1781-PXB 241 manual for 24-point Discrete I/O
Contents
1. 1781 PXB241 User s Manual INTRODUCTION The 1781 PXB241 board provides a direct interface between the personal computer PC and a digital I O rack for single point I O modules The 1781 PXB241 board is plugged into the PC backplane and a 50 pin ribbon cable is connected between the 1781 PXB241 and the I O rack mounting board The 1781 PXB241 monitors and or controls up to 24 individual I O points on a single rack The 1781 PXB241 is a single half slot board that plugs directly into a IBM or IBM compatible personal computer XT or AT bus PC bus The 1781 PXB241 is compatible with the Opto22 AC5 and allows the user to connect any standard 50 pin I O rack to the 1781 PXB241 interface board The connection from the 1781 PXB241 interface to the I O rack is through a 50 pin flat ribbon cable The 1781 PXB241 can be used with Western Reserve Controls line of industrial digital I O modules and mounting boards as well as those from other manufacturers including standard size miniature or new G4 G51 O modules gt Upto 24 digital I O points per 1781 PXB241 gt Compatible with the Opto22 AC5 gt PC XT or AT bus half slot gt Selection of I O address gt Dip switch for I O address gt 5V powertol O mounting rack optionally supplied Western Reserve Controls Inc 1781 PXB241 User s Manual BOARD DIMENSIONS 4 75 gt 1781 PXB241 Address DIP 3456789 Figure 1 Western Reserve Controls2. outp base 4 0xff read the inputs and prints their status status inportp base 4 0xff printf n nThe input status of port C is x status Western Reserve Controls Inc 1781 PXB241 User s Manual APPENDIX A VISUALBASIC UTILITY DRIVER Western Reserve Controls provides extensions to the VisualBASIC language on the diskette provided with your card The extensions are in a directory named VB_WRC These extensions are in the form of a DLL GBL and a VisualBASIC 3 0 sample Together these files allow you to access the port and main memory space in a fashion similar to BASIC QuickBASIC Pascal C C Assembly and most other standard languages To use these files in a VisualBASIC program you must create a MAK file File New Project similar to the sample provided or else modify your existing project file and include the GBL file File Add File Once this has been done VisualBASIC will be enhanced with the addition of the following functions Note that VB_WRC DLL must be in the path stated in the GBL file for any of the following functions to work Release 1 21 of the PXB 241 contains the pxb95 dll file that allows it to be used in a Windows95 and VisualBASIC 5 0 environment This version was written to support 32 bit mode of operation in Windows95 You must replace the references to vb_wre dll with pxb95 dll in the examples shown for VB3 in order to use it with VB5 0 Inportb Function Reads a by
3. Inc 1781 PXB241 User s Manual HARDWARE ADDRESSING The 1781 PXB241 board is mapped into the I O space of the personal computer All communications between the PC and the 1781 PXB241 are done using input INP and output OUTP computer instructions The addresses of the INP and OUTP instructions are determined by setting the DIP switch on the 1781 PXB241 board The base address of the 1781 PXB241 is determined by the DIP switch setting The base address of 1781 PXB241 must be selected prior to installation of the 1781 PXB241 board Below isa description of the DIP switch and jumper settings ON CLOSED 0 OFF OPEN 1 LON 3EOH Default ON JON OFF OFF OFF OFF OFF OFF HARDWARE INSTALLATION 1 Set the address DIP switch to a desired address The address DIP switch is shown in Figure 1 Select a base address for the 1781 PXB241 and set the individual DIP switches to ON or OFF corresponding to the selected base address The base address and switch settings are shown above 2 The 1781 PXB241 can supply 5 volt logic power to the I O mounting board rack via line 49 in the 50 conductor ribbon cable Determine if the power to the I O mounting board is to be supplied from an external power source or from the P1781 PXB241 If power is to be supplied from the computer and PXB241 then make sure the 5 V fuse jumper F1 is installed 3 If the 5 V power for the I O mounting board is to be supplied from an external power source th
4. OUT BASE 1 0 200 OUT BASE 3 0 210 OUT BASE 5 0 250 OUT BASE 0 amp H FF 260 OUT BASE 2 amp HFF 270 OUT BASE 4 amp H 00 200 taiat Si 290 Set up last port as all Inputs IN sd BLO RE ba adu tt 320 Set up the Control Registers Always amp H 34 DBO ae futa ata nai stati thaes 340 OUT BASE 1 amp H 34 350 OUT BASE 3 amp H 34 360 OUT BASE 5 amp H 34 400 OUT BASE 0 amp HFF 410 OUT BASE 2 amp HFF 430 Read the Inputs EN 450 X INP BASE 4 460 PRINT PORT C INPUT STATUS X 470 PRINT BIT 1 gt OFF BIT 0 gt ON 480 Western Reserve Controls Inc 1781 PXB241 User s Manual 490 END 10 Western Reserve Controls Inc 1781 PXB241 User s Manual EXAMPLE C PROGRAM This exampleis for an IBM PC XT AT and a 1781 PXB241 addressed at 3E0H It sets up the first 161 O as outputs and turns them all OFF It sets up the last 81 O as inputs and reads them and prints their status main 11 int base set the base address base 0x3e0 clear the control registers outp base 1 0 outp base 3 0 outp base 5 0 set up first 2 ports as all Outputs 1 output 0 input 3rd port as input outp base 0 0xff outp base 2 0xff outp base 4 0x00 set up the Control Registers Always 0x34 outp base 1 0x34 outp base 3 0x34 outp base 5 0x34 turn all Outputs Off 1 off O on outp base 0 0xff outp base 2 0xff
5. Western Reserve Controls Inc 1781 PXB241 User s Manual 1781 PXB241 User s Manual fac W estern Reserve Controls Inc 16 Western Reserve Controls Inc 1781 PXB241 User s Manual Although every effort has been made to insure the accuracy of this document all information is subject to change without notice Western Reserve Controls Inc assumes no liability for any errors or omissions in this document or for direct indirect incidental or consequential damage resulting from the use of this document Document PUB 19 0 Rev 1 60 January 2000 Copyright 1992 2000 WRC Western Reserve Controls Inc 1485 Exeter Road Akron OH 44306 330 733 6662 Phone 330 733 6663 Fax sales wrcakron com Email http www wrcakron com Web WRC is a trademark of Western Reserve Controls Inc All other trademarks are property of their respective companies 16 Western Reserve Controls Inc 1781 PXB241 User s Manual TABLEOFCONTENTS INTRODUCTION seosesvevenvenverensenverenseneerenseneerenseneeseneenenseneesensenennensenensensenensensenensensenensensenennensensenensensenensensenensenssnensene 1 BOARD DIMENSIONS eereosenverensenverenseneerenseneeseneerenseneesenseneerensenensensenennensenennensenensensenensenensensenensensensenensensenensenssnensene 2 HARDWARE ADDRESSING reosevvevenvenverensenverenserenseneenenseneesensneenensenennensenensenensensenensensenennensnensensenennensensenensenssnennene 3 HARDWARE INSTALLATION
6. byte to each data register A 1 bit in the configuration byte represents an output and a 0 bit represents an input o Output a value of 34 hex to the control register o Now read or write the data register to read or write values to each of the 8 bit I O banks It is important to note that negative logic is used for outputs Writing a 1 bit to an output module will turn the module off and writing a 0 bit will turn the module on o Ll is output OFF o O is output ON The read inputs also use negative logic Reading a 1 means the input is off and reading a 0 means the input is on o T isinput OFF o O isinput ON Western Reserve Controls Inc 1781 PXB241 User s Manual ENVIRONMENTAL SPECIFICATIONS Temperature Oto 60 C Relative Humidity O to 95 non condensing International Agency Approvals CE EMC Electromagnetic Compatibility CABLES AND CONNECTORS 1781 PXB241 is connected to an I O rack via a 50 conductor flat ribbon cable The standard cable available from WRC is 1781 C2EH a cable of 2 feet in length with a header connector at one end and a card edge connector at the other Other cable lengths are available by substituting the 2 with the desired length yielding a catalog number of the form 1781 CxEH To make your own cables use the following cables and connectors or their equivalents Cables AlphaPart 3M Part Tpe 3580 50 or 3365 50 Regular 3583 50 3584 50 or 3353 50 or Gr
7. ed in two s complement form All bit patterns must be converted to and from this two s complement form if meaningful display is required Otherwise values returned from the InPortb function will be 128 to 127 rather than 0 to 255 An alternative is to perform all assignments in hexadecimal rather than decimal form Before the program will execute the GBL file must be modified to include the path to the VB_WRC DLL as appropriate for your system Merely replace the statement VB WRC DLL with drive path VB_WRC DLL As an alternative to changing the source code you can copy the VB_WRC file into your Windows directory This will allow multiple programs to find the same DLL without having to know where it is located Just leave off all references to a path in the GBL file as shown in the sample 13
8. en F1 must be removed Important If an external power supply is used and F1 is not removed from the PXB241 serious damage to the computer and the PXB241 may result 4 With power OFF place the 1781 PXB241 board into an open slot inside your personal computer PC Screw the board down Western Reserve Controls Inc 1781 PXB241 User s Manual 5 Attach one end of a 50 pin ribbon cable to the 50 pin header of the 1781 PXB241 board Attach the opposite end of the 50 pin ribbon cable to the I O rack Be sure to align the pin 1 s of the ribbon cable Most ribbon cables are keyed or have a red line or wire as pin 1 6 Turn on the personal computer 7 If F1 was removed from the PXB241 connect and turn on the power to the l O rack 8 To test the board and I O rack execute the sample basic program listed in this manual 9 If you have problems see the troubleshooting section of this manual The 1781 PXB241 comes with a support diskette As with any software package you should make backup copies for everyday use and place your original master diskette in a safe location To install software on your hard drive do the following 1 Place the software diskette in drive 2 Change DOS prompt to appropriate drive usually A 3 Type INSTALL and follow the screen prompts Files contained on the diskette are stored in separate directories as follows SETUP This directory contains FINDBASE EXE and WRC EXE These DOS programs
9. ereovevvevenvenverensenverenseneesenseneenenseneenensenennenseneenensenennensenensenennensnennensenennensensenensenssnennene 3 SOFTWARE ss baden aa gina da iau a a a daia dei aa ia ana a aia ceai aie ta 4 COMMUNICATING WITH THE BOARD SOFTWARE ADDRESSING s sssssoeoo0o0000000000000080s0s030530530000000 000000 000000 4 INPUT OUTPUT INITIALIZATION eeoeerenvevvevensenverensenverenseneenensenseneenensenennensenensensenennensenennensenensensenensensenensenssnensens 5 ENVIRONMENTAL SPECIFICATIONS sesevvevenvenverenseneerenseneenenseneenenseneenensenennensenensenennensnennensenennensenensensenssnennene 6 CABLES AND CONNECTORS ussssessssssssnssnsnnsnssnsnnsnssnsnnsnssnsnnsnsnsnnsnssnsnsnssnsnnsnssnsnssnsnnsnssnsnssnssnsnnsssssssnsnnsnnsnsnnsnnenn 6 TROUBLESHOOTING eereosevvenvevenvenverenvenverenseneerenseneenenseneenenseneenensenennennenseneesensenensensenennensenennenssnensensenensensenensenssnennene 8 EXAMPLE BASIC PROGRAM ussuesesnennenesnenesnennenesnennenesnennenesnennenesnennenesnennenesnenesnennenesnennenesnennenesnesnennesesnennenesnene 9 EXAMPLE C PROGRAM seerenvenvevenvenverensenverensenserensenserensenserensensersnsenserensenserenserensenserensenserensenserenssnsensesensensensnseneere 11 APPENDIX ensesvevenvenverensenverenseneerenseneerenseneesenseneesenseneerenseneesensenensenseneenensenensenensensenensensenennennensenensensenensensenensensenensene 12 16 Western Reserve Controls Inc Akron Ohio Western Reserve Controls Inc
10. ound Plane 3476 50 3469 50 3589 50 3603 50 Jacketed 3590 50 3517 50 Jacketed and Gnd Plane Western Reserve Controls Inc 1781 PXB241 User s Manual Connectors 3M 3425 7000 Circuit CA Assembly 501 DSB 3M 3415 0001 Western Reserve Controls Inc 1781 PXB241 User s Manual TROUBLESHOOTING The 1781 PXB241 test and configuration software is available in the SETUP and can help you configurethe jumpers on the 1781 PXB241 The 1781 PXB241 software also allows the user to test the individual I O points Usethe TEST program or theVisualBASIC for Windows sample to test I O The following are some helpful hints e Check the 5 volt supply atthel O rack e Check the base address of the 1781 PXB241 board ON closed OFF open e Check that pin 1 of the ribbon goes to pin 1 on the rack e Write a program to turn on off a combination of every other output point The example below was used on an IBM AT with a 1781 PXB241 and a 24 point I O rack with all outputs Western Reserve Controls Inc 1781 PXB241 User s Manual EXAMPLE BASIC PROGRAM I rss 110 This example is for an IBM PC XT AT and a 1781 PXB241 24 Point I O PC 120 Card addressed at 3E0 hex It sets up thefirst 16 1 O as outputs and turns them 130 all OFF It sets up the last 81 O as inputs and reads them and prints the status I rear 150 BA SE amp H 3E0 IV nee 170 Clear the Control Registers 180 ca una poate au tt mi zoo pie 190
11. provide assistance finding an open memory address and setting jumpers on the 1781 PXB241 card TEST This directory contains a basic sample and executable for use with the 1781 PXB241 PXB241 This directory contains basic and C samples as well as a DOS setup program PXB241 exe VB WRC This directory contains a sample VisualBASIC 3 for Windows program as well as a VisualBASIC linkable driver for 16 bit operation see APPENDIX A COMMUNICATING WITH THE BOARD SOFTWARE ADDRESSING The 1781 PXB241 uses a consecutive block of 81 O addresses Each one of these I O addresses corresponds to a control or data register Once the 1781 PXB241 base address is determined this sets the first of 81 O addresses to be used to communicate with each of the 3 sets of 8 bit I O banks I O REGISTER I O BITS ADDRESS Western Reserve Controls Inc 1781 PXB241 User s Manual BASE 0 DATA1 BASE 1 CONTROL 1 BASE 2 DATA2 BASE 3 CONTROL 2 BASE 4 DATA3 BASE 5 CONTROL 3 INPUT OUTPUT INITIALIZATION The 1781 PXB241 uses 6 of the 8 registers for control and data of the individual I O points The 1781 PXB241 must be initialized first prior to its use Each point must be configured as an input or output channel This is accomplished by writing a value to the configuration or control register The following procedure describes the 1781 PXB241 initialization o Output a zero 0 to each control register o Output the configuration
12. te from a hardware port Due to limitations of VisualBASIC the number is returned as an integer Declaration function InPortb byval address as integer as integer InPort Function Reads an integer from a hardware port This function returns the 16 bit value obtained from reading the low byte from address and the high byte from address 1 Declaration function InPort byval address as integer as integer OutPortb Function Writes the lower eight bits of value to the hardware at port address This returns the value output Declaration function OutPortb byval address as integer byval value as integer as integer OutPort 12 Western Reserve Controls Inc 1781 PXB241 User s Manual Function Writes all 16 bits of value to the hardware port at address This function returns the value output Declaration function OutPort byval address as integer byval value as integer as integer Peek Function Reads a byte form main memory DRAM Declaration function Peek byval segment as integer byval offset as integer as integer Poke Function Writes the lower eight bits of value to segment offset Declaration function Poke byval segment as integer byval offset as integer byval value as integer as integer Note that in all the above functions an inherent limitation of BASIC in general and VisualBASIC in particular makes the values sent less intuitive All integers in BASIC are signed numbers wherein data are stor
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