Watlow PPC-2000 - Manual (Page 208)

Chapter 5: LogicPro and Modbus Reference PPC-2000 User’s Guide
182 Watlow Anafaze Doc.# 30002-00 Rev 2.3
Setpoint Source
This parameter determines how the setpoint for the channel is
set. Select User for normal closed-loop control applications.
Select a channel output (Channel # Out) for cascade control.
Select an analog input for ratio control, differential control,
remote setpoint, or process variable retransmit. A value of 0
indicates a user set setpoint. See Table 5.13 on page 176
through Table 5.17 on page 179 for values to select a channel
output or analog input as the source of the setpoint value.
Setpoint Ratio
For ratio control, differential control, and remote setpoint
applications, set the ratio by which the analog input value
selected as the Setpoint Source is multiplied to calculate the
setpoint. (See Ratio Control on page 109, Differential Control
on page 112, and Remote Set Point on page 112.) This
parameter may be set to any value from -30000 to 30000
corresponding to a range of -300.00 to 300.00.
Setpoint Offset
For ratio control, differential control, and remote setpoint
applications set the offset which is added to the product of the
analog input value selected as the Setpoint Source and the
Setpoint Ratio to calculate the setpoint. (Ratio Control on page
109,Differential Control on page 112, and Remote Set Point on
page 112.)
This parameter may be set to any value from -32768 to 32767
The number of decimal places depends on the Input Type
selected. See Table 3.15 on page 130.
Maximum Setpoint
This parameter determines the maximum value the PPC will
accept for the setpoint of the channel. This parameter is also
used to scale a cascade channel. (See Cascade Control on page
105). The range is the same as that of the input type for the
channel.
Minimum Setpoint
This parameter determines the minimum value the PPC will
accept for the setpoint of the channel. This parameter is also
used to scale a cascade channel. (See Cascade Control on page
105). The range is the same as that of the input type for the
channel.
Heat/Cool Output Type
This parameter specifies the type of output signal and
determines whether the PID or on/off control algorithm is used
for the channel. See Table 5.20 on page 183. For specific
information on control terminology and definitions, refer to
Chapter 6, Control Terminology.