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Master Station Safe Use, Installation and Maintenance Manual
The Rotork Master Station provides an intelligent interface between a host Modbus system and the connected Field Control Units (FCUs). It
performs the functions of running the field network, data aggregator, data viewer and managing the host Modbus database.
The Modbus database presented to the host is independent of the field network protocol, giving a common open industry standard
interface to the host for process control information.
The host Modbus connection is Ethernet (TCP) as standard, with the connections on the CPU module itself. For applications that require a
serial host connection a Host Serial Add In Module (AIM) is required to provide the serial connection.
In addition to the Modbus host database, the Master Station has a local display where the user can interrogate configuration, status and
alarm data from FCUs or the Master Station. For remote access, the Master Station has built-in web pages mirroring the localdisplay.
There are two different field networks available as AIMs for the Master Station and up to four AIMs can be fitted to the Master Station.
The field network AIMs run the individual field networks, distributing commands and collecting data from the FCUs to populate the host
database. Two different field network AIMs (Modbus and Pakscan Classic) are available and one serial host RTU AIM is available.
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Pakscan Classic field network AIM
The Pakscan Classic redundant loop network has been the network of choice for actuator control for over 30 years. Using robust current
loop technology, 20 km loop lengths and 240 FCUs are possible.
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Modbus Open field network AIM
Open Modbus field network with standard highway or redundant loop options. Other manufacturers' devices integrated into network by
use of a field device description file.
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Host Serial AIM
Open Modbus serial connection for host controllers.
The Rotork Master Station can be supplied in three different configurations:
Single: A single sided Master Station comprising one display, one PSU module, one CPU module and up to four AIMs.
Dual: A dual sided Master Station comprising two displays, two PSU modules, two CPU modules and up to eight AIMs total.
Each side can have different hardware configurations and remains separate from the other side.
Hot Standby: A dual sided Master Station comprising the same options as a single sided Master Station with a complete duplicate of
modules for the second side. This enables switching between each side with no impact to network communications.
1. Introduction
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