Rockwell Automation 1756-HSC ControlLogix High Speed Counter Module User Manual
Page 116
Publication 1756-UM007C-EN-P - November 2011
116 Glossary
bus A single path or multiple parallel paths for power or data signals to which
several devices may be connected at the same time. A bus may have several
sources of supply and/or several sources of demand.
carrier-band link 1) A communication link with a single channel whose signal modulates a
carrier frequency. Example: Data Highway II link. 2) Contrasted with
broadband link (
) and baseband link (
).
cascade connection A series connection of amplifier stages or links in which the output of one
stage feeds the input of the next.
cascading timers/counters A programming technique of using multiple timers and/or counters to extend
the range of the timer or counter beyond the maximum values that may be
accumulated in a single instruction.
channel A path for a signal. Several channels may share a common link.
chassis A hardware assembly that houses devices such as I/O modules, adapter
modules, processor modules, and power supplies.
communication format Format that defines the type of information transferred between an I/O
module and its owner controller. This format also defines the tags created for
each I/O module.
compatible match An electronic keying protection mode that requires the physical module and
the module configured in the software to match according to vendor, catalog
number, and major revision. In this case, the minor revision of the module
must be greater than or equal to that of the configured slot.
configuration The arrangement and interconnection of hardware components within a
system, and the hardware (switch and jumper) and software selections that
determine the operating characteristics of the system.
connection The communication mechanism from the controller to another module in the
control system.
controlbus The backplane used by the 1756 chassis.
controller A unit, such as a programmable controller or relay panel, that controls
machine or process elements.
ControlNet network An open-control network that uses the producer/consumer model to combine
the functionality of an I/O network and a peer-to-peer network, while
providing high-speed performance for both functions.
Coordinated System Time (CST) Timer value which is kept synchronized for all modules within a single
ControlBus chassis. The CST is a 64-bit number with s resolution.