PID controller offers relief to SLC 500
A
Red Lion Controls product story
Edited by the Engineeringtalk editorial team
Nov 29, 2001
A new dual PID controller from Red Lion will both simplify and reduce the costs of using multiple PID loops with an Allen-Bradley SLC 500, by lifting the burden of PID control from the controller
A new dual PID controller from Red Lion will both simplify and reduce the costs of using multiple PID loops with an Allen-Bradley SLC 500.
Designated the DLCD, the new DIN-rail mounted module implements two independent PID loops, communicating with a SLC 500 over the DH-485 network, to allow a PLC program to control and monitor each loop's operation.
By lifting the burden of PID control from the controller, the need for expensive I/O cards is avoided and valuable PLC memory and processing power are made available for other tasks.
Not only does this provide a more effective solution but it is estimated that it will save users up to £80 per loop in hardware costs.
The DLCD is a true plug-and-play solution, controlling all communication between itself and the SLC 500 and therefore avoiding the need for even a single rung of ladder programming.
All of the DLCD's features can be configured using Red Lion's, user-friendly, Windows based configuration package.
Alternatively, the PLC, the DLCD can be configured to read all of its parameters from the controller's data tables.
This allows hot swapping of devices without the need for any configuration operations beyond the setting of a few DIP switches.
This is ideal for OEMs wanting to simplify maintenance procedures in order to reduce the cost of ownership of their machines.
The PID control algorithm used in the DLCD has been tried and tested in the field, having been used in Red Lion's acclaimed temperature controllers for many years.
It provides advanced auto-tune facilities, multiple alarms, heat-cool operation, plus input and output filtering.
Any application where a SLC 500 is used in conjunction with temperature control will benefit from the DLCD's improved performance and reduced cost.
Specifically, the exceptional control accuracy of the DLCD makes it perfect for extruders, injection and blow molders, ovens and furnaces, and food processing applications.
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