PXI-2521 Overview
- Updated2023-02-18
- 3 minute(s) read
PXI-2521 Overview
PXI-2521 Pinout
Signal | Description |
---|---|
CHx+ | Positive signal connection |
CHx- | Negative signal connection |
COMx+ | Routing destination for the corresponding positive signal connection |
COMx- | Routing destination for the corresponding negative signal connection |
PXI-2521 Hardware Diagram
This figure shows the hardware diagram of the module.
Refer to the following list for relay names on the module.
k0...k39
PXI-2521 Topology
Module software name: 2521/40-DPST (NISWITCH_TOPOLOGY_2521_40_DPST)
The module is composed of 40 armature non-latching DPST relays.
For certain applications, you may need to increase the default settling time.
40-DPST Topology
Making a Connection
You can control the channels using the niSwitch Connect Channels VI or the niSwitch_Connect function.
For example, to close the relay of channel 2, call niSwitch_Connect(vi, "ch2", "com2"). To open the relay of channel 2, call niSwitch_Disconnect(vi, "ch2", "com2").
When scanning the module, a typical scan list entry could be ch2->com2;. This entry closes the relay between CH2 and COM2.
PXI-2521 Relay Replacement
The module uses electromechanical armature relays.
Refer to the following table for information about ordering replacement relays.
Replacement Relay | Part Number |
---|---|
Tyco Electronics (relay manufacturer) | 1462043-6 |
NI relay kit (10 relays) | 782461-10 |
Ensure you have the following:
- 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
Complete the following steps to disassemble your module and replace a failed relay.
- 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.
- Locate the relay you want to replace. Relay names are labeled on the front of the
module. The following table maps the relay names to the channel names.
Channel Name Relay Name Channel Name Relay Name ch0 K0 ch20 K20 ch1 K1 ch21 K21 ch2 K2 ch22 K22 ch3 K3 ch23 K23 ch4 K4 ch24 K24 ch5 K5 ch25 K25 ch6 K6 ch26 K26 ch7 K7 ch27 K27 ch8 K8 ch28 K28 ch9 K9 ch29 K29 ch10 K10 ch30 K30 ch11 K11 ch31 K31 ch12 K12 ch32 K32 ch13 K13 ch33 K33 ch14 K14 ch34 K34 ch15 K15 ch35 K35 ch16 K16 ch36 K36 ch17 K17 ch37 K37 ch18 K18 ch38 K38 ch19 K19 ch39 K39 - Replace the relay as you would any other through-hole part. Trim the replaced relay leads to no more than 1 mm (0.04 in.) from the PCB.