Valve controller takes Ethernet onboard
A
Rotork Controls product story
Edited by the Engineeringtalk editorial team
Dec 1, 2004
The latest version of the Rotork Pakscan two-wire digital control system for valve actuators incorporates an Ethernet connection from the loop master station.
The latest version of the Rotork Pakscan two-wire digital control system for valve actuators incorporates an Ethernet connection from the loop master station.
Designed specifically for actuator control, Pakscan has been continuously developed throughout two decades and, with hundreds of worldwide installations, is the system of choice with many users.
The introduction of a Pakscan Ethernet master station now provides significant additional user benefits.
The Pakscan Ethernet master station, which is capable of controlling up to 240 actuators on a single loop, is connected to a PLC or DCS over an Ethernet LAN using Modbus-TCP protocol, itself one of the easiest Ethernet protocols to use.
The connection enables up to ten coincident users to access data from the master station and operates on 10Base-T and 100Base-T networks.
One of the master station's strongest features is the inclusion of an embedded web server.
Operators can simply browse to the Pakscan control loop using Internet Explorer or similar software.
Once the password is entered a comprehensive and impressive level of data is available.
Screens show the master station configuration, the order of the valve actuators on the Pakscan loop and the condition of the loop communications.
For each actuator there are pages showing current status, alarms present, tag data and, for Rotork's IQ and IQT intelligent actuators, operating torque profiles.
With the right access the valve actuators can also be controlled from these web pages.
If an alarm is generated on the system, from either an actuator or the master station, the system can send an email to a specified address indicating the nature of the fault and the time that it occurred.
The Rotork Pakscan Ethernet master station integrates seamlessly with PLC and DCS equipment and can be combined with Rotork's In-Vision Scada software for multiple user access with customised plant specific graphics.
In-Vision also adds alarm and event logging to the system.
For existing Pakscan installations, master station hardware upgrades to include Ethernet connectivity are available for retrofitting on site.
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