IDEC MicroSmart Pentra - Manual (Page 96)

C ONFIGURING PID M ODULE USING W IND LDR
F C5A MicroSmart PID Module User’s Manual FC9Y-B1283 6-31
(4) Control Register+178: External SP Input Linear Conversion Maximum Value
Configure the linear conversion maximum value for the external SP input. When input type is current (4 to
20mA DC or 0 to 20mA DC), configure the value corresponding to 20mA for input CH1. When input type is
voltage (0 to 1V DC or 1 to 5V DC), configure the value corresponding to 1V or 5V for input CH1.
Example: When input type is current (4 to 20mA DC), if the external SP input linear conversion maximum value
is 1000°C, external SP input 20mA corresponds to the set point (SP) 1000°C for CH0 control. When input type
is voltage (0 to 1V DC), if external SP input linear conversion maximum value is 1200°C, external SP input 1V
corresponds to the set point (SP) 1200°C for CH0 control.
(5) Control Register+179: External SP Input Linear Conversion Minimum Value
Configure the linear conversion minimum value for the external SP input. When input type is current (4 to
20mA DC or 0 to 20mA DC), configure the value corresponding to 4mA or 0mA for input CH1. When input type
is voltage (0 to 1V DC or 1 to 5V DC), configure the value corresponding to 0V or 1V for input CH1.
Example: When input type is current (4 to 20mA DC), if external SP input linear conversion minimum value is
0°C, external SP input 4mA corresponds to the set point (SP) 0°C for CH0 control. When input type is voltage
(0 to 1V DC), if external SP input linear conversion maximum value is set to -20°C, external SP input 0V
corresponds to the set point (SP) -20°C for CH0 control.
(6) Control Register+177: External SP Input Bias
The external SP input bias is added to the set point (SP) obtained after the linear conversion for the external
SP input. The set point (SP) is then used as the set point (SP) for CH0 control.
Examples:
When the input type is current (4 to 20mA DC), the linear conversion maximum value is 1000°C, the linear
conversion minimum value is 0°C, and the external SP input bias is 50°C, the set point (SP) of CH0 control
corresponding to 12mA of external SP input will be 550°C.
When the input type is voltage (0 to 1V DC), the linear conversion maximum value is 1000°C, the linear
conversion minimum value is 0°C, and the external SP input bias is 50°C, the set point (SP) of CH0 control
corresponding to 0.5V of external SP input will be 550°C.