ProFire PF2200-SB Product Manual page 21

Process Setpoint Adjustment Input
In addition to the features mentioned above, Auxiliary Input 2 also supports a Process Setpoint
Adjustment mode. The Process Setpoint Adjust mode is intended to be connected to a 4-20mA signal
sourced by a PLC which allows the application to provide advanced temperature control (e.g. cascaded
PID). By utilizing the span setting (max and min) for the setpoint, this system allows the process
setpoint to be adjusted based on the input signal. Note: the system still adheres to the safety
constraints of the system regarding setpoints (i.e. setpoint cannot exceed the high temp ESD setpoint).
The following table outlines the behavior of the system with respect to the Process Setpoint Adjustment
input:
Input Configuration
Disabled
4-20mA
Event
Any
Out of range
Active range, system not in process
control
Active range, system in process control
System Behavior
No Effect
Alarm
No Effect
Run with process setpoint set by
Process Setpoint Adjustment
Input
Section 2: PF2200-SB PRODUCT DESCRIPTION
V 4.0
Page 21 of 85