8520/8520R
Contents
1. 10 bit Two extra checksum bytes can be enabled or disabled Built in transient voltage suppresser and PTC protector ASCII command response protocol Plug in screw terminal block Power 10V 30V DC Power reverse protection over voltage brown out protection System Internal Dual watchdog power on start value and safe value for host failure Operating temperature 10 to 70 C 14 to 185 F Storage temperature 25 to 80 C 13 to 185 F Humidity 5 to 95 non condensing Isolation voltage 3000 VDC 8520 8520R Manual 4 1 3 8000 System Network Configuration Multiple Baud Rate amp Multiple Data Format Host PC RS 485 Network RS 485 type PLC f 0 _ 4 8000 Series A modules iv RS 485 Network i i RS 485 Network KI J ees Baud Rate 19200 UY All Ka Data 10 bit 8520 Wireless Moden E Ar RS 485 Network f a Er i Wireless Modem Baud Rate 115200 Data 10 bit 8000 Series Baud Rate 19200 Data 10 bit 8520 RS 232 to RS 485 converter 8510 RS 485 repeater iL ae c gt Wireless modem 8000 Series A D D A DIO modules Figure 1 3 1 8000 Series Remote Data Acquisition and Signal Conditioning Network 8520 8520R Manual 5 Disadvantages of Conventional Two Wire RS 485 Networks In a standard RS 485 network a converter is used to adapt the host PC s single wire RS 232 signal to the two wire RS 485 s2. which permits using a single host PC and a single communication line for up to 2 048 different devices greatly reduces system cost and increases system reliability Operation Principle Refer to Figure 1 3 1 1 The Host PC sends out a command via COM1 2 The 8520 converts the RS 232 signal into a RS 485 signal 3 All modules connected to the RS 485 network will simultaneously receive this command Each module in the network will extract the destination address field and compare this value to its local module address 4 The module to which the command was addressed will execute it and the other modules will ignore the command 5 After executing the command the addressed module sends a response back to the host PC over the RS 485 network 6 The 8520 module processes the response and converts it from RS 485 to RS 232 for use by the Host PC 7 Host PC will interpret this result and take appropriate action 8520 8520R Manual 6 8510 Isolated Repeater The 8510 repeater module is used to expand a standard RS 485 network A single 8520 is capable of supporting a 256 module network over 4 000 feet Each 8510 module can be used to extend the network by another 256 modules or another 4 000 feet As a single 8520 can support eight 8510 repeaters up to 2 048 individual modules can be connected in a single network The 8510 repeater can also be used to partition a long RS 485 path into several shorter isolated paths for safety cons
3. 2 2W Max 8520 8520R Manual 12 2 3 Block Diagram Isolation 3000Vdc D D V Isolation in ah RS 232 site Figure 2 3 1 8520 block diagram Tsolation 3000Vdc Self tuner Isolation in RS 485 site Figure 2 3 2 8520R block diagram 8520 8520R Manual 13 2 4 Basic Wire Connection RS 485 wire connections GND Ext Power GND VS 43 Ext Power 10 30V Data Data Data gt Data RS 232 wire connections Host RXD gt 8520_pin2 Host TXD 7 8520 pin3 Host GND 8520_pin5 Host Computer Com 1 2 3 4 or UART port Data Female 9 pin D sub El Data External power 8510 8520 RS 485 repeater RS 232 to RS 485 idea 3000V isolati RS 485 RS 232 _ e sorat RS 485 Connecting 256 gt Y Man gt modules without E 4 repeater 8000 O 8510 series modules 8520 8520R Manual 14 y 8000 series modules 2 5 Choosing between 8520 and 8520R 8520R is exactly the same as 8520 except for the isolation site The isolation site of the 8520 is located in the RS 232 interface circuit but the isolation site of the 8520R is located in the RS 485 interface circuit The power input and RS 485 interface is in common ground with 8520 but the power input and RS 232 interface is in common ground with 8520R This is summarized in the table below gt es 8520R RS 485 site Common ground
4. to function properly However if the network extends over 328 feet terminal resistors may be required at both ends of the RS 485 segment Calculating the value of the terminal resistor can be complicated and the best method to use is trial and error First use a scope to obtain the RS 485 signal reading If the impedance match of RS 485 network is OK the scope will illustrate a perfect square wave If the squared wave is distorted two terminal resistors should be inserted at both ends of the RS 485 segment See Figure 3 1 3 nome Pipe PE gee Terminator resistor Terminator resistor value is Of value is too small too large Figure 3 1 3 Scope readings for RS 485 signals To select the appropriate terminator resistor try the following 1 Ifthe length of the RS 485 is approximately 4000 feet begin with a 110Q resistor If the length of the RS 485 is approximately 1970 feet begin with a 220Q resistor If the length of the RS 485 is approximately 980 feet begin with a 3300 resistor 2 Use 8000Util to select the module and run communication for an eight hour period 3 If 8000Util returns numerous communication errors use a scope to check the waveform Depending on whether the scope shows that the terminal resistor is too small or too large see figure 3 1 2 above change the resistor and perform another 8 hour test 4 When the appropriate resistor values are determined run the communication test for one more uninterrup
5. 8520 8920 User Manual Warranty All products manufactured by SuperLogics are warranted against defective materials for a period of one year from the date of delivery to the original purchaser Disclaimer SuperLogics assumes no liability for damages consequent to the use of this product SuperLogics reserves the right to change this manual at any time without notice The information furnished by SuperLogics is believed to be accurate and reliable However no responsibility is assumed by SuperLogics for its use nor for any infringement of patents or other rights of third parties resulting from its use Copyright Copyright 1999 by SuperLogics All rights reserved Trademarks Trademarks and tradenames used herein are the property of their respective owners License This software may be used modified or backed up on a single machine The software or any copy of 1t may not be reproduced transferred or distributed in whole or in part 8520 8520R Manual 1 Table of Contents Chapter 1 Introduction 1 1 8000 Series Overview ooccccccnnonononnnenccnnnnnnononononccnononnnnononnnancnnonnnno nono ia dea 3 1 2 8000 Series Common Features oooocococococoooononononononononononononononononononononononannnononenonanenanonon 4 1 3 8000 System Network Configuration cccoconononononcconnnonononononancnnononnononononccnononannannnnncncnns 5 1 4 8000 Series Module DimensIoOnS ooococccconononononononononononononononononono
6. Common ground RS 232 site Applications Most applications For RS 232 type PLC networking 8520 RS 232 to RS 485 3000V isolation e Connecting 256 modules without repeater 8510 4 8000 8000 Series modules Series Modules Figure 2 5 1 8520 Application 8520R 8520R 1 24vDC 24vpc from PLC from PLC Connecting 256 PLCs without gt repeater 8510 gt RS 232 type PLC RS 232 type PLC Figure 2 5 2 8520R application 8520 8520R Manual 15 8520 Note The 8000 Series modules and the RS 485 line Host PC PLC sie J share a common ground 8000 series modules Figure 2 5 3 8000 Series Network with 8520 module In most applications the 8520 is used to convert the RS 232 signal from the host PC for the RS 485 network and vice versa A system of this sort is depicted in Figure 2 5 3 Normally the 8520 does not use the same DC power ground as the Host PC PLC and the isolation site is at the RS 232 site isolating the Host PC PLC from the RS 485 network With this configuration any high voltage transients on the RS 485 network would not effect the host PC PLC WARNING ERROR CONDITION 1 Referring to Figure 2 5 3 above if the 8520 is replaced by the 8520R and the 8520R uses the same DC power ground as do the 8000 modules the following conditions are present 1 The Host PC PLC is in common ground with the RS 232 site 2 The RS 232 site is in common ground with 8520R power ground 3
7. RS 485 signals from the network which is made up of multiple 8000 Series modules serial input devices PLCs or other PCs into RS 232 for the host computer while retaining the data format appripriate for each device This feature which permits accommodating so many different types of device on a single network makes the 8000 Series an extremely cost efficient choice Dual WatchDog The 8000 series is designed for harsh environments and industrial applications In such environments there is bound to be a problem with noise and transient energy If there is a very large amount of interference it may cause problems in the 8000 modules The watchdog timers are constantly monitoring the system to make sure that everything is functioning within acceptable parameters The module hardware watchdog concerns itself with the individual modules and if a problem is detected it can reset a single module without altering the entire network The host software watchdog is responsible for the whole system and will reset the entire network if problems are encountered When a problem is encountered in a single module it will revert to its predefined start value If there is a network problem all modules will revert to safe states If the host PC is down all modules revert to their predefined safe states as a safety protection This dual watchdog system greatly increases system reliability and greatly reduces the potential damage which could result from a sy
8. The 8520R power ground is in common ground with the 8000 Series modules power ground 4 The 8000 Series modules share a common ground with the 8520R In this situation the Host PC PLC shares a common ground with the RS 485 network and there is no isolation between the Host PC PLC and the RS 485 network As the result the Host PC PLC may be damaged if there are any high voltage transients on the RS 485 network 8520 8520R Manual 16 WARNING ERROR CONDITION 2 If the 8520 has the same DC power ground as the Host PC PLC For example the host PC PLC provides a non isolated DC power source to the 8520 then the following conditions would be present 1 The Host PC PLC is in common ground with the 8520 power ground 2 The 8520 power ground is in common ground with the RS 485 network In the above configuration the Host PC PLC shares a common ground with the RS 485 network and there is no isolation between the Host PC PLC and the RS 485 network Therefore the any high voltage transients on the RS 485 network may damage the Host PC PLC Proper Configuration To ensure that the Host PC PCL is completely isolated from the RS 485 network make sure that the 8520 8520R DC power ground does not share a common ground with any other module in the network The PWR 24 24V DC power adapter can be used to provide isolated power to the 8520 However it is designed for use with a single module only The 24V DC output of the PWR 24 is i
9. iderations See the 8510 manual for more information on this module Supporting Multiple Baud Rates As noted earlier 8000 Series networks support devices operating at different baud rates For example in Figure 1 3 1 the diagram depicts a wireless modem operating at 19200 bps 8000 Series modules operating at 115 200 bps and a PLC operating at 9600 bps The 8520 converter module can automatically switch to any baud rate in the 1200 bps to 115 200 bps range When the host PC sends commands it tailors them to the baud rate at which the target module is operating Any module set for a different baud rate will ignore the command each module at the target baud rate will determine whether the command is addressed to it see step 3 in section 1 2 above and react appropriately Supporting Multiple Data Formats As noted earlier a SuperLogics 8000 Series Network can support multiple devices using different data formats because of the Self Tuner ASIC on the 8520 module For instance a standard RS 232 serial signal takes the form of START bit DATA bit PARITY bit STOP bit 8000 Series modules uses a 10 bit data format as follows 1 START bit 8 DATA bit no PARITY bit 1 STOP bit A standard PLC uses an 11 bit data format as follows 1 START 7 DATA 1 PARITY 2 STOP The Host PC can send and receive data in multiple formats so the only restrictions are due to limitations of the serial network delivering the data The 8520 module translates
10. ignal required by the network However when using a standard converter not only must the baud rate and data format for all signals remain fixed but they must be identical for all incoming signals This can pose a problem if multiple types of devices are to be used in a single system such as a module operating at 115200 bps with a 10 bit per channel data format and a standard PLC operating at 9600 bps with an 11 bit data format One solution to this problem is to use two independent two wire RS 485 networks to accommodate both devices However this can increase overall system cost and decrease system reliability If devices are capable of operating at different baud rates but share a single data format a single standard two wire RS 485 network can be used provided that all devices are set to use the lowest common baud rate While this solution may save on system cost it is at the expense of performance The 8000 Series Network Advantage The 8000 Series is a powerful two wire RS 485 network which provides the flexibility of linking devices with multiple baud rates and data formats in a single system The 8520 RS 232 to RS 485 converter is equipped with a patent pending Self Tuner ASIC which can auto tune the baud rates and data formats for an entire RS 485 network It can also handle the direction of the RS 485 communication line This is all done automatically without the inconvenience of manually setting DIP switches This unique feature
11. ion normally and if a high energy transient occurs on the network the Host can be severely and unexpectedly damaged 8520 8520R Manual 19 8000 RS 485 Networking 3 1 Standard and Isolation Configurations 8520 isolated 232 485 510 isolated 485 repeater 8xxx modules in one RS 485 A B lt 256 A C lt 2 048 Figure 3 1 1 Standard Network Configuraiton In a standard network configuration as shown in Figure 3 1 1 above the Host PC sends command strings from its RS 232 port The 8520 module converts the RS 232 signal into RS 485 and isolates the Host from the RS 485 network The 8000 series data acquisition and signal conditioning modules are directly connected to the RS 485 network A maximum of 256 8000 modules can be connected in the RS 485 network using a single 8520 module To extend the network a 8510 module is needed Each 8510 repeater can add another 256 modules to the network Using the 8510 repeaters the 8520 can accommodate up to 2 048 modules and can be configured in a single RS 485 network Though it is possible to configure up to 2 048 modules in a network because of addressing constraints all modules can not operate at the same baud rate Valid module addresses range from 00 to FF therefore the maximum number of modules in a network communicating at a single baud rate is 256 from 00 to FF The modules can share addresses if the modules are operating at different baud rates Thus address FF can be assig
12. ither the 8520 or 8520R can be used as the converter module for this system Similarly the additional converter modules used in the network can be either the 8520 or 8520R The system illustrated in Figure 3 2 1 uses a 8520 module to make the connection to the host PC and three 8520R modules to connect with the three PLCs Because the PLCs are providing DC power to the three converter modules it is important that 8520R modules be used to maintain 3000V high isolation See section 2 5 for more information about module isolation 8520 8520R Manual 23 3 3 PC Networking Applications puras 8000 series I T T Host PC 8520 RS 232 Remote PC Remote PC Connecting 256 remote PC max without repeater 8510 Figure 3 3 1 8000 Series Network incorporating remote PCs Every remote PC in a network has a unique address known as a slave PC address Similar to the module address of the 8000 series the slave PC address is unlimited Any number of remote PCs can be connected in a single RS 485 network environment by using the 8510 repeater The host PC sends out a command to the remote PC using the same method it uses to send commands to 8000 Series modules When the remote PC receives a command it first determines whether the command was addressed to it if it is the command is executed if it is not the command is ignored 8520 8520R Manual 24 3 4 RS 232 Device Network pra 7 8000 series Pa
13. l RS 485 Host PC 520 E N Ai m A 8520 1 E 8520 E PWR 24 PWR 24 RS 232 RS 232 device Connecting 256 RS 232 devices max without repeater 8510 RS 232 device Llor RS 232 Figure 3 3 1 8000 network incorporating multiple RS 232 devices RS 232 devices can be easily connected to a 8000 Series RS 485 network in the same manner as the PC or PLC connenction These RS 232 devices must follow the rules below Rule 1 The RS 232 device can not send out a RS 232 signal in the normal condition Rule 2 Every device must have a unique device address Rule 3 The RS 232 device does not send out a RS 232 signal if the destination address does not match with the device address In order to connect RS 232 devices to the network a 8520 R module must be used to convert the RS 232 signal to RS 485 and vice versa For more information on the necessary software programming for RS 232 serial devices refer to 8000 software manuals 8520 8520R Manual 25
14. n for remote signal monitoring and control 1 1 Available 8000 Series Modules The 8000 Series is comprise of the following modules Bus Conversion and Repeater Modules 8520 RS 232 to RS 485 converter 8520R RS 232 to RS 485 converter with 3000V isolation 8510 RS 485 to RS 485 repeater with 3000V isolation Digital I O Modules 8050 7 digital input channels 8 TTL compatible digital output channels 8052 8 isolated digital input channels 8060 4 isolated digital input channels 4 digital relay outputs Analog Output Modules 8021 Single channel analog current or voltage output Analog Input Modules 8013D Single channel RTD analog input 8014D 1 channel analog input 1 channel digital input 2 channels digital output with LED display 8017 8 channel analog input module 8018 8 channel thermocouple input module Timer Counter Modules 8080D 2 independent 32 bit counters 2 digital output channels 5Hz to 50Hz frequency measurement range 8520 8520R Manual 3 1 2 8000 Series Common Features Communication Asynchronous half duplex 2 wire RS 485 network Maximum network distance without repeater 4000 feet 1 2Km Baud Rates 1200 2400 4800 9600 19200 38400 57600 115200 bps Up to 256 modules per 8520 converter or 2 048 modules in a network using 8510 repeaters A single network can accommodate multiple devices with different baud rates and data formats 8000 series data format 1 start 8 data 1 stop no parity
15. ned to eight modules in a network one for each of the eight baud rates 1 2 kbps 2 4 kbps 4 8 kbps 9 6 kbps 19 2 kbps 38 4 kbps 57 6 kbps 115 2 kbps supported by the 8000 Series This is only possible because of the unique Self Tuner ASIC found on the 8520 and 8510 modules which allows them to process signals at multiple data rates in a single system 8520 8520R Manual 20 Use the search function in the 8000Util program to locate the modules installed in the network and determine their baud rate and address See the 8000Util manual for more information All 8000 Series modules in an RS 485 network share a common ground However since this network can be up to 4000 feet long 1t is highly susceptible to coupled noise If transient energy causes too much noise the entire network may be damaged The 8510 module can be used to break a network up into smaller isolated segments This way if a portion of the line is damaged it will not effect the entire system Figure 3 1 2 Isolated 8000 Network Configuration Preferred For example in Figure 3 1 2 above the three 8510 modules are used to isolate local modules from the main RS 485 network By creating several short RS 485 network paths with the repeaters protects all the modules from being damaged due to any high energy transients on the RS 485 network 8520 8520R Manual 21 If the RS 485 network is under 328 feet terminal resistors are not necessary in order for the system
16. nononononononononanoninonos 8 Chapter 2 8520 8520R Specifications QA Pin Assignments A O 11 IS A A EN 12 2 3 Block DIAM a II EAS Ce iaa ee eee eee 13 2A Basic Wire Connections iii AAA A A TA AAA AA 14 2 5 Choosing between the 8520 and 8520R cccccecccccecececececececeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeess 15 Chapter3 8000 RS 485 Networks 3 1 Standard amp Isolation CONTIBUTAtiONS cocococooococoncconnnnnononononanccnonnnnonnnnnonccnonnnnnnnnnnnnccccnnnnne nos 19 3 2 PLC Networking Applications 2 0 0 0 eeeeeesscsecececeeessesseaececececesseseaeaeeeeeeeseeseensaeeeeeeeeeeeeseaas 22 3 3 PC Networking Applications csi a ed eee 23 3 4 Using RS 232 Devices in a 8000 Network ceececcccceceseesessnnececececeseesesceeeeeeceseeseneaaeeeeeers 24 8520 8520R Manual 2 Introduction The 8000 Series of modules is comprised of analog and digital O modules designed for a wide variety of data acquisition and signal conditioning functions These modules are designed for an RS 485 communication network and require an RS 485 to RS 232 converter in order to be accessed through a standard PC serial port The 8520 8520R module performs this function Unlike many other converters the versatile 8520 contains a unique self tuner AISC that allows it to process signals from multiple serial devices operating at different baud rates and using different data formats This flexibility makes a 8000 Series network an extremely cost effective solutio
17. solated from its AC input Thus if 8520 8520R is connected to the PWR 24 then the PWR 24 can not connect to any other module Normally the Host PC PLC uses switching power The DC output of this switching power supply is also isolated from its AC input Therefore since the Host and the 8520 8520R modules are using separate DC power grounds the Host PC PLC is completely isolated form the RS 485 network PWR 24 RS 485 Connecting 256 F modules without repeater 8510 Sree sens O 8000 series Figure 2 5 4 Host PC PLC and 8520 8520R use different DC power grounds thus the Host is LLE LL O ee 8520 8520R Manual 17 8520 8520R Manual 18 The 8520R is designed for PLC networking and may share a 24 VDC power source with the PLC system see configuration A in Figure 2 5 5 below If the 8520 module is used with the PLC system and additional power source PWR 24 is required see configuration B in Figure 2 5 5 below RS 485 AL 8 8520R ave 8520 e T from PLC PWR 24 RS 232 type PLC eS RS 232 type PLC Configuration A Configuration B Figure 2 5 5 8000 Series containing a RS 232 type PLC 8520R vs 8520 Maintaining isolation between the Host PC PLC and the 8000 RS 485 network is very important to ensuring system stability Be certain to select the appropriate converter module for the network 8520 or 8520R Even if the network is incorrectly grounded the modules will continue to funct
18. stem failure 8520 8520R Manual 7 1 4 8000 Series Module Dimensions 2 screw M3 18 mm 25 mm SIDE VIEW 5 mm REAR VIEW TOP VIEW 8520 8520R Manual 8 142 mm Plastic Part for Panel Mount 8520 8520R Manual 10 B mmi 8520 8520R Specifications 2 1 Pin Assignments Figure 2 1 1 8520 8520R pin assignments 8520 8520R Manual 11 2 2 Specifications 8520 RS 232 to RS 485 Converter with isolation at RS 232 site Protocol two wire RS 485 differential D D Connector plug in screw terminal block Speed Internal Self Tuner automatic switching baud rate from 1200 to 115200 BPS Modules in Network 256 modules max in one RS 485 network without repeater 2048 modules max in one RS 485 network with repeater Isolation voltage 3000V Isolation site RS 232 Repeater request 4 000 feet or over 256 modules Power requirements 10V to 30VDC Power consumption 2 2W Max 8520R RS 232 to RS 485 Converter with Isolation at RS 485 site Protocol two wire RS 485 D D Connector plug in screw terminal block Speed Internal Self Tuner automatic switching baud rate from 1200 to 115200 BPS Modules in Network 256 modules max in one RS 485 network without repeater 2048 modules max in one RS 485 network with repeater Isolation voltage 3000V Isolation site RS 485 Repeater request 4 000 feet or over 256 modules Power requirements 10V to 30VDC Power consumption
19. ted eight hour stretch S 8000U 11 will COMmMUOUSlY Perform send and receive testing Wien tc E results are recorded This function is particularly useful for evaluating a network s stability If the system can run for eight hours with no errors it can be assumed that the system is stable and the correct terminal resistor has been selected NOTE 1 The value of terminal resistor depends upon the type of RS 485 wire used If the RS 485 path is long a high quality wire is preferable NOTE 2 The terminal resistor varies from application to application Therefore the 8520 and 8510 are not equipped with terminal resistors The user must select and provide the terminal resistors Carbon 1 4W resistor terminators are recommended 8520 8520R Manual 22 3 2 PLC Networking Applications PLC 1 address 1 address n address m Figure 3 2 1 PLC Networking Application The 8000 Series can operate in an RS 485 network with multiple PLCs which use different baud rates and different data formats For example in Figure 3 2 1 the three PLCs in the system are configured as follows PLC 1 1 start 7 data 1 stop 9 bit word baud rate 1200 PLC n 1 start 8 data 1 parity 1 stop 11 bit word baud rate 9600 PLC m 1 start 8 data 1 parity 2 stop 12 bit word baud rate 115200 OMRON CQM1 1 start 7 data 1 even parity 2 stop 11 bit word OMRON C200 1 start 7 data 1 even parity 2 stop 11 bit word E
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