PCI-7250/7251


8 Relay Actuator & Isolated D/I Card

@Copyright 1997

All Rights Reserved.

Manual first edition 7, July 1997

The information in this document is subject to change without prior notice in order to improve reliability, design and function and does not represent a commitment on the part of the manufacturer.

In no event will the manufacturer be liable for direct, indirect, special, incidental, or consequential damages arising out of the use or inability to use the product or documentation, even if advised of the possibility of such damages.

This document contains proprietary information protected by copyright. All rights are reserved. No part of this manual may be reproduced by any mechanical, electronic, or other means in any form without prior written permission of the manufacturer.

Trademarks

PCI-7250/7251 is registered trademarks of ADLink Inc. Other product names mentioned herein are used for identification purposes only and may be trademarks and/or registered trademarks of their respective companies.

Contents

How to Use This Guide

1

Introduction

1.1 Features

The PCI-7250 Relay Actuator and D/I Card provides the following advanced features:

· 32-bit PCI-Bus, Plug and Play
· 8 relay actuator outputs
· 8 opto-isolated digital inputs
· LED indicators to show activated relays

· Jumper selectable AC-filter/non-AC-filter input signals
· On-board relay driving circuits
· On-board digital input signal conditioning circuits

The PCI-7251 can attach to the PCI-7250 card. Each PCI-7251 card provides another 8 relay output and 8 photo isolated input signals. There are at most three PCI-7251 cards can be attached on one PCI-7250 card so that the system can provide 32 relay output signals and 32 photo isolated inputs signals.

1.2 Applications

· Industrial ON/OFF control
· External high power relay driving, Signal switching
· Laboratory automation
· Industrial automation
· Switch contact status sensing, limit switch monitoring,
· Useful with A/D and D/A cards to implement a data acquisition & control system

1.3 Specifications

· Digital input

Input channels	8
Optocoupler	PC-814
Input current	60 mA max. for isolated input
Input Voltage	3 - 24 VDC ( AC 50-1,000Hz)
Input impedance	1.2 K
Threshold Voltage	2.4 VDC , adjustable by changing voltage dividing resistors
Input mode	Isolation AC-filter/ Non-AC-filter
Withstanding voltage	1,000 VDC

· Relay Output

Output Channels	8
Relay Type	8 SPST ( Form C )
Contact rating	120V AC/DC , 0.5 A 24V Vdc, 1A
Breakdown Voltage	1000 V AC/DC min..
Release time	8 msec max.
Operate time	8 msec max..
Insulation Resistance	100M min.
Life Expectancy	> 10 million operations at full load
Power Consumption	+12V , 33 mA for each relay , total 0.264 A if all relay are energized +5V, less than 0.2A
Power supply	+ 12V from the PCI-Bus

· General

Dimensions	5.75" x 3.75" ( 147 mm x 95 mm )
Bus	32-bit PCI bus
I/O port address	Assigned By System BIOS
Temperature	0 ~ 50 C (Operating);
Humidity	0 to 90% non-condensing

2

Installation

This chapter describes how to install the PCI-7250. At first, the contains in the package and unpacking information that you should be careful are described. The jumpers setting for digital input channel configuration (AC-filter or Non-AC-filter) and the signals definitions of the 37-pins connectors are also specified in this chapter.

2.1 What You Have

In addition to this User`s Manual , the package includes the following items:

· PCI-7250 Relay Actuator & Isolated D/I Card
· PCI-7250 Utility and C/C++ Library Diskette

If any of these items is missing or damaged, contact the dealer from whom you purchased the product. Save the shipping materials and carton in case you want to ship or store the product in the future.

2.2 Unpacking

Your PCI-7250 card contains sensitive electronic components that can be easily damaged by static electricity.

The card should be done on a grounded anti-static mat. The operator should be wearing an anti-static wristband, grounded at the same point as the anti-static mat.

Inspect the card module carton for obvious damage. Shipping and handling may cause damage to your module. Be sure there are no shipping and handing damages on the module before processing.

After opening the card module carton, extract the system module and place it only on a grounded anti-static surface component side up.

Again inspect the module for damage. Press down on all the socketed IC's to make sure that they are properly seated. Do this only with the module place on a firm flat surface.

Note : DO NOT APPLY POWER TO THE CARD IF IT HAS BEEN DAMAGED.

You are now ready to install your PCI-7250.

2.3 PCI-7250's Layout

Figure 2.1 PCI-7250 Layout

2.4 Input Signal Setting

There are 8 jumpers (JP1 to JP8) associated with each digital input channel for configuring the channel as AC-Filter or Non-AC-Filter input. Each digital input channel and their corresponding jumper are shown in the following Table 2.1.

JUMPER	INPUT SIGNAL
JP1	DI0
JP2	DI1
JP3	DI2
JP4	DI3
JP5	DI4
JP6	DI5
JP7	DI6
JP8	DI7

Table 2.1 The jumper and DI channels

The default setting of the input signal selection is Non-AC-Filter ( DC signal input), which is shown as below :

Input Signal Selection	Non-AC-Filter (DC Signal)	AC-Filter (AC Signal)
Jumper JP1 ~ JP8	2-3	1-2

Table 2.2 Input Signal Selection Jumper Setting

2.5 Connector Pin Assignments

The PCI-7250 card comes equipped with a 37-pin D type connector (CN1) accessible from the rear of the card ( Ref. Fig 2.1). The pin assignment of the D type connector is described by Figure 2.2.

Figure 2.2 Pin Assignment of CN1

Legend :
1. DIn - digital input low, channel n ( input signal Is not polarity sensitive)
2. NC n - normal close pin of relay n
3. NO n - normal open pin of relay n
4. COM n - common pin of relay n
5. N/C - No Connection

2.6 PCI-7250 and PCI-7251 Connection

There are 8 relay output and 8 isolation input on both PCI-7250 and PCI-7251. The PCI-7251 is used as expansion of the PCI-7250. The operations of PCI-7251 are the same as which in PCI-7250. There are at most 3 PCI-7251 expansion boards to attach on the PCI-7250. Therefore, the PCI-7250 can control up to 32 relays and sense 32 isolation signals. Figure 2.3 shows the block diagram of connecting PCI-7250 and PCI-7251.

In addition, the existance of the PCI-7251 expansion boards can be detected. Refer to the section 4.x. for using the function library.

3

Programming

In this chapter, a primitive digital I/O operations of PCI-7250 / 7251 will be specified. AC language I/O functions for the I/O operations are also included.

3.1 Control and Status Registers

The control of the relays and status of the isolation input is by means of registers. The PCI-7250 and three PCI-7251 expansion boards occupy 8 I/O address. Table 3.1 shows the registers` description and offset address relative to the base address. If the expansion PCI-7251 boards is not installed, the corresponding registers are not used and meanningless.

Offset	Write	Read	Board
0	Relay Output	Isolation Input	PCI-7250
1	not used	Output readback
2	Relay Output	Isolation Input	PCI-7251 #1
3	not used	Output readback
4	Relay Output	Isolation Input	PCI-7251 #2
5	not used	Output readback
6	Relay Output	Isolation Input	PCI-7251 #3
7	not used	Output readback

Table 3.1 The register offset and the functions

3.2 Relay Output and Readback Data

There are 8 relays on each PCI-7250 / 7251 board. Each relay are controlled by one bits of the control register. The bit value `0' means the relay is not excited. The normal open signal line is `open' with the common line and the normal closed signal line is connected with the common line. The bit value `1' means the relay is excited and the normal open signal line is now closed, and vise versa.

The initial bits values of the control register are all `0'. And the status of the relay can be readback from the readback register. If the relay is open, the corresponding bit value is `0'. If the relay is closed, the bit value is `1'.

Refer to section 4.x and 4.x for the relative function library.

Data Format of Relay Output and Readback Status Registers:

3.3 Isolation Input

There are 8 isolation input channels on each PCI-7250 / 7251 board. The status of the 8 channels can be read from the isolation input register. Each bit is corresponding to each channel. As the DI status are controlled by one bits of the control register. The bit value "1" means input voltage is high and "0" menas input voltage is low.

Data Format :


Relay Output :





Bit	7	6	5	4	3	2	1	0
Iso. Input	DI7	DI6	DI5	DI4	DI3	DI2	DI1	DI0







4

 

Relay Outputs & Isolated Inputs

The PCI-7250 contains two types of relay : Form C and Form A. The relay R0 ~ R3 are form C relays, and R4 ~ R7 are plain form A type. The difference between these two types of relay are :

1. Form C Relay : (R0 ~ R3)





 

Form C relay has three contacts : NC (Normal Close), NO (Normal Open), and COM (Common). The CM post, located at the middle, can make contact either NO post or NC post. When the control bit is high (1), the COM post and NO post are contacted. If the control bit is low (0), the COM post and NC post make contact.

In normal power-up and reset, the relay is in low status.

2. Form A Relay : (R4 ~ R7)



 

Form A relay only has two contacts : NC (Normal Close) and COM (Common). The COM post can make contact either NO post or not contact NO post. When the control bit is high (1), the COM post and NO post are contacted. If the control bit is low (0), the COM post and NO post does not make contact.

In normal power-up and reset, the relay is in low status.

The relay output contacts are rated for a maximum of 0.5A at 120VAC (resistive), 1A 24VDC, or 0.3A 60VDC. You should reduce these ratings for inductive loads. For more detailed information of relay contact, please refer Appendix B.

4.2 Using Isolated Input

The PCI-7250 contains 8 identical opto-isolated control input channels. The circuit diagram of the isolated input channel is shown on next page. The digital input is first routed through a photo-coupler (PC-814), so that the connection are not polarity sensitive whether used on AC or DC voltage.

In addition, a single-pole filter with a time constant about 5ms is used to filter when the AC inputs passed through.

Vin = I F X Ri


Pw = Vin X I F


For example, if the input voltage is 110V, then the Ri should be replace by


Ri = 110 (V) / 0.01 (A) = 11 K


Pw = 110 (V) X 0.01 (A) = 1.1 W





5

 

C/C++ Libraries

In this chapter, the PCI-7250's software drivers : C/C++ language library for DOS is described.

5.1 Installation

5.1.1 Backup Your Disk

The Utility Software and Library supplied with PCI-7250 are in DOS format which is compatible with DOS 3.0 or higher reversions. It is advisable to make a back up copy before using the software.

For a direct back up, use the DOS DISKCOPY or alternatively XCOPY *.* to a pre-formatted disk. The back up procedures are specified as follows:

1. Insert "Utility and Library" Diskette into floppy drive A:


2. XCOPY a:*.* b:/s

5.1.2 Installation

The PCI-7250's Utility Diskette includes a utility software,

C-language library, DLL libraries and some demonstration programs which can help you reduce programming work.

Due to the installation on different O.S. platforms should follow different procedures. The installation procedures are classified to four O.S..

_ MS-DOS Installation :


You will need to manually copy the contents of diskette to your hard disk. The procedures should be followed as :


1. Turn your PC's power switch on


2. Put the " PCI-7250 Utility & Library " diskette into your floppy drive A: or B:


3. Install for DOS environment


A\> CD\DOS


A:\DOS> SETUP

5.2 Running Testing Utility ( 7250UTIL.EXE)

After finishing the installation, you can execute the utility by typing as follows :

C> cd \7250\DOS\UTIL


C> 7250UTIL


the following diagram will be displayed on you screen. You can test the functionality :



1. Digital Input and Output of PCI-7250

5.3 Software Driver Naming Convention

The functions of PCI-7250's software drivers are using full-names to represent the functions' real meaning. The naming convention rules are :

In DOS Environment :


_{hardware_model}_{action_name}. e.g. _7250_Initial ().


In order to recognize the difference between DOS library and Windows library, A capital "W" is put on the head of each function name of the Windows DLL driver. e.g. W_7250_Initial ()



There are 20 function calls provided by each driver for PCI-7250 Digital I/O cards; all drivers ( DOS, Win-31, Win-95 and Win-NT) provide the same function capability. The function names using in Windows is only a capital "W" is put on the head of each function name of DOS library.


The detailed description of each function are specified in the following sections.

5.4 _7250_Initial
@ Description

A PCI-7250 card is initialized according to the card number.


Because the PCI-7250 is PCI bus architecture and meets the plug and play design, the IRQ and base_address ( pass-through address) are assigned by system BIOS directly.


Every PCI-7250 card has to be initialized by this function before calling other functions.


Note : Because configuration of PCI-7250 is handled by the system, there is no jumpers or IRQ selection on the PCI boards that need to be set up by the users.


@ Syntax


assigned by system BIOS directly.


@ Syntax


C/C++ ( DOS)


U16 _7250_Initial(U16 *existCards, PCI_INFO *pciInfo )


@ Argument :





existCards : The numbers of installed PCI-7248 cards. The returned value shows how many PCI-7248 cards are installed in your system.





pciinfo: It is a structure to memorize the PCI bus plug and play initiallization information which is decided by p&p BIOS. The PCI_INFO structure is defined in PCI_7250.H. The base I/O address and the interrupt channel number is stored in pciinfo which is for reference.


@ Return Code :


U16 means unsigned short integer


ERR_NoError


ERR_PCIBiosNotExist

5.5. _7250_DI
@ Description

This function is used to read data from digital input port. There are 8-bit digital inputs on the PCI-7250 or PCI-7251 extended board. You can get all 32 input data from _7250_DI by using this function.


@ Syntax


C/C++ ( DOS)


U16 _7250_DI( U16 cardNo, U16 diChannelNo, U8 *diData )


@ Argument :


cardNo : card number to select borad


diChannelNo : Digital Input Channel No, the constant is


DI_PORT0 0x00 Access the 8 Digital Input of PCI-7250
DI_PORT1 0x01 Access the 8 Digital Input of
Expansion Board PCI-7251#1
DI_PORT2 0x02 Access the 8 Digital Input of
Expansion Board PCI-7251#2
DI_PORT3 0x03 Access the 8 Digital Input of
Expansion Board PCI-7251#3



diData : return 8-bit value from digital port.



@ Return Code :

5.6. _7250_DO
@ Description

This function is used to write data to digital output port which can energized RELAY ON/OFF. There are 8-bit digital outputs on the PCI-7250 or PCI-7251 extended board. You can control all 32 RELAYs through _7250_DO by using this function.


@ Syntax


C/C++ ( DOS)


U16 _7250_DO(U16 cardNo, U16 doChannelNo, U8 doData )


@ Argument :


cardNo : card number to select borad


doChannelNo : Digital Output Channel No, the constant is


DO_PORT0 0x00 Access the 8 Digital Input of PCI-7250
DO_PORT1 0x01 Access the 8 Digital Input of
Expansion Board PCI-7251#1
DO_PORT2 0x02 Access the 8 Digital Input of
Expansion Board PCI-7251#2
DO_PORT3 0x03 Access the 8 Digital Input of
Expansion Board PCI-7251#3



diData : value will be written to digital output port



@ Return Code :


ERR_NoError

5.7. _7250_DO_Read_Back
@ Description

This function is used to read-back data from digital output port which is control by 7250_DO function. There are 8-bit digital outputs on the PCI-7250 or PCI-7251 extended board. You can get back all 32 RELAYs status ( ON or OFF) by using this function.


@ Syntax


C/C++ ( DOS)


U16 _7250_DO_Read_Back (U16 cardNo, U16 doChannelNo, U8 *doReadBackData )


@ Argument :





cardNo : card number to select borad


doChannelNo : Digital Output Channel No, the constant is


DO_PORT0 0x00 Access the 8 Digital Input of PCI-7250
DO_PORT1 0x01 Access the 8 Digital Input of
Expansion Board PCI-7251#1
DO_PORT2 0x02 Access the 8 Digital Input of
Expansion Board PCI-7251#2
DO_PORT3 0x03 Access the 8 Digital Input of
Expansion Board PCI-7251#3



diReadBackData : value is read back from digital output port





@ Return Code :





ERR_NoError




5.8. _7250_Check_Exist
@ Description





This function is used to check the exist of PCI-7251 expanded board. For normal configuration, each PCI-7250 can be connected with three expanded PCI-7251 boards. This function can be used to check if each of the PCI-7251 is existed or not.


@ Syntax


C/C++ ( DOS)


U16 _7250_Check_Exist (U16 cardNo, U16 extnesionBoardNo)


@ Argument :





cardNo : card number to select borad


existBoardNo : Extension PCI-7251 No.


PCI_7251_EX1 0x01 PCI-7251 Board #1
PCI_7251_EX2 0x02 PCI-7251 Board #2
PCI_7251_EX3 0x03 PCI-7251 Board #3
@ Return Code :
PCI_7251_EXIST 1


PCI_7251_NOT_EXIST 0


 

6

 

Troubleshooting

If your PCI-7250 can not work properly, use the information in this chapter to isolated the problem. You can use the DOS debug program to verify the functionality of your PCI-7250 card. The verification procedures are as follows.

Note : Before doing the following procedures, please inspect your PCI-7250 is not damaged and your computer system is proper operation.

1. Plus your PCI-7250 into your PCI slot, and turn the power on.


2. Make sure the base address, which is assigned by system BIOS, is shown when the system is booted up, such as base address is Hex 6000


3. In DOS environment, execute DOS DEBUG utility


C> DEBUG <cr>


4. Using the following instructions to evaluate PCI-7250`s I/O functions.


- O 6000 FF ` All relay are energized and all LEDs will be `turn on


- O 6000 00 ` All relay are OFF and all LEDs will be turn off


Prepare some input signals and connection with your PCI-7250 card, and check its input status.


- I 6000 ` the input status will be read


 

If you get any incorrect results, such as the LEDs does not turn on or off, or the input status does not match with your input signals. Please contact your agent for extra service.


Note : Before returning your PCI-7250 card for repair, please call your agent at first.

Appendix A. Relay Contact Protection Circuits

The contacts are the most important elements of relay constructions, Contact performance conspicuously influenced by contact material, and voltage and current values applied to the contacts.

Another important issue is contact protection, a right contact protection circuit can suppress the counter emf to a low level. However, note that incorrect use will result in an adverse effect. Typical contact protection circuits are given below :

1. RC Circuit


This circuit is suitable for DC application. If the load is a timer, leakage current flows through the RC circuit causing faulting operation.






The below circuit is suitable for both AC and DC applications. If the load is a relay or solenoid, the release time lengthens. Effective when connected to both contacts if the power supply voltage is 24V or 48V and the voltage cross the load is 100 to 200V.








Device Selection :


As a guide in selecting R and C,


R : 0.5 to 1 per 1V contact voltage


C : 0.5 to 1 µF per 1A contact current


Value vary depending on the properties of the capacity C acts to suppress the discharge the moment the contacts open. Resistor R acts to limit the current when the power is turned on the next time. Test to confirm. Use a capacitor with a breakdown voltage of 200 to 300V. Use AC type capacitors (non-polarized) for AC circuits.





2. Diode Circuit


This circuit is suitable for DC application. The diode connected in parallel causes the energy stored in the coil to flow to the coil in the form of current and dissipates it as joule heat at the resistance component of the inductive load. This circuit further delays the release time compared to the RC circuit.











Device Selection :


Use a diode with a reverse breakdown voltage at least 10 times the circuit voltage and a forward current at least as large as the load current. In electronic circuits where the circuit voltages reverse breakdown voltage of above 2 to 3 times the power supply voltage.





3. Diode & Zener diode Circuit


This circuit is also suitable for DC application. Effective when the release time i the diode circuit is too long.











Device Selection :


Use a zener diode with a zener voltage about the same as the power supply voltage.





4. Varistor Circuit


This circuit is also suitable for both AC & DC applications. Using the stable voltage characteristics of the varistor, this circuit prevents excessively high voltages from being applied across the contacts. This circuit also slightly delays the release time. Effective when connected to both contacts of the power supply voltage is 24 or 48V and the voltage across the load is 100 to 200 V.

Product Warranty/Service

Seller warrants that equipment furnished will be free form defects in material and workmanship for a period of one year from the confirmed date of purchase of the original buyer and that upon written notice of any such defect, Seller will, at its option, repair or replace the defective item under the terms of this warranty, subject to the provisions and specific exclusions listed herein.

This warranty shall not apply to equipment that has been previously repaired or altered outside our plant in any way as to, in the judgment of the manufacturer, affect its reliability. Nor will it apply if the equipment has been used in a manner exceeding its specifications or if the serial number has been removed.

Seller does not assume any liability for consequential damages as a result from our products uses, and in any event our liability shall not exceed the original selling price of the equipment.

The equipment warranty shall constitute the sole and exclusive remedy of any Buyer of Seller 9273 equipment and the sole and exclusive liability of the Seller, its successors or assigns, in connection with equipment purchased and in lieu of all other warranties expressed implied or statutory, including, but not limited to, any implied warranty of merchant ability or fitness and all other obligations or liabilities of seller, its successors or assigns.

The equipment must be returned postage-prepaid. Package it securely and insure it. You will be charged for parts and labor if you lack proof of date of purchase, or if the warranty period is expired.

©1995 Circuit Specialists, Inc.