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25
02/02 AWB27-1300-GB
3 Function Blocks
Overview
The function blocks of the S40-AM-TD application module
make it easier to program the data transfer between the PLC
and telecontrol modules.
Three types of function blocks are provided:
• Dial-up function block
• Telecontrol function block
• Parameter function block
The
dial-up function block
performs the following functions:
• Modem initialisation
• Establishment and clearing of the connection to
partner station
• Connection monitoring
• Redial within the set time frame
• Display of modem signals
The
telecontrol function block
carries out the communi-
cation services and monitors the execution of a service.
The
parameter function block
is used to declare the dial-
up and telecontrol function block and contains the calls for
these function blocks. The dial-up and telecontrol function
blocks cannot be processed directly. Their parameters are set
via the parameter function block. Dial-up and telecontrol
function blocks are provided in the form of a LIB file.
Depending on the capabilities of the PLCs, there are several
parameter and telecontrol function blocks that are matched
to each other. These parameter and telecontrol function
blocks vary according to the number of services and partner
stations they support. The dial-up function block is the same
for all.
The
function blocks with basic services
enable a
connection for sending and reading data between two
stations.
Содержание S40-AM-TD
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