User Manual - Contemporary Controls
Contents
1. Al 333 Figure 2 14 Front Panel of the Al2 left AI3 right TD675100 OMJ 20 2 6 7 Connecting Shielded Twisted Pair Bus Networks via RJ 45 Connectors TB5 Some models support twisted pair bus operation via dual connectors This allows insertion of the AI at any location on the bus segment and provides continuous shielding between devices When the TBS port is located at the end of a bus segment passive termination is required at the unused jack to match the cable impedance typically 100 ohms Refer to Figure 2 15 for the RJ 45 connector pin assignments 18 27 36 45 54 63 72 8 1 Figure 2 15 RJ 45 Connector Pin Assignments 2 7 Variable Data Rates Newer ARCNET controller chips support variable data rates up to 10 Mbps However transceivers such as CXS CXB and TPB will only operate at 2 5 Mbps On these AI models there are no provisions for variable data rates as evidenced by the lack of a data rate switch On all other models a data rate switch is present which must be set to the correct speed of the network A table has been provided to aid in setting the 8 position switch Switch positions are labeled 0 7 with position 6 further identified by a2. L E oF amu Figure 2 8 Hub 2 6 Connecting Cables to the The provides either two or three ports preconfigured for either coaxial twisted pair or fiber optic cable More information on designing an ARCNET cabling system can be found in CC s publication ARCNET Tutorial Product Guide Attach the coaxial twisted pair or fiber optic cables to the devices that are being networked in the ARCNET LAN refer to Appendix A to verify that maximum cabling distance specifications are not exceeded TD675100 OMJ 12 2 6 1 Connecting Coaxial Cable Star Networks CXS There are generally two types of coaxial cables that are used with ARCNET RG 59 u and RG 62 u RG 59 u is 75 ohm cable which does not precisely match the impedance of the transceivers used on the AI ports This cable will work but communication distances are reduced compared to RG 62 u because of the higher attenuation of RG 59 u cable We recommend RG 62 u because it is a better match to the transceivers and a full 2000 foot segment distance can be achieved using this cable Both cables support male BNC connectors which the CXS port accommodates When connecting to a CXS port do not apply a terminator or BNC connector to the port Simply connect the coaxial cable to the BNC port
3. A Line of Fixed Port Active Hubs for ARCNET Local Area Networks User Manual TD675100 OMJ CON TEMPORARY NTROLS Trademarks Contemporary Controls ARC Control ARC DETECT and EXTEND A BUS are trademarks or registered trademarks of Contemporary Control Systems Inc ARCNET is a registered trademark of Datapoint Corporation Other product names may be trademarks or registered trademarks of their respective companies TD675100 OMJ Revised April 2010 Copyright Copyright January 1997 2010 by Contemporary Control Systems Inc All rights reserved No part of this publication may be reproduced transmitted transcribed stored in a retrieval system or translated into any language or computer language in any form or by any means electronic mechanical magnetic optical chemical manual or otherwise without the prior written permission of Contemporary Control Systems Inc 2431 Curtiss Street Downers Grove Illinois 60515 USA Tel 1 630 963 7070 Fax 1 630 963 0109 E mail info ccontrols com WWW http www ccontrols com Contemporary Controls Ltd Sovereign Court Two University of Warwick Science Park Sir William Lyons Road Coventry CV4 7EZ UK Tel 44 0 24 7641 3786 Fax 44 0 24 7641 3923 E mail info ccontrols co uk Disclaimer Contemporary Control Systems Inc reserves the right to make changes in the specifications of the product described within this manual at any time without notice and
4. 0675100 0 31 Appendices Appendix A Permissible Segment Lengths A segment is defined as any portion of the complete ARCNET cabling system isolated by one or more hub ports On a hubless or bus system the complete ARCNET cabling system consists of only one segment with several nodes however a system with hubs has potentially many segments An ARCNET node is defined as a device with an active ARCNET controller chip requiring an ARCNET device address Active and passive hubs do not utilize ARCNET addresses and therefore are not nodes Each segment generally supports one or more nodes but in the case of hub to hub connections there is the possibility that no node exists on that segment The permissible cable length of a segment depends upon the transceiver used and the type of cable installed Table A 1 provides guidance on determining the constraints on cabling distances as well as the number of nodes allowed per bus segment The maximum segment distances are based upon nominal cable attenuation figures and worst case transceiver power budgets Assumptions are noted When approaching the maximum limits a link loss budget calculation is recommended When calculating the maximum number of nodes except EJA 485 networks on a bus segment do not count the hub ports that terminate the bus segment as nodes However do consider the maximum length of the bus segment to include the cable attached to the hub ports Several
5. 2 6 2 Connecting Coaxial Cable Bus Networks CXB Some 2 link and repeater models support coaxial bus transceivers CXB which allows the insertion of an AI at any point within a bus segment Usually RG 62 u coaxial cable is used to connect the various nodes and the AI requiring 93 ohms of passive termination at the extreme ends of the bus segment This is accomplished using a BNC terminator BNC TER and BNC connector BNC T at each end A BNC connector is then used to interconnect the various devices within the segment Make sure that all devices are CXB compliant If a bus segment 1 to be connected to a coaxial star port CXS connect the CXS port only at the extreme ends of the bus segment without a passive terminator The CXS port effectively terminates the bus segment without the need for additional termination TD675100 OMJ 13 2 6 3 Connecting Twisted Pair Bus Networks TPB Some AI2 link and repeater models have twisted pair transceivers which allows the insertion of an AI at any point within a bus segment Usually IBM type 3 unshielded twisted pair cable is UTP used although shielded cable can be used as well A removable 5 position screw connector is used to make connections The middle pin is reserved for the shield connection while phases A and B are available on each of two pins to facilitate daisy chain connections within a bus segment or to attach a passive termination at the
6. 485 Wire a maximum of 13 NIMs reduce by one for each AI port in a daisy chain fashion leaving the end devices as either NIMs or AI ports On these NIMs or AI ports insert a jumper at E1 both 485 daughterboards to invoke 120 ohm termination resistors or leave the jumpers open and connect an external terminating resistor to phases A and B Termination should not be applied to any of the NIMs located between the two end NIMs or AI ports of the segment Mixing 485 and 485D can be accomplished by invoking backplane mode on 485 NIMs and non backplane mode on 485D NIMs TD675100 OMJ 18 However 485 or 485D NIMs cannot be mixed with 485 NIMs together on one segment since signal encoding is different Figure 2 11 AC Coupled EIA 485 Option 485 WIRING CHART RJ 11 CONNECTOR TPS TPB 485 485X Figure 2 12 RJ 11 Connections Found CC s NIMs TD675100 0MJ 19 PIN LINE LINE SH SHIELD SHIELD SHIELD LINE LINE 485 485X LINE LINE LINE LINE LINE LINE gt an SLL LINE LINE gt Figure 2 13 Twisted Pair Pinouts NOTE For TPB transceiver LINE is defined at the leading positive phase of the dipulse signal For 485 transceiver LINE is defined as the pin with the more positive applied failsafe bias The 485X transceiver is not polarized Al 2 1
7. CXB FOG ST 5 AI2 485 FOG ST AI2 485X FOG ST Hubs AI3 CXS 5 AI3 485 AI3 485X AI3 485 FOG ST AI3 485X FOG ST AI3 FOG ST TBS5 AI3 FOG ST CXB AI3 FOG ST 485 AI3 FOG ST 485X Accessories AI XFMR AI XFMR E AI DIN BNC T BNC TER Coaxial bus repeater Twisted pair bus repeater DC coupled EI 485 repeater AC coupled EIA 485 repeater Coaxial bus to fiber optic link Twisted pair bus to fiber optic link DC 485 to fiber optic link AC EJA 485 to fiber optic link Coaxial star hub Twisted pair bus hub DC coupled EIA 485 hub AC coupled 485 hub DC coupled EJA 485 to fiber hub AC coupled EIA 485 to fiber hub Twisted pair bus fiber backbone hub Coaxial bus fiber backbone hub DC Coupled EIA 485 fiber backbone hub AC Coupled EIA 485 fiber backbone hub Wall mount transformer 120 Vac nom Wall mount transformer 230 Vac nom DIN rail mounting kit BNC connector 93 ohm BNC terminator Contact factory regarding special requirements TD675100 OMJ 5 TD675100 OMJ 6 2 Installation 2 1 Introduction The AI series 15 intended to be panel mounted into an industrial enclosure or into a wiring closet This can be achieved with either panel mounting brackets or clipping onto DIN rail as described in Section 2 3 2 2 Electromagnetic Compliance The AI series complies with Class A radiated and conducted emissions as defined by CFR 47 Part 15 and EN55022 This equip
8. Mechanical 5 62 distance to DIN rail 1 75 143 44 5 140 7 tT J _ g 56 5 8 6 14 sx z 156 mm _ 3 k ok 0 35 gt 9 2 HEE rt 1 V 5 45 Lo 0 56 139 14 m N _138 amp _ 35 Side View showing DIN rail Clip Front View with Mounting Brackets Retracted Mounting Brackets Extended Optical Power Budget 25 C FOG Fiber Size 850 nm Microns dB 50 125 6 6 62 5 125 10 4 100 140 15 9 Environmental Operating temperature 0 C to 60 C Storage temperature 409 to 85 C TD675100 OMJ 3 Functional Data Rate bps Transceiver 78K 156K 312K 625K 125 2 5M 5M 10M The data rate switch is not present on the CXS CXB and TPB models Compliance ANSI ATA 878 1 Extended timeouts Supports all three extended ARCNET timeouts Hub Repeaters and Link delay 320 ns maximum 2 5 Mbps Unlatch delay time 5 9 us 2 5 Mbps LED indicators RECON yellow STATUS green Regulatory Compliance CE Mark CFR 47 Part 15 Class A TD675100 OMJ 4 14 Ordering Information The AI series is available in several configurations depending upon the application and cable media supported Repeaters AI2 CXB AI2 TPB AI2 485 AI2 485X Links AI2
9. dot indicating the 2 5 Mbps default position A clockwise rotation increases the data rate setting Use the following table to set the data rate TD675100 OMJ 21 Data rate switch set to the default position 6 2 5 Mbps Figure 2 16 Data Rate Switch NOTE On 485X models data rates less than 1 25 Mbps are not supported 2 8 Supporting Extended Timeouts Although seldom used ARCNET networks can be configured for extended timeouts to facilitate geographically larger networks In this situation each network interface module must be configured for the same timeout The AI will work with either of the four available timeout settings but the RECON indicator will function unreliably if the reconfiguration detection circuitry 15 not configured for the same timeout as the network There are four jumper settings on the AI to accommodate extended timeouts On the board is jumper setting E1 The jumper can be found installed in the NORM position This is the factory setting and the default setting for standard ARCNET networks which is the shortest setting The next available setting is marked the next longest is ET2 and the longest is ET3 Simply move the jumper to the desired position With newer ARCNET controller chips the reconfiguration timers are programmable and there may be no appropriate timeout setting To disable the RECON light remove any jumpers from NORM ET1 ET2 or TD675100 OMJ 22 6 100000
10. end devices End devices require a passive terminator that matches the impedance of the cable typically 100 ohms 2 6 4 Connecting Fiber Optic Cable FOG Multimode fiber optic cable is typically available in three sizes 50 125 62 5 125 and 100 140 The larger the size the more energy that can be launched and therefore the greater the distance Bayonet style ST connectors similar in operation to BNC coaxial cable connectors are provided for making the fiber connections Fiber optic connections require a duplex cable arrangement Two unidirectional cable paths provide the duplex link There are two devices on the AI fiber port One device colored light gray 15 the transmitter and the other dark gray is the receiver Remember that light goes out of the light gray To establish a working link between a hub and a network interface module or a hub to another hub the transmitter of point A must be connected to a receiver at point B Correspondingly the receiver at point A must be connected to a transmitter at point B This establishes the duplex link which is actually two simplex links Fiber optic cable is available paired for this purpose Usually the manufacturers labeling is only on one cable of the pair which is handy for identifying which of the two cables 1s which Establish your own protocol for connecting cable between hubs and NIMs in the field using the manufacturers labeling as a guide However remember tha
11. so separate provisions are required for charging If the AC source fails the AI will operate from the battery source TD675100 OMJ 10 0 Figure 2 5 AC Powered with Battery Backup 2 5 Topologies Depending upon the number of ports on the AI the AI can be used as either a repeater link or hub 12 has only two ports and therefore can be used as a repeater or link while the 1 has three ports and can be used as a hub 2 5 1 Repeater The repeater extends wiring segments of the same type of cable Coaxial cable or twisted pair segments can be extended using repeaters ae 1 Figure 2 6 Repeater TD675100 OMJ 11 2 5 2 Link A link converts one type of cabling segment into another Using two Als in a link application either a coaxial or twisted pair segment can be converted into a fiber segment EN Figure 2 7 Link 2 5 3 Hub With three port the hub or star topology configuration be implemented AI3s also be cascaded order to create a distributed star topology
12. to chassis within the AI The input connections are reverse voltage protected Figure 2 1 DC Powered 2 4 2 Redundant DC Powered Redundant diode isolated DC power inputs are provided on the AI for those applications where there is a concern that the AI remain operational in the event of a primary power failure Make connections as shown in the diagram Each power supply source must be sized for the full 4 watt load of the AI Do not assume that input currents will be balanced from the two supplies Figure 2 2 Redundant DC Powered TD675100 OMJ 9 2 4 3 Powered If only AC power 1 available the AI can be powered by the secondary of a low voltage transformer whose primary 1s connected to the AC mains The secondary voltage must be in the range of 8 to 24 Vac with the capability of delivering up to 4 VA of apparent power The secondary of the transformer must not be grounded When using a grounded secondary transformer refer to Figure 2 4 For convenience two auxiliary power supplies are available The AI XFMR is intended for 120 Vac primary power while the AI XFMR E is intended for 230 Vac Figure 2 4 AC Powered with Grounded Secondary 2 4 4 AC Powered with Battery Backup The AI can also be powered from both an AC and DC power source Usually the DC source is from a battery supply which 1 connected as the DC powered option Refer to the diagram for details In this application the AI does not charge the battery
13. 00000 R Figure 2 17 Extended Timeout Jumpers TD675100 OMJ 23 0675100 0 24 3 3 1 Theory of Operation 3 1 1 States When the AI has installed expansion modules the timing module waits for the first instance of an ARCNET signal on any one of its ports During this time the hub is in IDLE mode with all port receivers enabled and all port transmitters disabled As soon as the first port senses an ARCNET signal there should only be one in anormally operating ARCNET system the hub enters the ACTIVE state with the receiving port left enabled and all other receivers disabled During this state all transmitters are enabled with the receiving port s transmitter disabled This allows all nodes on the network to hear a particular node which has momentary control of the network while squelching any echoes from unterminated lines open or shorted cables The AI remains in the ACTIVE mode until the last ARCNET signal is received by the originating port To determine if the last signal has been sent the AI times the absence of an ARCNET logic 1 Once the unlatch delay time is exceeded typically 5 9 us when operating at 2 5 Mbps the AI reverts back to the IDLE State 3 1 2 Signal Regeneration To generate an ARCNET signal requires the synthesis of signals 1 and P2 These 100 ns non overlapping pulses when operating at 2 5 Mbps in turn drive the various transceivers on each of the p
14. 1 on the daughterboard If the NIM is located between the two end NIMs or AI ports remove all three jumpers If external termination is desired remove the middle jumper at 1 and provide the external termination Figure 2 9 DC Coupled EIA 485 Option 485 TD675100 OMJ 16 For EIA 485 DC operation it is very important that all devices on the wiring segment be referenced to the same ground potential in order that the common mode voltage requirement 7 Vdc of EIA 485 specification is achieved This be accomplished by running a separate ground wire between all Als and computers pin SH has been provided for such a connection on the AI or by relying upon the third wire ground of the power connector assuming that the DC power return is connected to chassis ground on all computers this is the case with the AI Another approach would be to connect the DC common of each computer to a cold water pipe Connected systems each with different elevated grounds can cause unreliable communications or damage to the EIA 485 differential drivers Therefore it 15 important that an adequate grounding method be implemented 2 RXIN Figure 2 10 Each 485 hub port has provisions for applying bias and termination Make sure common mode voltage does not exceed 7 Vdc In summary segments of 485 485D connected NIMs can be extended through the use of active hubs Select an AI model with a 485
15. 75100 0OMJ ll List of Figures Figure 2 1 Figure 2 2 Figure 2 3 Figure 2 4 Figure 2 5 Figure 2 6 Figure 2 7 Figure 2 8 Figure 2 9 Figure 2 10 Figure 2 11 Figure 2 12 Figure 2 13 Figure 2 14 Figure 2 15 Figure 2 16 Figure 2 17 DC POW eaten 9 Redundant DC Powered 9 AC POW E 10 AC Powered with Grounded Secondary 10 AC Powered with Battery Backup 11 11 12 12 DC Coupled 485 Option 485 16 Each 485 Hub Port Has Provisions For Applying Bias and Termination 17 AC Coupled EIA 485 Option 485 19 11 Connections Found on CC s NIMs 19 Al Twisted P air Pinouts 20 Front Panel of the AI2 20 RJ 45 Connector Pin Assignments 21 Data Rate SwWife uu uu uu u uuu S s 22 Extended Timeout Jumpers 23 TD675100 0MJ 1 Introduction 1 1 Description ARCNET Interconnect AI series of external fixed port hubs provide a low cost method of expanding ARCNET local area networks Expansion methods include the use of repeaters links and hubs Repeaters are used to extend a wiring segment using the same cabling technology A link allows the mixing of two cabling technologies within one segm
16. N THE PURCHASER THE ABOVE WARRANTY IS IN LIEU OF ANY AND ALL OTHER WARRANTIES EXPRESSED OR IMPLIED OR STATUTORY INCLUD ING THE WARRANTIES OF MERCHANTABILITY FITNESS FOR PARTICULAR PURPOSE OR USE TITLE AND NONINFRINGEMENT Repair or replacement as provided above shall be the purchaser s sole and exclusive remedy and CC s exclusive liability for any breach of warranty TD675100 OMJ 29 Technical Support Contemporary Controls U S A will provide technical support on its products by calling 1 630 963 7070 each weekday except holidays between 8 00 a m and 5 00 p m Central time Contemporary Controls Ltd U K will provide technical support on its products by calling 44 0 24 7641 3786 each weekday except holidays between 8 00 a m and 5 00 p m United Kingdom time If you have a problem outside these hours leave a voice mail message the CC after hours mailbox after calling our main phone number You can also fax your request by calling 1 630 963 0109 U S or 44 0 24 7641 3923 U K or contact us via e mail at info ccontrols com info ccontrols co uk You can visit our web site at www ccontrols com When contacting us please leave a detailed description of the problem We will contact you by phone the next business day or in the manner your instructions indicate We will attempt to resolve the problem over the phone If unresolvable the customer will be given an RMA number in order that the product may be
17. bus transceivers require a minimum distance between nodes Adhere to this minimum since unreliable operation can occur TD675100 OMJ 32 Appendix A continued Permissible Cable Lengths and Nodes Per Segment Trans ceiver CXS CXS CXB FOG FOG FOG TPB 485 485X Description Cable Connectors coaxial star RG 62 u BNC coaxial star RG 59 u BNC coaxial bus RG 62 u BNC duplex fiber optic 50 125 SMA or ST duplex fiber optic 62 5 125 SMA or ST duplex fiber optic 100 140 SMA or ST twisted pair bus type3 RJ 11 DC coupled 485 type 3 RJ 11 AC coupled 485 IBM 11 l This represents the minimum distance between any two nodes or between a node and a hub 2 May require a jumper change the AI to achieve this distance Table A 1 Permissible Cable Length and Nodes Per Segment TD675100 OMJ 33 Cable Length Min 0 0 6ft 2m 0 0 02 6ft 2m 0 0 2 5 Mbps Max Nodes Max Bus Segment Notes 2000ft 610m N A 5 5 dB 1000ft max 1500ft 457m N A 7 0 dB 1000ft max 1000ft 305m 8 5 5 dB 1000ft max 3000ft 9 15m N A 4 3 dB km max 6000ft 1825m N A 4 3 dB km max 9000ft 2740m N A 4 0 dB km max 400 122 8 900ft 274m 17 DC coupled 700ft 213m 13 transformer isolated 0675100 34 Appendix Declaration of Conformity Applied Council Directives Low Voltage Directive 2006 95 EC General Product Safety Directive 2001 95 Electromagneti
18. c Compatibility Directive 2004 108 EC Restriction of Hazardous Substances Directive 2002 95 EC Waste Electrical and Electronic Equipment Directive 2002 96 EC Standards to which Conformity is Declared EN 55022 2006 1 2007 Class A Limits and Methods of Measurement of Radio Disturbance Characteristics of Information Technology Equipment EN 55024 1998 1 2001 A2 2003 Information Technology Equipment Immunity Characteristics Limits and Methods of Measurement Manufacturer Contemporary Control Systems Inc 2431 Curtiss Street Downers Grove IL 60515 USA Authorized Representative Contemporary Controls Ltd Sovereign Court Two University of Warwick Science Park Sir William Lyons Road Coventry CV4 7EZ UNITED KINGDOM TD675100 OMJ 35 Type of Equipment Industrial local area network repeater link or hub Directive AI2 CXB 5 AI2 485 AI2 485X AI2 CXS FOG ST AI2 TPB FOG ST AI2 485 FOG ST AI2 485X FOG ST AI3 CXS 5 AI3 485 AI3 485X AI3 485 FOG ST AI3 485X FOG ST AI3 FOG ST TBS5 AI3 FOG ST CXB AI3 FOG ST 485 AI3 FOG ST 485X Manufacturer s Declaration The specified products conform to the directives and standards listed above April 2010 RoHSVY TD675100 OMJ 36
19. compatible port Connect one end of the segment to this port following the same termination rules as used for a TD675100 OMJ 17 NIM This hub port counts as one NIM when cable loading 1 being calculated The NIM electrically closest to the hub port should not have any termination or bias applied Follow the same rules for other segments attached to different hub ports Each hub effectively extends the segment another 900 feet Maintain the same cabling polarity as the NIMs by using cable connections that do not invert the signals 2 6 6 Connecting AC Coupled EIA 485 Networks 485X The AC coupled 485 transceiver offers advantages over the DC coupled 485 No bias adjustments need to be made since each transceiver has its own fixed bias network isolated by a pulse transformer Unlike the DC coupled EIA 485 wiring polarity is unimportant Either inverted or straight through cable can be used or even mixed within one AC coupled network Much higher common mode voltage levels can be achieved with AC coupling due to the transformer coupling which has a 1000 Vdc breakdown rating There are disadvantages to the AC coupled transceiver as compared to the DC coupled technology The DC coupled distances are longer 900 feet compared to the AC coupled distance 700 feet and the node count is higher with DC The AC coupled transceiver will only operate between 1 25 Mbps and 10 Mbps The cabling rules of the 485X are similar to the
20. d connect an external resistor across phase A and phase Failsafe Bias In addition to the termination it is also necessary to apply bias to the twisted pair network so that when the line 15 floated differential receivers will not assume an invalid logic state There are two precision bias resistors Rb of equal value on each daughterboard One resistor 15 tied to the 5V line while TD675100 OMJ 15 the other is tied to ground Each resistor has a jumper associated with it If the two jumpers are installed the resistor tied to 5V is connected to the phase A signal line while the grounded resistor is connected to the phase line This voltage drop will bias the differential receivers into a defined state when no differential drivers are enabled Differential receivers typically switch at or near zero volts differential and are guaranteed to switch at 200 mV Through the transition point 70 mV of hysteresis will be experienced Therefore a positive bias of 200 mV or greater will ensure a defined state We recommend that bias be applied to both ends of the wiring segment by installing the two end jumpers located at position El on the daughterboard This is to be done for only the AI ports or NIMs located at the ends of the segment All other NIMs will have their jumpers removed The termination and bias rules are simple If the NIM or AI port is located at the extreme ends of the segment install all three jumpers at location
21. d the should be returned Contact our Customer Service department TD675100 OMJ 28 4 Service Warranty Contemporary Controls CC warrants its new product to the original purch aser for two years from the product shipping date Product returned to CC for repair is warranted for one year from the date that the repaired product is shipped back to the purchaser or for the remainder of the original warranty period whichever is longer If a CC product fails to operate in compliance with its specification during the warranty period CC will at its option repair or replace the product at no charge The customer is however responsible for shipping the product CC assumes no responsibility for the product until it is received CC s limited warranty covers products only as delivered and does not cover repair of products that have been damaged by abuse accident disaster mis use or incorrect installation User modification may void the warranty if the product is damaged by the modification in which case this warranty does not cover repair or replacement This warranty in no way warrants suitability of the product for any specific application NO EVENT WILL LIABLE FOR ANY DAMAGES INCLUDING LOST PROFITS LOST SAVINGS OR OTHER INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE PRODUCT EVEN IF CC HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES OR FOR ANY CLAIM BY ANY PARTY OTHER THA
22. data link level protocol Class B Throughput reduced to zero and continuous reconfigurations occur Normal operation resumed after offending signal removed Class C Complete loss of function Unit resets and normal operation restored without human intervention At no time did the AI fail to return to normal operation or become unsafe during the execution of these tests A copy of the Declaration of Conformity is in the appendix 23 Mounting the AI The AI Series can be snap mounted onto TS 35 DIN rail using the pre attached DIN rail clip If the clip 1 removed the unit can be panel mounted using the adjustable brackets affixed to rear of the enclosure See the dimensional drawing in Section 1 3 for details 24 Powering the The AI requires either low voltage AC or DC power in order to operate Consult the specifications for power requirements Power is provided to a four pin removable keyed connector and there are several methods for providing power TD675100 OMJ 8 2 4 1 DC Powered Make connections as shown in the diagram The AI Series incorporates a DC DC converter that accepts a wide voltage range 10 36 Vdc and converts the voltage for internal use Input current varies with input voltage so it is important to size the power conductors accordingly Input power to the AI does not exceed 4 watts therefore at 10 Vdc the input current is approximately 400 mA The ground connection to AI is connected
23. ent A hub allows for the addition of a segment and support for distributed star topologies The AI can implement all three expansion methods depending upon the number of ports on the AI The 12 provides two ports for repeater and link applications while the implements the hub function However the AI2 and utilize the same robust hub timing electronics found in Contemporary Controls CC s MOD HUB series of modular active hubs This includes precision delay line timing digitally controlled timers for dependable operation and reduced bit jitter The AI operates from either low voltage AC or DC power For DC operation a voltage source In the range of 10 to 36 volts is required For AC operation a voltage source in the range of 8 to 24 volts is required Companion regulatory approved transformers are available under separate model numbers for UL and CE Mark applications The timing electronics uses a precision delay line timing generator which regenerates the incoming ARCNET signal without introducing excessive bit jitter The regenerated signal is then sent to all other ports on the hub A watchdog timer is included to prevent the possibility of hub lockup eliminating the necessity of cycling power on a failed hub The hub unlatch delay time is derived from a crystal oscillator for high accuracy and repeatability The AI series supports variable data rates from 78 kbps to 10 Mbps in order to accommodate newer ARCNET controll
24. er chips and popular EIA 485 transceivers TD675100 OMJ 1 Active hubs increase the robustness of ARCNET networks They maximize the distance that can be achieved on each cable segment up to 2000 feet on coaxial segments They prevent interference to the network by squelching reflections caused by open or shorted cable segments attached to the hub Unused hub ports need not be terminated Active hubs allow for a distributed star topology thereby minimizing the cabling required in a plant Active links and repeaters provide extensions to bus systems or bridging to other cable media 1 2 Features Compatible with the baseband ARCNET network e Compatible with all CC s network interface modules NIMs and active hubs e Supports either 2 or 3 ports e Panel mount enclosure e Configurations available for either link repeater or hub operation e Supports coaxial twisted pair and fiber optic cable e LED indicator identifies reconfiguration of the network e Minimizes bit jitter with precision delay line timing e Watchdog timer prevents hub lockup e Hub unlatch delay digitally controlled e Low voltage AC or DC powered e Provisions for redundant power supplies e Supports variable data rates from 78 kbps to 10 Mbps e Accommodates AC or DC coupled EIA 485 networks TD675100 OMJ 2 1 3 Specifications Electrical DC AC Input voltage 10 36 8 24 V Input power 4 W 4 VA Input frequency N A 47 63 Hz
25. ld confuse the RECON LED To disable the RECON LED simply remove any jumper attached to the four timeout positions 3 1 4 Watchdog Timer If no hub activity is sensed after a predetermined time a watchdog timer will automatically reset the AI timing electronics This is to ensure that the AI reestablishes communication after a significant electrostatic or electromagnetic phenomenon without requiring any human intervention 3 2 LED Indicators There are several LED indicators on the AI that aid in determining if the network 15 operating correctly The indicators are as follows TD675100 OMJ 26 ACTIVITY Each port the AI has an associated LED indicator that indicates that ARCNET traffic 1 being received on that port The intensity of the LED will increase somewhat with traffic Transmitted data from that port is not indicated by the ACTIVITY light Therefore disconnected cables open cables or cables attached to disabled ARCNET controller chips will not light the ACTIVITY LED STATUS With power applied and with no network cables connected to the AI or if no valid ARCNET activity is present on any one port on the this indicator will flash at a periodic rate indicating that the AI is functioning but idle If ARCNET activity is present and the internal regeneration of the ARCNET signal is proper this indicator will light telling you that the AI is receiving ARCNET signals and faithfully reproducing these signals to other
26. ment is intended for use in nonresidential areas Refer to the following notices regard to the location of the installed equipment Note This equipment has been tested and found to comply with the limits for a Class A digital device pursuant to the rules of CFR 47 Part 15 These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in acommercial environment This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instruction manual may cause harmful interference to radio communications Operation of this equipment a residential area 15 likely to cause harmful interference in which case the user will be required to correct the interference at his own expense Warning This is a Class A product as defined in EN55022 In a domestic environment this product may cause radio interference in which case the user may be required to take adequate measures TD675100 OMJ 7 The AI has been tested to EN55024 Generic Immunity Standard Industrial Environment This standard identifies a series of tests requiring the equipment to perform to a particular level during or after the execution of the tests The three classes of performance are defined by CC as follows Class A Normal operation however occasional reconfigurations may occur or throughput reduced due to error recovery algorithm by the ARCNET
27. ode generates reconfigurations continuously as evidenced by the RECON light being continuously lit because this node has a defective receiver on its network interface module Under these circumstances the port activity indicator that corresponds to the port on the AI connected to the chattering node will light brightly while all other port activity indicators will appear dim Disconnecting this cable from the AI will extinguish the RECON indicator and return all other port activity lights to equal brightness thereby isolating the defective node For large installations the time saved in identifying the problem can be immense Port activity indicators can also point out other problems with the network For example port activity indicators light up when the AI is on and each ARCNET compatible device that is connected to the AI is on If a port activity indicator is not on for a device that is properly connected to the AI then disconnect the cable from the port and reconnect the cable to a similar vacant port If the indicator on the other port does not light when the cable is connected check the cable the computer or the network interface module for possible problems If the port activity indicator goes on when the cable is plugged into another port then the problem probably lies with the original port on the AI If an AI port has a line activity indicator that is on but no cable is attached to the connector then the port is defective an
28. orts A precision delay line gated oscillator forms the basis of the regeneration circuitry and was chosen because of the predictable delay experienced from this type of oscillator which is important in reducing bit jitter 485 ports incorporate a return to zero RZ signaling scheme with a logic 1 signal equivalent to the logical OR of TD675100 OMJ 25 1 and P2 These ports accommodate this signal generation while maintaining compatibility with coaxial and fiber optic signals 5 1 3 Timers A simple crystal oscillator and divider are used to develop the unlatch delay time and reconfiguration timers Although not critical the unlatch delay timer is more repeatable from a crystal oscillator However the reconfiguration timer is more critical The reconfiguration timer does not sense a reconfigu ration on the network it only predicts that a reconfiguration will occur This is accomplished by noting that no data has occurred for 82 us at standard timeouts and at 2 5 Mbps Once this timer is exceeded the yellow RECON LED is lit for about 950 ms If the hub is operated on a network with extended ARCNET timeouts jumpers must be set on the timing module to extend the reconfiguration timer to match the network timeouts There are a total of four jumper settings corresponding to the four possible timeouts Newer ARCNET controller chips allow for adjustable reconfiguration timers beyond the original standards These settings cou
29. ports on the AI If this indicator does not light when activity is present on any hub port as it should then the Alis defective RECON Reconfigurations of the network routinely occur as nodes are added to the network and pose no problem to the network When they occur this LED will flash on for one second to facilitate viewing even though the reconfiguration process takes a fraction of a second However frequent reconfigurations can degrade performance of the network as indicated by this LED flashing repeatedly or lighting continuously If this is occurring on your AI you need to isolate the connected computers to find out which node is causing these reconfigurations The cause of frequent reconfigurations could be a faulty network interface module defective cable duplicate node IDs or a high incidence of electrical interference An occasional flash of this light is normal as automatic reconfigurations are feature of ARCNET If this is all that is viewed you can feel well assured that the network is operating properly TD675100 OMJ 27 3 3 Isolating Faulty Nodes with Line Activity Indicators The AI has port activity indicators Each port activity indicator lights whenever the corresponding port on the AI receives ARCNET signals The intensity of these indicator lights changes with the amount of activity and this is how defective nodes can be isolated The worst possible occurrence is the chattering node A chattering n
30. returned to CC for repair Warranty Repair Products under warranty that were not subjected to misuse or abuse will be repaired at no charge to the customer The customer however pays for shipping the product back to CC while CC pays for the return shipment to the customer CC normally ships ground International shipments may take longer If the product has been determined to be misused or abused CC will provide the customer with a quotation for repair No work will be done without customer approval TD675100 OMJ 30 Non Warranty Repair CC provides a repair service for all its products Repair charges are based upon a fixed fee basis depending upon the complexity of the product Therefore Customer Service can provide a quotation on the repair cost at the time a Returned Material Authorization RMA is requested Customers pay the cost of shipping the defective product to CC and will be invoiced for the return shipment to their facility No repair will be performed without customer approval If a product is determined to be unrepairable the customer will be asked if the product can be replaced with a refurbished product assuming one is available Under no circumstances will CC replace a defective product without customer approval Allow ten working days for repairs Returning Products for Repair Return the product to the location where it was purchased by following the instructions at the URL below www ccontrols com rma htm
31. t to connect point A TD675100 OMJ 14 to point requires a paired fiber optic cable and that the light gray connector at one point must connect to a dark gray connector at the other point 2 6 5 Connecting DC Coupled EIA 485 Networks 485 A removable 5 position screw connector is provided for each DC coupled EIA 485 segment Two connections are provided for each differential signal phases A and B The middle pin connects to a 100 ohm resistor referenced to DC common This segment can be up to 900 feet long of IBM type 3 unshielded twisted pair cable and as many as 17 nodes can occupy the segment Make sure that the phase integrity of the wiring remains intact All phase A signals on the AI network interface modules and other hubs must be connected together The same applies to phase B Figure 2 6 has been provided to assist in connecting the various devices If shielded cable is to be used the shielded end can be terminated to the middle pin on the connector Termination Each end of the segment must be terminated in the characteristic impedance of the cable A 120 ohm resistor can be invoked with a jumper which resides on the EIA 485 daughterboard adjacent to the port connector With the middle jumper inserted at location 1 on the daughterboard 120 ohms of resistance is applied across the twisted pair With the jumper removed no termination is applied If itis desired to apply external termination instead remove this jumper an
32. without obligation of Contemporary Control Systems Inc to notify any person of such revision or change TD675100 OMJ i Contents Chapter 1 Introduction 1 1 1 Description 1 917 T li E E E E A 2 1 3 Specifications 3 1 4 Ordering Information 5 Chapter 2 68 7 uuu I 2 2 Electromagnetic Compliance 7 229 the Al 8 24 Powering the Al 8 De 11 2 6 Connecting Cables to the Al 12 2 7 Variable Data Rates 21 2 8 Supporting Extended Timeouts 22 25 3 1 Theory of Operation 25 3A u uu u u u uuu u 26 33 Isolating Faulty Nodes with Line Activity Indicators 28 SBoryIC06 xu uuu usus 29 29 Technical SUP uu k u u uuu 30 Warranty 30 Nome Warranty Repalr 31 Returning Products for Repalr 31 Appendices Appendix A Permissible Segment Lengths 22 Appendix B Declaration of Conformity 35 TD6
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