The Fipway network provides two data sharing services:
-
common words,
-
shared table.
The main objective of these two services is to synchronize automation applications.
The common words service consists of a set of dedicated %NW words. Each station on the network can, depending on its software configuration, access the database in read or write mode.
Updates are performed implicitly at the start of the cycle for read operations and at the end of the cycle for write operations. The function of the application program is simply to read or write these words.
The addressing of the words is as follows: %NWn.s.k
The following table states the address parameters of the common words:
|
Parameter
|
Description
|
|
n
|
Network number
|
|
s
|
Station number
|
|
k
|
Word number
|
NOTE: The network number makes it possible to select the network on which the common words are exchanged in a multi-network configuration.
This service makes it possible to exchange a table of %MW internal words divided up into as many fields as there are stations on the Fipway network. The principle is based on each PLC broadcasting a word memory field to the other stations on the network.
Updates are performed implicitly and independently of the application program's execution cycle. The function of the program is simply to write or read the %MW words.
NOTE: When configuring and assigning fields, be careful to avoid creating memory conflicts between stations.
