Rockwell Automation 1785-Vx0B, D17856.5.9 PLC-5 VME VMEbus Programmable Controllers User Manual - Manual (Page 10)

Preface
Using this Manual
iv
We refer to the: As the:
Data Highway DH link
Data Highway Plus

DH+

link
Programmable Logic Controller processor
PLC-5

Processor PLC-5/VME processor. Unless noted otherwise,
we use PLC-5/VME processor to denote all processors.
Programmable Controller
Communications Commands PCCC
Release on request ROR
Release when done RWD
Term Definition
Extended-local I/O I/O connected to a processor across a parallel link, thus limiting its
distance from the processor
Extended-local I/O link a parallel link for carrying I/O data between a PLC-5/V40L
processor and extended-local I/O adapters
Remote I/O link a serial communication link between a PLC-5 processor port in
scanner mode and an adapter as well as I/O modules that are
located remotely from the PLC-5 processor
Remote I/O chassis the hardware enclosure that contains an adapter and I/O modules
that are located remotely on a serial communication link to a
PLC-5 processor in scanner mode
Discrete-transfer data data (words) transferred to/from a discrete I/O module
Block-transfer data data transferred, in blocks of data up to 64 words, to/from a block-
transfer I/O module (for example, an analog module)
In addition, you may encounter words in different typefaces. We use these
conventions to help differentiate descriptive information from information
that you enter while programming your processor.
The Enter key looks like this (boldface and in brackets):
[Enter]
Words or commands that you enter appear in boldface. For example:
CTV # SVI
Variables that you enter appear in italics. For example:
vmeaddr width
“Type” means type in the information.
“Enter” means type in the information and then press the [Enter] key.
Terms and Conventions