29 K214 kcard1r3c31 K266 kcard1r5c33 K295
kcard1ab2 K49 kcard1r1c30 K224 kcard1r3c32 K245 kcard1r6c0 K313
kcard1ab3 K69 kcard1r1c31 K223 kcard1r3c33 K255 kcard1r6c1 K324
kcard1ab4 K90 kcard1r1c32 K212 kcard1r4c0 K283 kcard1r6c2 K323
kcard1ab5 K112 kcard1r1c33 K222 kcard1r4c1 K294 kcard1r6c3 K312
kcard1ab6 K123 kcard1r2c0 K264 kcard1r4c2 K293 kcard1r6c4 K322
kcard1ab7 K134 kcard1r2c1 K254 kcard1r4c3 K282 kcard1r6c5 K124
kcard1r0c0 K221 kcard1r2c2 K253 kcard1r4c4 K272 kcard1r6c6 K114
kcard1r0c1 K210 kcard1r2c3 K263 kcard1r4c5 K102 kcard1r6c7 K126
kcard1r0c2 K209 kcard1r2c4 K241 kcard1r4c6 K81 kcard1r6c8 K115
kcard1r0c3 K220 kcard1r2c5 K51 kcard1r4c7 K92 kcard1r6c9 K331
kcard1r0c4 K208 kcard1r2c6 K41 kcard1r4c8 K82 kcard1r6c10 K321
kcard1r0c5 K1 kcard1r2c7 K31 kcard1r4c9 K281 kcard1r6c11 K105
kcard1r0c6 K2 kcard1r2c8 K52 kcard1r4c10 K291 kcard1r6c12 K116
kcard1r0c7 K3 kcard1r2c9 K240 kcard1r4c11 K63 kcard1r6c13 K106
kcard1r0c8 K12 kcard1r2c10 K251 kcard1r4c12 K73 kcard1r6c14 K117
kcard1r0c9 K219 kcard1r2c11 K43 kcard1r4c13 K74 kcard1r6c15 K118
kcard1r0c10 K207 kcard1r2c12 K33 kcard1r4c14 K84 kcard1r6c16 K320
kcard1r0c11 K4 kcard1r2c13 K44 kcard1r4c15 K75 kcard1r6c17 K107
kcard1r0c12 K13 kcard1r2c14 K55 kcard1r4c16 K290 kcard1r6c18 K119
kcard1r0c13 K5 kcard1r2c15 K45 kcard1r4c17 K76 kcard1r6c19 K131
kcard1r0c14 K14 kcard1r2c16 K250 kcard1r4c18 K86 kcard1r6c20 K309
kcard1r0c15 K6 kcard1r2c17 K36 kcard1r4c19 K87 kcard1r6c21 K141
kcard1r0c16 K206 kcard1r2c18 K46 kcard1r4c20 K279 kcard1r6c22 K100
kcard1r0c17 K15 kcard1r2c19 K47 kcard1r4c21 K98 kcard1r6c23 K122
kcard1r0c18 K16 kcard1r2c20 K260 kcard1r4c22 K99 kcard1r6c24 K319
kcard1r0c19 K7 kcard1r2c21 K57 kcard1r4c23 K88 kcard1r6c25 K101
kcard1r0c20 K217 kcard1r2c22 K48 kcard1r4c24 K269 kcard1r6c26 K308
kcard1r0c21 K17 kcard1r2c23 K58 kcard1r4c25 K89 kcard1r6c27 K318
kcard1r0c22 K8 kcard1r2c24 K249 kcard1r4c26 K288 kcard1r6c28 K307
kcard1r0c23 K18 kcard1r2c25 K59 kcard1r4c27 K278 kcard1r6c29 K317
kcard1r0c24 K216 kcard1r2c26 K237 kcard1r4c28 K267 kcard1r6c30 K316
kcard1r0c25 K9 kcard1r2c27 K248 kcard1r4c29 K277 kcard1r6c31 K326
kcard1r0c26 K205 kcard1r2c28 K236 kcard1r4c30 K276 kcard1r6c32 K305
kcard1r0c27 K215 kcard1r2c29 K246 kcard1r4c31 K286 kcard1r6c33 K315
kcard1r0c28 K204 kcard1r2c30 K235 kcard1r4c32 K265 kcard1r7c0 K344
kcard1r0c29 K213 kcard1r2c31 K234 kcard1r4c33 K275 kcard1r7c1 K334
kcard1r0c30 K203 kcard1r2c32 K244 kcard1r5c0 K314 kcard1r7c2 K333
kcard1r0c31 K202 kcard1r2c33 K233 kcard1r5c1 K304 kcard1r7c3 K343
kcard1r0c32 K211 kcard1r3c0 K284 kcard1r5c2 K303 kcard1r7c4 K342
kcard1r0c33 K201 kcard1r3c1 K274 kcard1r5c3 K302 kcard1r7c5 K135
kcard1r1c0 K243 kcard1r3c2 K273 kcard1r5c4 K292 kcard1r7c6 K136
kcard1r1c1 K232 kcard1r3c3 K262 kcard1r5c5 K113 kcard1r7c7 K125
kcard1r1c2 K231 kcard1r3c4 K252 kcard1r5c6 K103 kcard1r7c8 K137
kcard1r1c3 K242 kcard1r3c5 K91 kcard1r5c7 K93 kcard1r7c9 K332
kcard1r1c4 K230 kcard1r3c6 K61 kcard1r5c8 K104 kcard1r7c10 K341
kcard1r1c5 K11 kcard1r3c7 K71 kcard1r5c9 K301 kcard1r7c11 K127
kcard1r1c6 K21 kcard1r3c8 K72 kcard1r5c10 K311 kcard1r7c12 K138
kcard1r1c7 K32 kcard1r3c9 K261 kcard1r5c11 K83 kcard1r7c13 K128
kcard1r1c8 K22 kcard1r3c10 K271 kcard1r5c12 K94 kcard1r7c14 K139
kcard1r1c9 K218 kcard1r3c11 K62 kcard1r5c13 K95 kcard1r7c15 K129
kcard1r1c10 K229 kcard1r3c12 K53 kcard1r5c14 K85 kcard1r7c16 K330
kcard1r1c11 K42 kcard1r3c13 K64 kcard1r5c15 K96 kcard1r7c17 K140
kcard1r1c12 K23 kcard1r3c14 K54 kcard1r5c16 K300 kcard1r7c18 K130
kcard1r1c13 K24 kcard1r3c15 K65 kcard1r5c17 K108 kcard1r7c19 K132
kcard1r1c14 K34 kcard1r3c16 K270 kcard1r5c18 K97 kcard1r7c20 K340
kcard1r1c15 K25 kcard1r3c17 K56 kcard1r5c19 K109 kcard1r7c21 K142
kcard1r1c16 K228 kcard1r3c18 K66 kcard1r5c20 K310 kcard1r7c22 K133
kcard1r1c17 K35 kcard1r3c19 K67 kcard1r5c21 K120 kcard1r7c23 K143
kcard1r1c18 K26 kcard1r3c20 K280 kcard1r5c22 K110 kcard1r7c24 K329
kcard1r1c19 K27 kcard1r3c21 K77 kcard1r5c23 K121 kcard1r7c25 K144
kcard1r1c20 K239 kcard1r3c22 K68 kcard1r5c24 K299 kcard1r7c26 K328
kcard1r1c21 K37 kcard1r3c23 K78 kcard1r5c25 K111 kcard1r7c27 K339
kcard1r1c22 K28 kcard1r3c24 K259 kcard1r5c26 K289 kcard1r7c28 K327
kcard1r1c23 K38 kcard1r3c25 K79 kcard1r5c27 K298 kcard1r7c29 K338
kcard1r1c24 K227 kcard1r3c26 K258 kcard1r5c28 K287 kcard1r7c30 K337
kcard1r1c25 K39 kcard1r3c27 K268 kcard1r5c29 K297 kcard1r7c31 K325
kcard1r1c26 K238 kcard1r3c28 K257 kcard1r5c30 K296 kcard1r7c32 K336
kcard1r1c27 K226 kcard1r3c29 K247 kcard1r5c31 K306 kcard1r7c33 K335

Disassemble the Card

Complete the following steps to disassemble the module.

  1. Remove the six screws from the top of PCB1.
  2. Gently separate PCB1 and PCB2.
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    1 PCB13 Screws
    2 PCB2

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.

Reassemble the Card

Complete Disassemble the Card in reverse order to reassemble your switch module.

Note You can use the 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.