Glossary
372 SPU 780 01EMAN May 2002 317
Quick Print A function that allows you to print a network to a printer, with or without
documentation.
Rack A collection of up to 16 I/O modules mounted in one back plane.
Radix The base system of a value. The radix of decimal numbers is 10, the radix of binary
numbers is 2 and the radix of hexadecimal numbers is 16. In ProWORX 32, the term
"radix" sometimes refers to a value’s data type: binary, integer, floating point and so
on.
Random Access
Memory (RAM) Random Access Memory. Memory that holds programs while they are being
executed.
Read Only
Memory (ROM) Memory that is not erased by a power failure and that is programmed at the factory
to hold vital information. This memory cannot be changed.
Remote I/O (RIO) One of four major architectures for input/output systems (also see Distributed I/O,
Local I/O, and Peer-to-peer Communications). I/O that is installed away from the
PLC and communicates with it though a high-performance, S908 coaxial cable
network. For Quantum controllers, an interface device at each remote I/O drop
communicates with an RIO processor in the PLC. The interface device sets the
address of the drop. Each RIO processor supports up to 31 remote drops, each of
which allows 64 input words and 64 output words.
Remote Terminal
Unit (RTU) A data transmission mode used for Modbus communications. R TU us es 8 data bits.
Reports Listing A group of printouts which consist of hardware allocation, data usage, and data
contents for a ladder logic program.
Routing Path The sequence of devices through which a message passes to reach its final
destination.
RS-232 A popular standard for a serial data link connection.
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