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OPERATING INSTRUCTIONS NI 9852 2-Port, Low-Spe ed/Fault-Tolerant CAN Module.
NI 9852 Operating Instructions 2 ni.com These operating instructions desc ribe ho w to use the Natio nal Instruments (NI) 9852 module. F o r information about installing, configuring, and programming your system, refer to your system documentation. The NI 9852 module requires the NI 985 x softw are (version 1.
© National Instruments Corp. 3 NI 9852 Operating Instructions Safety Guidelines fo r Hazardous Loca tions The NI 9852 is suitable for use in Cl ass I, Division 2, Groups A, B, C, D, and T4 hazardous locations; Class 1, Zone 2, AEx nA II T4 and Ex nA II T4 hazardous loca tions; and nonhazardous locations only .
NI 9852 Operating Instructions 4 ni.com Caution For Zone 2 applications, install a protection device between the CAN signals and the NI 9852 CAN pins. The de vice must pre v ent the CAN Port-to-COM voltage from e xceeding 55 V if there is a transient ov ervoltage condition.
© National Instruments Corp. 5 NI 9852 Operating Instructions Each port has two isolat ed common pins (COM) that are internally connected to the isolated referenc e of the module and serve as the reference ground for CAN_H and CAN_L. Connect the CAN bus reference ground (sometimes referre d to as CAN_V–) to the COM pin.
NI 9852 Operating Instructions 6 ni.com Table 1. Pin Assignments for CAN0 Connector Pin Signal 1 No Connection (NC) 2 CAN_L 3 COM0 4 NC 5 SHLD 6 COM0 7 CAN_H 8 NC 9 V SUP0 6 7 8 9 1 2 3 4 5.
© National Instruments Corp. 7 NI 9852 Operating Instructions Table 2. Pin Assignments for CAN1 Connector Pin Signal 1 No Connection (NC) 2 CAN_L 3 COM1 4 NC 5 SHLD 6 COM1 7 CAN_H 8 NC 9 V SUP1 6 7 8.
NI 9852 Operating Instructions 8 ni.com CAN Bus T opology and T e rmination A CAN bus consists of two or more CAN nodes cabled together . The CAN_H and CAN_L pins of each node are connected to the main CAN bus cable through a short con nection kno wn as a “stub .
© National Instruments Corp. 9 NI 9852 Operating Instructions Figure 1. CAN Bus T opology and T ermination Resistor Lo cations Connecting a CAN Bus to the NI 9852 Each port of the NI 9852 can be connected to any location on a CAN bus.
NI 9852 Operating Instructions 10 ni.com Figure 2. Connecting Both Ports of th e NI 9852 to CAN Buses CAN1 CAN Device CAN0 NI 9852 CAN Cable (With Optional Shield) (SHLD) CAN_H CAN_L V sup1 COM1 (SHLD.
© National Instruments Corp. 11 NI 9852 Operating Instructions Cabling Requirements for NI 9852 This section deals wi th cabling specif icatio ns, termination resistors, cable lengths, and the number of CAN nodes that can exist in a system.
NI 9852 Operating Instructions 12 ni.com Determining the Necessary T ermination Resistance for the Board Unlike High-Speed CAN, Low- Speed/F ault-T olerant CAN requires termination at the Lo w-Speed/F ault-T olerant CAN transceiv er instead of on the cable itself.
© National Instruments Corp. 13 NI 9852 Operating Instructions Number of CAN Nodes The maximum number of nodes depends on the electrical characteristics of the nodes on the ne twor k. If all of the nodes meet the requirements of Lo w-Spee d/Fault-T olerant CAN, up to 32 nodes may be connected to the b us.
NI 9852 Operating Instructions 14 ni.com Figure 3. NI 9852 Hardware Overview + _ + _ V SUP0 Ext Pwr Supply 0 COM0 CAN_H CAN_L Ext Pwr Supply 1 V SUP1 COM1 CAN_H CAN_L CAN0 CAN1 CAN T ransceiv er +5 V .
© National Instruments Corp. 15 NI 9852 Operating Instructions Sleep Mode (CompactRIO Only) Y ou can enable sleep mode fo r the CompactRIO system in software. In sleep mode, the syst em consumes less power and may dissipate less heat. T ypically , when a system is in sleep mode, you cannot communicate with th e modules.
NI 9852 Operating Instructions 16 ni.com Specifications The follo wing spec ificat ions are typical for the range – 40 to 70 °C unless otherwise noted. Low-Speed/Fault-T olerant CAN Characteristics T ranscei ver ............ ........... ...........
© National Instruments Corp. 17 NI 9852 Operating Instructions Note Contact NI for Bellcore MTBF specifications at other temperatures or for MIL-HDBK -217F specifications. Power Requirements Power consumption from chassis Activ e mode T ransmitting .
NI 9852 Operating Instructions 18 ni.com Safety Maximum Voltage 1 Connect only v oltages that are wi thin these limits. Port-to-COM ....... ...........
© National Instruments Corp. 19 NI 9852 Operating Instructions Isolation Voltages Port-to-port W ithstand .......... ............ ........... ... 500 V rms , 5 s Continuous .......... ........... ........... . 6 0 VDC, Measurement Category I Port-to-earth ground W ithstand .
NI 9852 Operating Instructions 20 ni.com Hazardous Locations U.S. (UL) ........ ........... ........... ........... . Class I, Di vision 2, Groups A, B, C, D, T4; Class I, Zone 2, AEx nA II T4 Canada (C-UL) ..................... ........... . C lass I, Division 2, Groups A, B, C, D, T4; Class I, Zone 2, Ex nA II T4 Europe (DEMKO).
© National Instruments Corp. 21 NI 9852 Operating Instructions Storage humid ity .......... ........... .......... 5 to 95% RH, noncondensing Maximum altitude.......... ......... .......... 2,000 m Pollution Degree (IEC 60664) .......... 2 Shock and Vibration T o meet these spec ifications, you must pan el mount the CompactRIO system .
NI 9852 Operating Instructions 22 ni.com Electromagnetic Compatibility This product is designed to meet the requirements of the following standards of EMC for electica l equipment for measurement, con.
© National Instruments Corp. 23 NI 9852 Operating Instructions Note Refer to the Declaration of Co nformity (DoC) for this product for any additio nal regulatory compliance information.
NI 9852 Operating Instructions 24 ni.com Waste Electrical and Electronic Equipment (WEEE) EU Customers At the end of their life c ycle, all products must be sent to a WEEE recycling center . For more information about WEEE recy cling centers and National Instruments WEEE initiativ es, visit ni.
© National Instruments Corp. 25 NI 9852 Operating Instructions National Instruments Contact Information National Instruments corporate headquarters is located at 11500 North Mopac Expressway , Austin, T exas, 78759-3504. National Instruments also has of fi ces located around the world to help address your support needs.
NI 9852 Operating Instructions 26 ni.com South Africa 27 0 11 805 8197, Spain 34 91 640 0085, Sweden 46 (0) 8 587 895 00, Switzerland 41 56 2005151, T aiwan 886 02 2377 2222, Thailand 662 278 6777, T .
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