Rockwell Automation 1784-KTXD Manuel d'utilisateur télécharger pdf (Page 285)

Publication 1747-UM011F-EN-P - May 2007

Glossary 285

operating voltage

For inputs, the voltage range needed for the input to be in the

On-state. For outputs, the allowable range of user-supplied voltage.

output device

A device, such as a pilot light or a motor starter coil, that is energized

by the programmable controller.

output scan

The controller turns on, off, or modifies the devices connected to the

output terminals.

PCCC (programmable controller communication commands)

points per common

The number of input or output points connected to a single return

(common) or supply (vcc).

poll message

A poll message is a point-to-point transfer of data sent by the scanner

that solicits a response from a single device. The device responds with

its data bit and status bit.

processor

A Central Processing Unit. (See CPU.)

processor files

The set of program and data files resident in the controller.

program file

Areas within a processor that contain the logic programs. SLC

controllers support multiple program files.

program mode

When the controller is not scanning the control program.

program scan

A part of the controller’s operating cycle. During the program scan,

the logic program is processed and the Output Image is updated.

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Rockwell Automation 1784-KTXD Manuel d'utilisateur Page 285