Rockwell-automation 1794-APB/B FLEX I/O PROFIBUS Adapter Module User M Manual de usuario descargar pdf (Pagina 115)

G–5

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LSAP or SAP

Link layer Service Access Point. A logical sub-addresses

within devices that allow the distribution of communication

flow over dedicated tasks, depending on the required

processing. FMS uses LSAPs indifferently to define generic

communication relationships between two devices (logical

communication channels). DP uses predefined LSAPs to

access specific functions or services between masters and

slaves.

master

initiates transfer of messages without any prior remote

request. The right to access the bus (token) is circulated

among the master stations. Management of this logical token

ring is performed automatically by the masters (such as

startup, removal or insertion of masters). Also referred to as

active stations or scanner.

module

any of the plug-in hardware devices that are located in the

1771 I/O chassis: processor, coprocessor, power supply or

I/O module

module slot

location in the I/O chassis for installing a module. Each

module slides into a module slot that lines up with the

backplane connector. Also referred to as slot.

multicast relationships

allow transmission of messages to a group of nodes

simultaneously, but only unconfirmed services are available.

network

a series of stations or nodes connected by some type of

communication medium. A network may consist of a single

link or multiple links.

node

an address or software location on the network. Also referred

to as node.

STATUS LED

a bicolor LED, located on the front panel of the coprocessor

that indicates the condition of the coprocessor

Object Dictionary. In FMS, an OD is a database within the

station, holding the description of all explicit communication

objects of that station and making them available for control

and monitoring.

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