ADLINK Technology PCI-7251 - Chapter 1 Introduction

Introduction •• 1
1
Introduction
The PCI-7250/7251 and cPCI-7252 Relay Actuator and Isolated D/I
card is a basic Digital I/O card for PCI bus computer in industrial
applications.
This PCI-7250 and PCI-7251 provide 8 relay actuators and 8 opto-
isolated digital inputs. From the eight relays, four relays are Form C
(R0~R3) and four relays are Form A ( R4~R7). The cPCI-7252
provides 8 relay actuators and 16 opto-isolated digital inputs, all relays
are Form C type. They are very suitable for ON/OFF control devices.
For the identical non-polarity opto-isolated digital input channels, each
of them can be switchable by using RC filter or non-RC filter. All
channels are isolated and suitable for collecting digital inputs in noisy
environments.
The status of each relay output is reflected by a LED. When the relay is
energized, its corresponding LED will turn ON, otherwise it is OFF.
The relay outputs and digital inputs are controlled by two bytes of I/O
address. When the corresponding bit is read or written, its output
status will be controlled, or its input status be monitored. The I/O
signals are via a 37 pin D-type connector that projects through the
computer case at the rear of the board.