Glossary
117
I/O capacity
The number of inputs and outputs that a PC is able to handle. This number
ranges from around one hundred for smaller PCs to two thousand for the largest
ones.
I/O delay
The delay in time from when a signal is sent to an output to when the status of the
output is actually in effect or the delay in time from when the status of an input
changes until the signal indicating the change in the status is received.
I/O device
A device connected to the I/O terminals on I/O Units. I/O devices may be either
part of the Control System, if they function to help control other devices, or they
may be part of the controlled system.
I/O interrupt
An interrupt generated by a signal from I/O.
I/O point
The place at which an input signal enters the PC System, or at which an output
signal leaves the PC System. In physical terms, I/O points correspond to termi-
nals or connector pins on a Unit; in terms of programming, an I/O points corre-
spond to I/O bits in the IR area.
I/O refreshing
The process of updating output status sent to external devices so that it agrees
with the status of output bits held in memory and of updating input bits in memory
so that they agree with the status of inputs from external devices.
I/O response time
The time required for an output signal to be sent from the PC in response to an
input signal received from an external device.
I/O Unit
The Units in a PC that are physically connected to I/O devices to input and output
signals. I/O Units include Input Units and Output Units, each of which is available
in a range of specifications.
I/O word
A word in the IR area that is allocated to a Unit in the PC System and is used to
hold I/O status for that Unit.
IBM PC/AT or compatible
A computer that has similar architecture to, that is logically compatible with, and
that can run software designed for an IBM PC/AT computer.
increment
Increasing a numeric value, usually by 1.
indirect address
An address whose contents indicates another address. The contents of the
second address will be used as the actual operand.
initialization error
An error that occurs either in hardware or software during the PC System
startup, i.e., during initialization.
initialize
Part of the startup process whereby some memory areas are cleared, system
setup is checked, and default values are set.
input
The signal coming from an external device into the PC. The term input is often
used abstractly or collectively to refer to incoming signals.
input bit
A bit in the IR area that is allocated to hold the status of an input.
input device
An external device that sends signals into the PC System.
input point
The point at which an input enters the PC System. Input points correspond
physically to terminals or connector pins.
input signal
A change in the status of a connection entering the PC. Generally an input signal
is said to exist when, for example, a connection point goes from low to high volt-
age or from a nonconductive to a conductive state.
install
The preparation necessary to use a program or software package, such as the
LSS or SSS, on a computer.
Summary of Contents for SYSMAC CPM1
Page 1: ...Cat No W262 E1 4 Programmable Controllers SYSMAC CPM1 OPERATION MANUAL ...
Page 2: ...CPM1 Programmable Controllers Operation Manual Revised February 1998 ...
Page 116: ...105 Appendix B Dimensions All dimensions are in millimeters CPM1 10CDR j 121 130 85 81 90 ...
Page 118: ...Appendix B Dimensions 107 CPM1 20EDR 81 90 171 180 85 ...
Page 119: ...Appendix B Dimensions 108 CPM1 CIF01 90 81 21 30 205 50 56 CPM1 CIF11 90 81 21 30 205 50 61 ...