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Re-engineered and retrofitted
application
Manufacturing News Center - Wastewater injection
control and monitoring system gets new life with the DL205 family of PLCs
News Article-November11, 2004-Jobwerx News-PrimmTech
Corporation, along with New System Technology, both of Houston, TX,
re-engineered and retrofitted a wastewater injection control and monitoring
system using the DL205 family of PLCs. The DL205 system performs 15-minute
averaging and daily min/max data logging using the F2-CP128 coprocessor.
The averaging and min/max calculations are performed in the DL260 in
stage-based ladder with the 7-day data log being implemented in the
F2-CP128. The DL260 also performs parallel PID control of system flow
using proportional valves and a variable-speed motor drive pump. PID
state management is performed in stage ladder. The DL260 plant control
and monitoring ladder is written almost completely in stage logic to
significantly reduce code complexity and length and improve program
interpretation and maintenance. The DL260 performs complex tank volume
calculations in ladder as well as all analog floating point engineering
unit conversions and alarm limit checks.
An SMTP alarm messaging system uses the DL260, AutomationDirect OPC
server, and custom OPC/SMTP client for 24-hour alarm annunciation to
cell phones or pagers. 15-minute and hourly data is retrieved and logged
by a custom OPC/Database client that also produces daily, monthly and
quarterly reports.
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PrimmTech Corporation, New System Technology
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