Rockwell Automation 1772-L8_LW_LWP_LX_LXP,D17726.5.8 User Manual User Manual

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Glossary

Appendix D

D-11

Interlock
A device actuated by the operation of some other device to which it is
associated, to govern the succeeding operation of the same or
allied devices.

I/O
Input/Output

I/O Channel
A data transmission link between a processor scanner module and an I/O
adapter module.

I/O Chassis
See chassis

I/O Module
A device that interfaces between the user devices and the processor.

I/O Rack
See Rack.

I/O Scan Time
The time required for the processor to monitor inputs and control outputs.

I/O Terminal
A terminal on the I/O module. One I/O terminal has a corresponding bit
address in the data table.

Isolated I/O Module
A module which has each input or output electrically isolated from every
other input or output on that module.

K
2

= 1K = 1024. Used to denote sizes of memory and can be used in bits,

bytes, or words. Example: 2K = 2048.

k
Kilo. A prefix used with units of measurement to designate quantities
1000 times as great.

Keying
Plastic bands installed on backplane connectors to ensure that only one
type of module can be inserted into a keyed connector.