ADLINK cPCI-7252 - Manual (Page 11)

Introduction 1
1 Introduction
The PCI-7250/7251, cPCI-7252, and LPCI-7250 Relay Actuator
and Isolated D/I cards are basic Digital I/O cards for PCI bus com-
pliant computers used in industrial applications.
This PCI-7250/7251 provide 8 relay actuators and 8 opto-isolated
digital inputs. Of the eight relays, four are Form C (R0~R3) and
four are Form A (R4~R7). The cPCI-7252 provides 8 relay actua-
tors and 16 opto-isolated digital inputs; all relays are Form C. The
LPCI-7250 provides 8 relay actuators and 8 opto-isolated digital
inputs; all relays are Form C. They are very suited for constant
ON/OFF control devices. For convenience the above models will
be referred to as PCI-725X in this manual.
All digital input channels are isolated and suitable applications in
noisy environment. For identical non-polarized opto-isolated digital
input channels, switching can be carried out using AC-filtered or
non-AC-filtered channels.
PCI-7250 is equipped with LEDs to reflect the status of each relay
output. When a 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 addresses. When a bit is read or written, its output status will
be controlled, or its input status will be monitored. The I/O signals
are routed through to a 37-pin D-type or a 50-pin SCSI-II connec-
tor.