ABB PM581 Serial Communication and Ethernet Interface and Programming Module

Description

PM581 Most of the operation of the Safeguard/AC410 base system is transparent to the end user, who

only sees the system database and application program, unless explicitly accessing other

functions by means of system commands.

Database

The database is distributed to PM581 each individual Safeguard 400 Series controller. Access is

symbolic, which means that all information is available by specifying the signal name. All

relevant information about an I/O point or a loop is available in one record, which is

simultaneously updated to ensure that all data for PM581 a single point is consistent.

The following data given in the database specifies how the underlying software will treat that

point:

• Name, description, service status etc. for all objects.
• Range, hysteresis, scaling, filtering, PM581 addresses etc. provides data for the I/O handlers to

access the hardware to obtain data, perform basic treatment and convert it to engineering

units

• Alarm limits and alarm handling parameters specify how event and alarm handling is to be

carried out.

• Engineering unit, number of decimals, accessed, blocked, manual entry and others define

basic parameters for the operator interface.

Application program

The application program works with the database to define additional treatment (for example

input voting) and the cause & effect algorithm. This program can be designed in two formats:

• As a function block program, using the functional element library of basic algorithms.
• As a cause & effect chart, table files loaded in the system.

2.1.2 PM581 AMPL Safeguard features

AMPL is a function block language with graphical representation. The function blocks offer a

high level of configuration from simple to complex. The language is common for all ABB

controller products with Master software. However, as the products are optimized to different

application areas the functional extent and the execution environments differ between the

products. For the Safeguard 400 Series the following AMPL elements are supplied additionally,

either as an option or as a part of the base product.

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