SWB-2833 Overview

SWB-2833 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-2833 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 4×71 Matrix
2 2-Wire 4×142 Matrix
3 2-Wire 4×213 Matrix

2-Wire 4×71 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...kCARD1AB3
  • kCARD1R0C0...kCARD1R0C70
  • kCARD1R1C0...kCARD1R1C70
  • kCARD1R2C0...kCARD1R2C70
  • kCARD1R3C0...kCARD1R3C70

SWB-2833 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, and K40) 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 K9 kcard1r0c68 K343 kcard1r1c69 K314 kcard1r2c70 K304
kcard1ab1 K29 kcard1r0c69 K334 kcard1r1c70 K324 kcard1r3c0 K264
kcard1ab2 K49 kcard1r0c70 K344 kcard1r2c0 K243 kcard1r3c1 K253
kcard1ab3 K50 kcard1r1c0 K232 kcard1r2c1 K254 kcard1r3c2 K263
kcard1r0c0 K210 kcard1r1c1 K220 kcard1r2c2 K242 kcard1r3c3 K262
kcard1r0c1 K221 kcard1r1c2 K231 kcard1r2c3 K241 kcard1r3c4 K251
kcard1r0c2 K209 kcard1r1c3 K230 kcard1r2c4 K252 kcard1r3c5 K261
kcard1r0c3 K208 kcard1r1c4 K218 kcard1r2c5 K240 kcard1r3c6 K260
kcard1r0c4 K219 kcard1r1c5 K229 kcard1r2c6 K239 kcard1r3c7 K51
kcard1r0c5 K207 kcard1r1c6 K228 kcard1r2c7 K31 kcard1r3c8 K61
kcard1r0c6 K206 kcard1r1c7 K11 kcard1r2c8 K41 kcard1r3c9 K249
kcard1r0c7 K1 kcard1r1c8 K21 kcard1r2c9 K250 kcard1r3c10 K42
kcard1r0c8 K2 kcard1r1c9 K227 kcard1r2c10 K22 kcard1r3c11 K52
kcard1r0c9 K217 kcard1r1c10 K3 kcard1r2c11 K32 kcard1r3c12 K43
kcard1r0c10 K4 kcard1r1c11 K12 kcard1r2c12 K23 kcard1r3c13 K53
kcard1r0c11 K13 kcard1r1c12 K24 kcard1r2c13 K33 kcard1r3c14 K44
kcard1r0c12 K5 kcard1r1c13 K34 kcard1r2c14 K45 kcard1r3c15 K54
kcard1r0c13 K14 kcard1r1c14 K25 kcard1r2c15 K55 kcard1r3c16 K46
kcard1r0c14 K6 kcard1r1c15 K35 kcard1r2c16 K26 kcard1r3c17 K36
kcard1r0c15 K15 kcard1r1c16 K27 kcard1r2c17 K16 kcard1r3c18 K47
kcard1r0c16 K7 kcard1r1c17 K37 kcard1r2c18 K48 kcard1r3c19 K57
kcard1r0c17 K17 kcard1r1c18 K28 kcard1r2c19 K58 kcard1r3c20 K60
kcard1r0c18 K8 kcard1r1c19 K38 kcard1r2c20 K59 kcard1r3c21 K71
kcard1r0c19 K18 kcard1r1c20 K39 kcard1r2c21 K82 kcard1r3c22 K70
kcard1r0c20 K19 kcard1r1c21 K136 kcard1r2c22 K92 kcard1r3c23 K81
kcard1r0c21 K137 kcard1r1c22 K114 kcard1r2c23 K103 kcard1r3c24 K69
kcard1r0c22 K148 kcard1r1c23 K125 kcard1r2c24 K91 kcard1r3c25 K80
kcard1r0c23 K147 kcard1r1c24 K113 kcard1r2c25 K102 kcard1r3c26 K68
kcard1r0c24 K135 kcard1r1c25 K124 kcard1r2c26 K90 kcard1r3c27 K79
kcard1r0c25 K146 kcard1r1c26 K112 kcard1r2c27 K101 kcard1r3c28 K67
kcard1r0c26 K134 kcard1r1c27 K123 kcard1r2c28 K89 kcard1r3c29 K78
kcard1r0c27 K145 kcard1r1c28 K111 kcard1r2c29 K100 kcard1r3c30 K56
kcard1r0c28 K133 kcard1r1c29 K122 kcard1r2c30 K77 kcard1r3c31 K66
kcard1r0c29 K144 kcard1r1c30 K99 kcard1r2c31 K88 kcard1r3c32 K65
kcard1r0c30 K121 kcard1r1c31 K110 kcard1r2c32 K87 kcard1r3c33 K76
kcard1r0c31 K132 kcard1r1c32 K109 kcard1r2c33 K98 kcard1r3c34 K64
kcard1r0c32 K131 kcard1r1c33 K120 kcard1r2c34 K86 kcard1r3c35 K75
kcard1r0c33 K143 kcard1r1c34 K108 kcard1r2c35 K97 kcard1r3c36 K63
kcard1r0c34 K130 kcard1r1c35 K119 kcard1r2c36 K85 kcard1r3c37 K74
kcard1r0c35 K142 kcard1r1c36 K107 kcard1r2c37 K96 kcard1r3c38 K62
kcard1r0c36 K129 kcard1r1c37 K118 kcard1r2c38 K84 kcard1r3c39 K73
kcard1r0c37 K141 kcard1r1c38 K106 kcard1r2c39 K95 kcard1r3c40 K72
kcard1r0c38 K128 kcard1r1c39 K117 kcard1r2c40 K105 kcard1r3c41 K83
kcard1r0c39 K140 kcard1r1c40 K116 kcard1r2c41 K104 kcard1r3c42 K94
kcard1r0c40 K139 kcard1r1c41 K127 kcard1r2c42 K93 kcard1r3c43 K248
kcard1r0c41 K126 kcard1r1c42 K115 kcard1r2c43 K238 kcard1r3c44 K258
kcard1r0c42 K138 kcard1r1c43 K215 kcard1r2c44 K237 kcard1r3c45 K257
kcard1r0c43 K216 kcard1r1c44 K226 kcard1r2c45 K236 kcard1r3c46 K246
kcard1r0c44 K205 kcard1r1c45 K225 kcard1r2c46 K247 kcard1r3c47 K256
kcard1r0c45 K204 kcard1r1c46 K213 kcard1r2c47 K235 kcard1r3c48 K255
kcard1r0c46 K214 kcard1r1c47 K224 kcard1r2c48 K234 kcard1r3c49 K265
kcard1r0c47 K203 kcard1r1c48 K223 kcard1r2c49 K245 kcard1r3c50 K244
kcard1r0c48 K202 kcard1r1c49 K211 kcard1r2c50 K233 kcard1r3c51 K275
kcard1r0c49 K212 kcard1r1c50 K222 kcard1r2c51 K295 kcard1r3c52 K285
kcard1r0c50 K201 kcard1r1c51 K315 kcard1r2c52 K305 kcard1r3c53 K266
kcard1r0c51 K335 kcard1r1c52 K325 kcard1r2c53 K286 kcard1r3c54 K276
kcard1r0c52 K336 kcard1r1c53 K306 kcard1r2c54 K296 kcard1r3c55 K267
kcard1r0c53 K326 kcard1r1c54 K316 kcard1r2c55 K287 kcard1r3c56 K277
kcard1r0c54 K337 kcard1r1c55 K307 kcard1r2c56 K297 kcard1r3c57 K268
kcard1r0c55 K327 kcard1r1c56 K317 kcard1r2c57 K288 kcard1r3c58 K278
kcard1r0c56 K338 kcard1r1c57 K308 kcard1r2c58 K298 kcard1r3c59 K259
kcard1r0c57 K328 kcard1r1c58 K318 kcard1r2c59 K279 kcard1r3c60 K269
kcard1r0c58 K339 kcard1r1c59 K299 kcard1r2c60 K289 kcard1r3c61 K270
kcard1r0c59 K319 kcard1r1c60 K309 kcard1r2c61 K290 kcard1r3c62 K280
kcard1r0c60 K329 kcard1r1c61 K310 kcard1r2c62 K300 kcard1r3c63 K271
kcard1r0c61 K330 kcard1r1c62 K320 kcard1r2c63 K291 kcard1r3c64 K281
kcard1r0c62 K340 kcard1r1c63 K311 kcard1r2c64 K301 kcard1r3c65 K272
kcard1r0c63 K331 kcard1r1c64 K321 kcard1r2c65 K292 kcard1r3c66 K282
kcard1r0c64 K341 kcard1r1c65 K312 kcard1r2c66 K302 kcard1r3c67 K273
kcard1r0c65 K332 kcard1r1c66 K322 kcard1r2c67 K293 kcard1r3c68 K283
kcard1r0c66 K342 kcard1r1c67 K313 kcard1r2c68 K303 kcard1r3c69 K274
kcard1r0c67 K333 kcard1r1c68 K323 kcard1r2c69 K294 kcard1r3c70 K284

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.