Rockwell-automation 1785-Lx0C15 ControlNet PLC-5 Programmable Controll Manual de usuario descargar pdf (Pagina 11)

1785-UM022C-EN-P - February 2008

Preface-3

repeater two-port active physical-layer device that reconstructs and retransmits all traffic that it

hears on one ControlNet segment to another segment

Requested Packet Interval

(RPI)

the maximum time allowed for the ControlNet network to update requested data. The RPI is

user-selectable on a per connection basis. For more information, see page 2-2.

scheduled maximum node

(SMAX)

the maximum ControlNet node number that can transmit and receive scheduled data

scheduled transfers deterministic and repeatable transfers that are continuous and asynchronous to the ladder-

logic program scan

scheduled connection types rack connection - scheduled connection made from the PLC-5C to I/O adapters to some or

all of the discrete I/O on the adapter

module connection - scheduled connection made from the PLC-5C to I/O adapters to

individual modules

segment trunkline section of ControlNet network with terminators at each end; a segment does not

include repeaters; segments connected by repeaters make up a link

tap component that connects products to the ControlNet trunk cable; a tap is required for each

node and for each side of a repeater

terminator 75W resistor—mounted in a BNC plug—placed on each end of a ControlNet segment to

prevent reflections from occurring at the ends of the cable

trunk cable bus or central part of the ControlNet cable system

trunk-cable section length of trunk cable between any two ControlNet taps

unscheduled maximum node

(UMAX)

the maximum ControlNet node number that can transmit and receive unscheduled data

unscheduled transfers non-deterministic data transfers through ladder-initiated communication or programming

devices

Term Description

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Rockwell-automation 1785-Lx0C15 ControlNet PLC-5 Programmable Controll Manual de usuario Pagina 11