PLC
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5.2 General
PowerMACS PLC has a primary assignment to interface customer control system and peripheral devices
through different communication interfaces. It is used as ”glue” between various functions within the
system, as for example:
Start of tightening from digital inputs
Output of status to digital outputs
Controlling flow of data
Analyzing ID codes
The PLC has interfaces to several other units in the PowerMACS system.
API and external
serial comm.
devices
The System Globals are inputs that represent the state of, and outputs that are used to control the
tightening process within PowerMACS. All these signals are described in chapter: System Globals.
The PLC Console interface is a simple, but still powerful, interface between the PLC program and the
ToolsTalk PowerMACS application running on the Console Computer. See chapter: PLC Console for a
detailed description of it.
From Digital I/O the PLC can read digital inputs (push buttons, switches etc.) and write digital outputs
(lamps, relays etc.) that have been configured in PowerMACS using an I/O device. See chapter: I/O
Device for how this is done.
The Fieldbus interface makes it possible to access signals in the PowerMACS PLC from a fieldbus
master. From the master it is then possible to write and read data in order to control the system and check
its status. See chapter: Fieldbus Interface for a description of this interfaces and how it is configured.
The API and external serial communication interface makes it possible to access signals in PLC from
external application from an external PC program or via some serial communication protocols. This is
handled much in the same way as the fieldbus interface. See chapter: API, Application Programmers
Interface and Serial Communication for a description of these interfaces and how they are configured.
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