User manual

PCI-1753/1753E User Manual 2
Chapter 1 General Information
1.1 Introduction
The PCI-1753 is a 96-bit digital I/O card for the PCI bus, which can be
extended to 192 digital I/O channels by connecting with its extension
board, PCI-1753E. The card emulates mode 0 of the 8255 PPI chip, but
the buffered circuits offer a higher driving capability than the 8255. The
96 I/O lines are divided into twelve 8-bit I/O ports: A0, B0, C0, A1, B1,
C1, A2, B2, C2, A3, B3 and C3. Users can configure each port as input
or output via software.
Easy to Install: Plug and Play
The PCI-1753 uses a PCI controller to interface the card to the PCI bus.
The controller fully implements the PCI bus specification Rev 2.1. All
bus relative configurations, such as base address and interrupt
assignment, are automatically controlled by software.
Dry Contact Support for Digital Input
Each digital input channel at the PCI-1753/1753E accepts either 0 ~ 5
VDC wet contact or dry contact inputs. This dry contact capability
allows the channel to respond to changes in external circuitry (e.g., the
closing of a switch in the external circuitry) when no voltage is present in
the external circuit.
Reset Protection Fulfills the True Requirement of Industrial
Applications
When the system is hot reset (the power is not turned off), the PCI-1753/
1753E can either retain the last I/O port settings and outputs value, or
return to its default configuration, depending on the jumper setting. This
function protects the system from wrong operations during unexpected
system resets.