PCL-725 Relay Actuator and Isolated D/I Card USER`S MANUAL
Contents
1. 7 2 4 Tumpers eec aae Soie e ERES 7 2 5 Installing The PCL 7253 i oigo RS RR 8 CHAPTER3 DIGITAL I O PROGRAMMING 11 CHAPTER 4 CUSTOMIZE THE CURRENT LIMIT RESISTOR 13 CHAPTERS RELAY OUTPUT 15 5 1 Using the ContactProtection 16 AppendixA I Oport Address 19 CHAPTER 1 INTRODUCTION 1 1 General Description The most common method of interfacing a microcomputer system such as the PC is through the use of programmable digital input and output registers With digital output registers the computer can write data into the registers treating the register as an I O port The output of these registers can then be wired to an interface device such as a relay Thus by writing data to an output register it would be possible to activate and deactivate a relay The relay could in turn control for example the power to a motor Digital input registers are similar but are used to sample the status of signals attached to their inputs For example if a program wants to determine if a switch is open or closed the switch can be tied to the input of a digital input register A digital input register can be thought of as an I O port that has wires attached to individual bit locations When read the data results reflect the state of the signals on the wires Designed with this idea in mind the2. Riim current limlit resistor Note It is suggested that the Iin is within 20 mA Additionally you should consider the current limit resistor s maximum power rating The maximum power consumption should not exceed the power rating of your resistor The approximate formula is shown as below Pin Vin Iin where Iin input current Vin input voltage Pin input power For example if your maximum voltage input is 50V and the current limit resistor you choosed is 1K Ohm then the maximum current input becomes 50mA The power consumption of the current linmit resistor is approximately 2 5 Watts In such situation the power rating of your resistor should be more than 2 5 Watts 4 CURRENT LIMIT RESISTOR VOLTAGE signal TNPUT eS 0 24vDC CHAPTER 5 RELAY OUTPUT After power on the initial relay output status of the PCL 725 is shown as below NORMAL OPEN NO 0 gt NORMAL CLOSED NC 0 i H g COMMON COM 0 NENAS CHANNEL 0 CONTACT PROTECTION ATTON R LOADS 12Y OR CURRENT gt 65mA CONTACT PROTECTION MAY BE REQUIRED Fig 5 1 A write operation to I O address BASE O will change the output status of each relay For example if Bit 0 of BASE 0 is set as 1 logic high relay 0 will switch from position NORMAL CLOSE NCO to position NORMAL OPEN This means that load2 will be de energized while loadl is energized To summarize the CO
3. A D s and D A s PCL 725 Introduction Specifications Isolated Digital Input Opto isolator Input channels Input current Input voltage Input impedance Threshold voltage Input mode Withstanding voltage Non isolated Digital Input Logic level 0 Logic level I Relay Output Relay Type Contact rating Breakdown voltage Operating time Release time Insulation resistance Life expectancy Power consumption Power supply 4N25 8 60 MA max for isolated input Input buffered by voltage comparator 5 24VDC 560 Ohm W 1 5 VDC adjustable by changing voltage dividing resistors isolated or non isolated 1500 VDC 0 0 8 V 2 0 5 25 V 4 SPDT Form C 4 SPST Form A 120 V AC DC IA 1000 V AC DC minimum 8 msec maximum including Bounce 8 msec maximum 100 MOhm minimum gt 10 million operations at full load 12V 33 mA for each relay total 0 264A if ail relays are energized 5V less than 0 2A 12V from the PC bus PCL 725 Introduction General Dimensions 5 3 4 x 3 3 4 14 7 cm x 9 5 cm Bus IBM PC bus Slot One 62 pin slot I O port Address Hex 200 hex 3F8 CHAPTER 2 INSTALLATION 2 1 Initial Inspection Inside the shipping container you should find this operating manual and the PCL 725 card The PCL 725 was carefully inspected both mechanically and electrically before shipment It should be free of marks and scratches and in perfect elec
4. B7 Examples are given here to illustrate how to configure the channel D I channel 1 is configured as isolated first then non isolated PCL 725 Installation Isolated Non isolated Jal p e 1 o_o I N N e e o I o o N o o N To configure channel 1 as isolated the jumper plugs are installed on the upper posts of JA1 and JB1 Otherwise jumper plugs should be installed on the lower posts to configure channel 1 as non isolated 2 5 Installing The PCL 725 POWER MUST ALWAYS BE SWITCHED OFF when removing or inserting the PCL 725 card and connecting or disconnecting cables Use a screw driver to remove the cover mounting screws from the rear of the system unit Slide the system unit s cover away from the rear and to the front When the cover will go no further tilt it up remove it from the base and set it aside The PCL 725 is configured at the factory for the IBM PC PC XT PC AT and all IBM PC compatibles If you need further changes to the configuration please refer to Chapter 2 Installation Use a screw driver to remove the screw that secures the expansion slot cover Save the screw for installation of the interface card The 37 pin connector should be pressed through the rear panel first then press the card carefully into the main board expansion slot Secure the PCL 725 with the 3 16 mounting screw then attach an appropriate PCL 725 Installation cable to the conne
5. L 725 Installation I O port switch position address 1 2 3 4 5 6 7 8 7 A6 5 A4 A3 A2 Al 200 201 0 0 0 0 0 0 0 0 2A8 2A9 0 1 0 1 0 1 0 0 2E8 2E9 0 1 1 T 0 1 0 0 2F8 2F9 0 1 1 1 1 0 0 3E8 3E9 1 1 1 1 0 1 0 0 3FE 3FF 1 1 1 1 1 1 1 1 2 3 Connector Pin Assignments The PCL 725 card is equipped with a 37 pin D type connector accessible from the rear plate Please refer to Figure 2 1 for the location of the connector The following diagram below shows its pin assignments Legend DInL digital input low channeln DInH digital input high channel n GND ground NCn normal close pin of relay n NOn normal open pin of relay n COM n common pin of relay n PCL 725 Installation NO 0 COM NC NO COM NC NO COM NC NO COM DIOH DI1H DIZH DI3H DI4H DI5H DI6H DI7H 2 4 Jumpers There are two jumpers associated with each digital input channel for configuring the channel as either isolated or non isolated 4 C IN 10 2 ae 14 SLS poke el 18 438 n NO COM NC NO COM NO COM NO COM GND DIOL DITI DI2L DI3L DI4L DI5L DI6L DI7L BB WW CO The following show channels and their corresponding jumpers D I channel Jumpers JAO JBO JA1 JA2 JB2 JA3 JB3 JA4 JB4 JAS JB5 JA6 JB6 JA7 J
6. MICROFARADS To determine C the load current value is found on the CURRENT axis Reading directly up to the sloping capacitance line the C value determined from the right hand CAPACITANCE scale To determine R read directly up from the load current value to Its intersection with the appropriate load voltage line The valus of Ris then read from the left hand RESISTANCE acate For ac toads peak current and voltage values must be used Figure 5 3 Appendix A I O Port Address I O address Uses range Hex 000 1FF Used by base system board 200 Not used 201 Game control 202 277 Not used 278 27F Second printer port 280 2F7 Not used 2F8 2FF COM2 300 377 Not used 378 37F Printer port 380 3AF Not used 3B0 3BF Monochrome and printer 3C0 3CF Not used 3D0 3DF Color amp graphics 3E0 3EF Not used 3F0 3F7 5 1 4 inch diskette drive 3F8 3FF COM1
7. MMON line connected to the NORMAL CLOSED line if the corresponding bit is set as 0 power on initial status Otherwise if the corresponding bit is set as i then the COMMON line will connect to the NORMAL OPEN line Warning External circuits connected to the PCL 725 s relay output port must be fused at 1A or less and be rated at 120VA or less Voltage must not exceed 120V peak For maximum relay contact life and to prevent RFI if arcing occurs contact protection is required for inductive loads greater than 12 V 64mA For more information please refer to section 5 1 PCL 725 Relay Output 5 1 Using the Contact Protection Nomograph Loads which may cause relay contact arcing may also cause contact failure unless contact protection is provided The nomograph provided in Figure 5 3 provides suitable guidelines for R C network design for most loads For PCL 725 you should provide relay contact protection if the load to be switched is greater than 12 V 65 mA Figure 5 2 illustrates an example of a relay contact protection network For instance if the load to be switched is 50 V 300 mA then 56 ohms and C 0 009 uF remember that for PCL 725 s relay output E 120 V maximum The R C network should be mounted as close to the relay contacts as possible NOTE The nomograph indicates that for 70 lt E lt 100 V can be 50 of the nominal chart value NORM NORM TE PEN CLOSED LOAD z
8. PCL 725 Relay Actuator and Isolated Card USER S MANUAL COPYRIGHT NOTICE This documentation is copyrighted 1995 by Advantech Co Ltd All rights are reserved Advantech Co Ltd Reserves the right to make improvements in the products described in this manual at any time without notice No part of this manual may be reproduced copied translated or transmitted in any form or by any means without the prior written permission of Advantech Co Ltd Information provided in this manual is intended to be accurate and reliable However Advantech Co Ltd assumes no responsibility for its use nor for any infringements of the rights of third parties which may result from its use ACKNOWLEDGEMENTS PC LabCard is a trademark of Advantech Co Ltd IBM and PC are trademarks of International Business Machines Corporation MS DOS is a trademark of Microsoft Corporation BASIC is a trademark of Dartmouth College Inter is a trademark of Intel Corporation Part No 2003072500 4th Edition Printed in Taiwan Sept 1995 TABLE OF CONTENTS CHAPTER 1 INTRODUCTION eese eee 1 1 1 General Description 00 00 cece eee eee eee 1 1 2 Features Application and Specifications 2 CHAPTER2 INSTALLATION esee ee eee 5 2 1 Initial Inspections ie itane na aa III 5 2 2 Base Address 5 5 2 3 ConnectorPin 1
9. PCL 725 Relay Actuator amp Isolated D I card is an IBM PC add on card that offers you 8 relay actuators and 8 opto isolated digital inputs on a single board Typically the 8 on board relays can serve as ON OFF control devices or small power switches The 8 opto isolated D I channels are ideal devices for collecting digital inputs under noisy environment or floating potential Also the 8 isolated inputs provide the best method to prevent the ground loop problem For easy monitoring each relay is equipped with one red LED to reflect its ON OFF status Each input channel is jumper selectable to either isolated or non isolated input Access to input and output channels is made possible through a on board 37 pin D type connector PCL 725 Introduction 1 2 Features Application and Specifications Features 8 Relay actuator outputs 8 Opto isolated digital inputs LED indicators to show activated relays Jumper selectable isolated non isolated input signals On board relay driver circuits On board input signal conditioning circuits Easy touse andprogram Applications Digital signal sensing Switch contact status sensing Limit switch monitoring BCD interface ndustrial on off control Signal switching Valve solenoid control External high power relay driving Alarm activating Annunciator control ndustrial automation Laboratory automation Useful with
10. ctor Slide the system unit s cover back on Align the system unit tabs with the cover holes and reinstall the 1 4 mounting screws CHAPTER 3 DIGITAL I O PROGRAMMING On the PCL 725 card 8 digital input channels and 8 relay output channels are provided Two I O port addresses started from BASE 0 are reserved for accessing these channels The two addresses are allocated as BASE 0 D O channel 0 7 BASE 1 D I channel 0 7 A read operation on BASE 1 will read in the value 8 bits of the 8 corresponding digital input channels To access these channels in BASIC use the statement VALUE INP BASE 1 A write operation on BASE 0 will set the desired status 1 ON 0 OFF on the 8 corresponding relay output channels To program these channels in BASIC use the following statement OUT BASE XYZ Where XYZ should be a number between 0 and 255 The status of the relay outputs can be monitored by reading back the BASE 0 byte as shown below STATUS INP BASE CHAPTER 4 CUSTOMIZE THE CURRENT LIMIT RESISTOR The default voltage input range of the PCL 725 is from OV to 24V To accept higher voltage input users can replace the current limit resistors RAO through RAT for each channel It is easy to choose the proper current limit resistor Since the 4N25 isolator has a current rating of 60 mA your input current can not exceed 60 mA The formula is shown as below I where I input current Vin input voltage
11. oan 9 bii w R EA R i Q po p Cee T Figure 5 2 PCL 725 Relay Output CONTACT PROTECTION Contact loads that can cause arcing may result in contact failure unless contact protection is provided It should be wired close to the relay terminals The R C network shown is suitable for most loads Component values may be obtained from the nomograph Capacitance may be increased up to 10 times to minimize inductive load transients Use peak values for ac circuits HOW 10 USE THE NOMOGRAPR RESISTANCE OHMS Im wv No protection is required for voltages below 12 volts or currents below 65ma The resistor may be eliminated for voltages below 50 volts with currents below 0 5A The capacitor should not exceed the chart value Highly capacitize loads do not require protection isi n NN IY NS ANY HON N CONTACT PROTECTION NETWORK E SOURCE VOLTAGE IMMEDIATELY PROR TOCOHT CLOSURE 10 lt E lt 100 BE S0 MO lt E lt 150 RMAY BE 10 E gt 150 RuaY Bes See Auman Q5 OFM 00 MFO TT MSIE TEST DIU os soso osi 3 30 4030 CURRENT AMPERES IMMEDIATELY PRIOR TO CONTACT OPENING 98333 8 3 3 5885855 i CAPACITANCE
12. trical order on receipt Remove the PCL 725 interface card from its protective packaging by grasping the metal rear panel Keep the anti vibration package since it may be used to return the card if it needs repair The package may also be used if the card is stored outside of the computer The board should be handled only by the edges The integrated circuits on the board can be damaged by static electric discharge 2 2 Base Address Selection Most of the peripheral devices and the interface adapters in the PC are controlled and sensed using the digital input and output ports These ports are addressed using the I O port address space of the 8088 or 80286 microcomputer The I O port base address for the PCL 725 is selectable by an 8 position DIP switch Valid addresses are from hex 200 to hex 3FE Refer to Figure 2 1 for the location of the DIP switch SW1 PCL 725 Installation JAQ JAY JAZ 1 in M Li ow MB 7654521 mq dhd JAS JA6 it i i Pon Lis Los 1 T i vain s iN PCL 725 REV A2 RELAY ISOLATED D I 1 Figure 2 1 The PCL 725 Card The required switch settings for various base addresses are illustrated as below Note ON 0 OFF 1 X means don t care 1 8 are switch positions A1 A8 correspond to address lines of the PC bus A9 is hard wired to be 1 means factory setting PC
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