csmstr - Omega Engineering

MODULE CONFIGURATION
CSSG – STRAIN GAGE INPUT PID MODULE PROGRAMMING
LINEAR OUTPUT
• The Output Type property is used to select between 0-10 V, 0-20 mA, or 4-20
mA outputs. Make sure that the output jumpers, located on the side of the
module, are set for the same output type.
• The Mapping property is used to assign the module’s analog output to one of
various internal properties or values.
• The Drive Min At and Drive Max At values are used to scale the analog output.
The units expressed are the same as those of the Mapping value, so the
numerical limits vary eg. values of 0% and 100% are typically used to control a
process.
• The Output Filter is a time constant entered in seconds that dampens the
response of the analog output. Increasing the value increases the dampening.
• The Output Deadband value can be used to prevent the analog output from
changing when only small adjustments are called for. This is useful in preventing
mechanical wear when driving a linear input valve. The analog output will not
adjust unless the change called for exceeds half of the deadband value. i.e. With
a deadband of 10 %, and an output value of 50 %, the output will not change
until 45 % or 55 % is called for. The units expressed are the same as those of the
Mapping value.
• The Output Update time can be used to decrease the update frequency of the
analog output. When the Output Update timer expires, the analog output checks
to see if the required change is greater than the Output Deadband value. If the
required change is greater, the output will reflect the new value. If not, the output
does not change, and the timer starts again.
AUTO-TUNING
OVERVIEW
Auto-tune may be used to establish the optimal P, I, D, and Power Filter values. By cycling
the process through four on/off cycles, the module learns information about the process, and
determines the best values.
REVISION 6 PAGE 43