Sharp Z-336J Uživatelský manuál stáhnout pdf (Strana 49)

7-15

Chapter 7: Computer Link Function

[8] Cyclic transfer and data area

(1) Outline of the cyclic transfer process

The cyclic transfer process is a function that supports cyclic data exchanges that occur between

nodes.

1 Establishes the common memory function.

2 Transmits when a node receives the token.

3 Nodes which do not execute cyclic transfers within the network are allowed to participate.

4 When received the token, the node sends all the cyclic data that it needs to send.

- Token: Generally, only one token exists in a network. If more than one token exists in a

network, the token with the lowest destination node number has priority and any other token

is discarded.

- Token frame: A frame with a token has a destination node number and a transmitting node

number. The node whose number matches the destination node number holding the token.

- Token order: The token rotation order is determined by the node numbers. The token is

passed to the nodes in order that the nodes were registered in the participating node man-

agement table. The node with the highest node number hands the token over to the node

with the lowest node number.

Token rotation and cyclic transfer 1

Token rotation and cyclic transfer 2

Time

Node #1

Token

Node #2 Node #3 Node #N

Node #1

Token

Node #2 Node #3 Node #N

Time

Node #1

Token

Node #2

Node #N-1

Node #N

Node #1

Token

Node #2

Node #N-1

Node #N

1 2 ... 44 45 46 47 48 49 50 51 52 53 54 ... 223 224

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Sharp Z-336J Uživatelský manuál Strana 49