Glossary
11
output bit
A bit in the IR area that is allocated to hold the status to be sent to an output de-
vice.
output device
An external device that receives signals from the PLC System.
output point
The point at which an output leaves the PLC System. Output points correspond
physically to terminals or connector pins.
output signal
A signal being sent to an external device. Generally an output signal is said to
exist when, for example, a connection point goes from low to high voltage or from
a nonconductive to a conductive state.
overflow
The state where the capacity of a data storage location has been exceeded.
overseeing
Part of the processing performed by the CPU Unit that includes general tasks
required to operate the PLC.
overwrite
Changing the content of a memory location so that the previous content is lost.
parity
Adjustment of the number of ON bits in a word or other unit of data so that the
total is always an even number or always an odd number. Parity is generally
used to check the accuracy of data after being transmitted by confirming that the
number of ON bits is still even or still odd.
parity check
Checking parity to ensure that transmitted data has not been corrupted.
PCB
See
printed circuit board
.
PC Setup
A group of operating parameters set in the PC from a Programming Device to
control PLC operation. (Called “PC Setup” within the software.)
Peripheral Device
Devices connected to a PLC System to aid in system operation. Peripheral de-
vices include printers, programming devices, external storage media, etc.
peripheral servicing
Processing signals to and from peripheral devices, including refreshing, com-
munications processing, interrupts, etc.
PLC
See
Programmable Controller
.
PLC configuration
The arrangement and interconnections of the Units that are put together to form
a functional PLC.
PLC System
With building-block PLCs, all of the Units connected up to, but not including, the
I/O devices. The boundaries of a PLC System are the PLC and the program in its
CPU Unit at the upper end; and the I/O Modules at the lower end.
port
A connector on a PC or computer that serves as a connection to an external de-
vice.
positive delay
A delay set for a data trace in which recording data begins after the trace signal
by a specified amount.
Power Supply Unit
A Unit that connected to a PC that provides power at the voltage required by the
other Units.
present value
The current value registered in a device at any instant during its operation. Pres-
ent value is abbreviated as PV. The use of this term is generally restricted to tim-
ers and counters.
printed circuit board
A board onto which electrical circuits are printed for mounting into a computer or
electrical device.
PROGRAM mode
A mode of operation that allows inputting and debugging of programs to be car-
ried out, but that does not permit normal execution of the program.
Содержание CPM1A-20CAR-A
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Страница 29: ...14 System Configuration Section 1 2...
Страница 43: ...29 Unit Components Section 2 2...
Страница 65: ...51 Wiring and Connections Section 3 4...
Страница 123: ...Appendix B Dimensions 2 CPM1 CIF01 90 81 21 30 205 50 56 CPM1 CIF11 90 81 21 30 205 50 61...
Страница 124: ...Appendix B Dimensions 3 Dimensions with Peripheral Devices Attached Approx 90 Approx 125...
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