IDEC MicroSmart Pentra - Manual (Page 87)

C ONFIGURING PID M ODULE USING W IND LDR
6-22 FC5A MicroSmart PID Module User’s Manual FC9Y-B1283
(2) Control Register+133: Input CH1 Function
Control Register+55: External SP Input
The one of the following input functions can be selected as the Input CH1 Function.
Input CH1:
Input CH1 is used as the process variable (PV) for CH1 control.
Difference (CH0-CH1):
The difference between input CH0 and input CH1 is used as the process variable (PV) for CH1 control.
Process variable (PV) of CH1 control = Input CH0 input value - Input CH1 input value
Difference (CH1-CH0):
The difference between input CH1 and input CH0 is used as the process variable (PV) for CH1 control.
Process variable (PV) of CH1 control = Input CH1 input value - Input CH0 input value
Addition (CH0+CH1):
The addition of input CH0 and input CH1 is used as the process variable (PV) for CH1 control.
Process variable (PV) of CH1 control = Input CH0 input value + Input CH1 input value
External SP Input:
Input CH1 is used as the set point (SP) for CH0 control.
When the external SP input bias is configured, the external SP input bias is added to the input CH1 value, and
then the input CH1 value is used as the set point (SP) for CH0 control. One of the analog input types shown in
the table blow can be selected for the external SP input.
Current Voltage
Input Type 4 to 20mA DC or 0 to 20mA DC 1 to 5V DC or 0 to 1V DC
Allowable Input 50mA DC maximum
0 to 1V DC: 5V DC maximum
1 to 5V DC: 10V DC maximum
Input Impedance 50Ω 100kΩ
Cascade Control:
The cascade control is an advanced control that uses 2 inputs [CH1 as a master (primary control) and CH0 as
a slave (secondary control)] to control a single process.
Master (CH1) calculates the output manipulated variable (MV) according to the process variable (PV) and the
set point (SP). The output manipulated variable (MV) of the master (CH1) is used as the set point (SP) of the
slave (CH0). With the obtained set point (SP), the slave (CH0) calculates the output manipulated variable (MV)
and controls the output CH0.