1785-UM022B-EN-P - February 2002
Preface P-3
network update time (NUT)
smallest repetitive time interval in which data can be sent on the ControlNet network
node port of a physical device connecting to the ControlNet network that requires a network
address in order to function on the network; a link may contain a maximum of 99 nodes
non-discrete I/O data transfer type of data transfer in which blocks of data transferred to or from a single I/O module use
integer input and output data table files that you specify; scheduled transfers are configured in
the ControlNet I/O map table, unscheduled transfers make use of ControlNet I/O Transfer (CIO)
instructions
owner device that controls the outputs of an adapter
processor
any one of the ConrolNet PLC-5 programmable controllers
redundant media dual-cable system that allows you to receive the best signal over a ControlNet network
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
AB Drives
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