CLS200 Series User’s Guide
Chapter 5: Enhanced Features
98
Process Variable Retransmit
The process variable retransmit feature retransmits the process signal of one loop (primary) via the
control output of another loop (secondary). This signal is linear and proportional to the engineering
units of the primary loop input.
Typical uses include data logging to analog recording systems and long distance transmission of the
primary signal to avoid degradation of the primary signal. The signal can also be used as an input to
other types of control systems such as a PLC.
Any available output (heat or cool) may be used as a retransmit output. Any process variable
(including the same loop number input) may be retransmitted.
The controller output signal must be connected to a Dual DAC or Serial DAC converter to get a
4 to 20mA DC or 0 to 5VDC signal. The choice of converter depends on application requirements.
The process variable retransmit feature is included in both the ramp/soak and enhanced features
options.
NOTE! If an output is defined as a process variable retransmit, it cannot be used for PID
control.
Process Variable Retransmit Menu
The setup parameters for the process variable retransmit feature appear in the SETUP LOOP PV
RETRANSMIT menu.
ALARM
SETUP LOOP 02
PV RETRANSMIT?
Press YES to view the process variable retransmit parameters.
Retransmit Process Variable
Enter the number of the loop that provides the process variable for the retransmit calculation.
If you set this parameter to NONE and press NO, the controller skips to the COOL OUTPUT
RETRANS PV screen. The COOL parameter is set up the same way as the HEAT parameter.
ALARM
02 HEAT OUTPUT
RETRANS PV? 02
Selectable values: Any loop or NONE.
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