Rockwell Automation Allen-Bradley Micro830 Original Instructions

Rockwell Automation Publication 2080-UM002L-EN-E - November 2021 275
Appendix F PID Function Blocks
Gains Input PID_GAINS
Gains of PID for controller.
Use the PID_GAINS data type to configure the Gains parameter.
Control Input BOOL
Control direction of the process:
TRUE = Direct acting, such as Cooling.
FALSE = Reverse acting, such as Heating.
Llnit Input BOOL Reserved for future use.
Active Output BOOL
Status of the PID controller:
TRUE = PID state is running.
FALSE = PID state is stopped.
CV Output REAL
The control value output.
If any error occurred, CV is 0.
AbsoluteError Output REAL
Absolute error is the difference between process value (PV) and
setpoint (SV) value.
Error Output BOOL
Indicates the existence of an error condition.
TRUE = PID has an error.
FALSE = PID has no errors.
ErrorID Output USINT
A unique numeric that identifies the error. The errors are
defined in PID error codes.
Table 59 - GAIN_PID Data Type
Parameter
Parameter
Type
Data Type Description
Kc Input REAL
Controller gain for PID.
Proportional and Integral are dependent on this gain (>=
0.0001).
Increasing Kc improves response time but also increases
overshoot and oscillation of the PID.
If Kc is invalid, an error occurs.
Ti Input REAL
Time integral constant in seconds (>= 0.0001).
Increasing Ti decreases overshoot and oscillation of the PID.
If Ti is invalid, an error occurs.
Td Input REAL
Time derivative constant in seconds (>= 0.0).
When Td equals 0, then there is no derivative action and PID
becomes a PI controller.
Increasing Td reduces the overshot and removes the oscillation
of the PID controller.
If Td is invalid, an error occurs.
FC Input REAL
Filter constant (>= 0.0).
Recommended range for FC is 0...20.
Increasing FC smooths the response of the PID controller.
If FC is invalid, an error occurs.
Table 60 - PID Error Codes
Error Code Description
0 PID is working normally.
1 Kc is invalid.
2 Ti is invalid.
3 Td is invalid.
4 FC is invalid.
Table 58 - PID Arguments (Continued)
Parameter
Parameter
Type
Data Type Description

Rockwell Automation Allen-Bradley Micro830 Specifications

General

Brand	Rockwell Automation
Model	Allen-Bradley Micro830
Category	Controller
Language	English