PXI-7901 16-CH, General-Purpose SPDT Relay Module User’s Manual Recycled Paper
© Copyright 2004 ADLINK Technology Inc. All Rights Reserved. Manual Rev. 1.00: June 28, 2004 Part Number: 50-17010-100 The information in this document is subject to change without prior notice in order to improve reliability, design, and function and does not represent a commitment on the part of the manufacturer.
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Table of Contents How to Use This Manual..............................................................ii Chapter 1 Introduction ..............................................................1 1.1 Features.............................................................................1 1.2 Applications........................................................................2 1.3 Specifications .....................................................................2 1.4 Software Support ............................
How to Use This Manual This User Manual is designed to assist users in the installation of the ADLINK PXI-7901, 16-CH General Purpose SPDT Relay PXI Switch module. Chapter 1 Introduction Gives an outline and overview of ADLINK switch modules’ features, specifications, and applications. Chapter 2 Installation Describes how to install a switch module into a PXI chassis. For software library and utilities installation, please refer to the Software Users’ Guide.
1 Introduction ADLINK PXI-7901 is a general-purpose (GP) switch module implementing 16CH independent single-pole double-throw (SPDT) relays (1 Form C). PXI-7901 can connect one input to one output, and be used as signal switching or routing for measurement systems as well as ATE. Relays of PXI-7901 can be updated by either direct-update mode or auto-scan mode. The latter mode supports scanlist of 1k-sample for deterministic scanning. PXI trigger functions are fully supported and software programmable.
1.2 Applications • • • • • • • Industrial ON/OFF control External high power relay driving and signal switching Laboratory automation Industrial automation Switch contact status sensing Limit switch monitoring Cooperating with other modules such as A/D and D/A peripherals to implement a data acquisition and control system 1.3 Specifications Relay Output • • • • • • • • Number of channels: 16 Relay type: SPDT (1 Form C), non-latching Switching capacity: • Max. switching current: 3A • Max.
Safety functions • • Emergency shutdown • Logic level: 3.
2 Installation This chapter describes the installation process for the ADLINK switch module. Please read the contents of the package and the disassembling information carefully as they are important in the implementation of the ADLINK switch module. 2.
Note: DO NOT APPLY POWER TO THE MODULE IF IT HAS BEEN DAMAGED. You are now ready to install the PXI-7901. 2.3 Mechanical Drawing Figure 1: ADLINK Switch Module ADLINK switch module is packaged in a Eurocard form factor compliant with PXI Specifications measuring 160 mm in length and 100 mm in height (not including connectors). A 62-pin connector is located at the front panel for wiring purposes and the J1/J2 IEC connectors in the rear are used to link the chassis backplane.
Figure 2: Installing the switch module into a PXI platform Installation • 7
3 Signal Connection 3.1 PXI-7901 Topology The PXI-7901 has 16 independent SPDT Relays onboard. Each relay has three terminals, NC (normally closed), NO (normally opened), and COM (common). When a relay is in its reset (de-energized) state, the NC connects to COM; while in set (energized) state, the NO connects to COM. Thus all signal paths on PXI-7901 are inherently break-before-make. After power-up, all relays are in their reset (de-energized) state; i.e. NC connects to COM. 3.
Signal Name Type NO[15..0] NC[15..0] COM[15..0] Input/Output Input/Output Input/Output AUX[7..0] Input/Output TRG_IN Input S_ADV Output SHDNn Input +5V out Output GND NC Output Not Connected Description Normally opened terminal of relays Normally closed terminal of relays Common terminal of relays Programmable Digital I/O with tri-state control. AUX[2..0] are dual function pins used for triggering, refer to chapter 4 for details.
4 Operation Theorem 4.1 Hardware Block Diagram The ADLINK PXI Switch Module features an onboard FPGA for relay switching control, trigger control, scanlist storage and sequencing. The PXI triggering and synchronization functions, such as Star Trigger and Trigger Bus are also supported.
4.2 Operation Mode The ADLINK PXI Switch Module provides two relay operation modes to accommodate different application requirements. Direct-update The Switch Module updates the relay pattern immediately upon receiving a software command. This mode provides a straightforward control over switch module with minimal hardware intervention. If relay contact bouncing is of a concern, users would need to insert software delay. ADLINK recommends the debounce time to be at least 8ms on PXI-7901.
Figure 4 illustrates the available signal sources for the Trigger In signal. Signal names in the solid-line box represent the external (physical) signal on connectors, and signals in the dotted-line box represents switch module’s internal signal.
Handshaking protocol Figures 6 and 7 depict the relationship between Trigger In, Scanner Advanced, and relay pattern in handshaking mode. In Figure 7 the Scanner Advanced is set to pulsating mode.
Once the operation starts and has received a Trigger In signal, the switch module updates the relay pattern to that specified in the first entry of scanlist. TS is the default debounce time for a switch module, i.e. 8 ms for PXI-7901. TAn is the user specified scan delay time in the scanlist entry, indicating the time between the relay being debounced and the exact moment that a measurement device takes a new measurement.
4. scanlist to the switch module afterward. Start auto-scan by sending scan start command to the switch module.
names in the solid-line boxes represent the external (physical) signals on connectors while signals in the dotted-line boxes represent the switch module’s internal signal. Software Trigger Trigger In Signal Scanner Adv. Signal AUX [3…2] Trigger Bus[7..0] Star Trigger In WDT Overflow SHDNn Figure 9: Available signal sources for Trigger Bus[7..0] 4.5 Star Trigger The PXI specification defined 13 matched trigger lines to connect to the first 13 PXI peripheral slots on a PXI backplane.
Software Trigger Trigger In Signal Scanner Adv. Signal Trigger Bus [7…0] Star Trigger Out AUX [7…0] WDT Overflow SHDNn Figure 10: Available signal sources for Star Trigger 4.6 Auxiliary Digital I/O The eight auxiliary digital I/O lines on ADLINK Switch Modules provide versatility to users’ control applications. Each digital I/O line can be input, output or tri-stated. When in output mode, users can still read back the actual logiclevel on the I/O line.
4.7 Hot-Swap The Switch Module can be hot-swapped during hardware failure in noninterruptible or high-availability systems where system shutdown is not an option. PXI-7901 incorporates an onboard hot-swap control mechanism. However the extent of the hot-swap functionality support depends on the operating system and the PXI platform. ® Microsoft Embedded XP supports the native hot-swap function.
AUX2/SHDNn Trigger Bus Shutdown Trigger Star Trigger In Figure 12: Available trigger sources for emergency shutdown The default relay pattern for emergency shutdown is All-Off on PXI-7901; users can change the pattern by Windows API. Upon receiving the emergency shutdown trigger, the Switch Module enters shutdown mode, and the relay pattern is switched to the preset state.
Int. WDTimer Trigger Bus WDT Overflow Star Trigger In Figure 13:.Available trigger sources for watchdog timer overflow The watchdog timer overflow interval can be programmed through Windows API. After enabling the watchdog timer, users must periodically reset the timer by software command. If the timer is not being reset within the specified interval, the switch module will generate an overflow signal and set the relay pattern to the one specified by users. This function is disabled by default.
Warranty Policy Thank you for choosing ADLINK. To understand your rights and enjoy all the after-sales services we offer, please read the following carefully: 1. Before using ADLINK’s products please read the user manual and follow the instructions exactly. 2. When sending in damaged products for repair, please attach an RMA application form. 3. All ADLINK products come with a two-year guarantee, repaired free of charge. • The warranty period starts from the product’s shipment date from ADLINK’s factory.
