Rockwell Automation 900-TC32 Digital Temperature Controllers, Series B - Manual (Page 86)

Publication 900-UM007D-EN-E - January 2011
3-16 Configuration & Basic Operation
2. Press the
U or D key until the set point displayed is 200°C. To load
the value into the controller memory, either press the
O
key or wait
2 seconds.
Figure 3.18
Selecting PID Control or
ON/OFF Control Overview
The Bulletin 900 Controller supports two control methods: (1) 2-PID control
and (2) ON/OFF control. The control method is selected by the PID
ON/OFF parameter in the Initial Setting function group. When this
parameter is configured to
pid, 2-PID control is set, and when configured to
onof, ON/OFF control is set.
Note: The default is ON/OFF control.
2-PID Control
Controller configured/selected P, I, and D (Proportional, Integral, and
Derivative) control parameters are set by the AT (Auto-Tuning) and ST
(Self-Tuning) parameters, or by manual (user) setup. For manual (user) PID
control, set the PID constants in the Proportional Band (P), Integral Time (I),
and Derivative Time (D) parameters. For more details refer to page 3-30.
ON/OFF Control
In the ON/OFF control method, the control output (MV) is turned ON when
the process value (measured temperature, flow, etc.) is lower than the current
set point, and the control output is turned OFF when the process value is
higher than the current set point. This is known as reverse operation. Direct
operation refers to control where the manipulated variable is increased
according to the increase in the process value. Refer to page 3-25 for more
details.
C 30
200