Parameter Declaration Data Type Description
MTR_TM INPUT TIME MOTOR MANIPULATED VALUE
n The time required by the actuator to move from
limit stop to limit stop is entered at the MTR_TM
parameter.
n Default: T#30s
n Range of Values: ³ CYCLE
DISV INPUT REAL DISTURBANCE VARIABLE
n For feed forward control, the disturbance variable is
connected to input DISV.
n Default: 0.0
n Range of Values: -100.0...100. 0 (%) or phys.
value
2
QLMNUP OUTPUT BOOL MANIPULATED SIGNAL UP
n If the output QLMNUP is set, the actuating valve is
opened.
n Default: FALSE
QLMNDN OUTPUT BOOL MANIPULATED SIGNAL DOWN
n If the output QLMNDN is set, the actuating valve is
opened.
n Default: FALSE
PV OUTPUT REAL PROCESS VARIABLE
n The effective process variable is output at the PV
output.
n Default: 0.0
ER OUTPUT REAL ERROR SIGNAL
n The effective error is output at the ER output.
n Default: 0.0
1) Parameters in the setpoint and process variable branches with the same unit
2) Parameters in the manipulated value branch with the same unit
You can use the controller as a PI fixed setpoint controller or in secondary control loops in
cascade, blending or ratio controllers, however not as the primary controller. The func-
tions of the controller are based on the PI control algorithm of the sampling controller sup-
plemented by the functions for generating the binary output signal from the analog
actuating signal.
Apart from the functions in the process value branch, the FB implements a complete PI
controller with a digital manipulated value output and the option of influencing the manip-
ulated value manually. The step controller operates without a position feedback signal.
The setpoint is entered in floating-point format at the SP_INT input.
The process variable can be input in the peripheral (I/O) or floating-point format. The
CRP_IN function converts the PV_PER peripheral value to a floating-point format of -100
to +100 % according to the following formula:
Application
Setpoint Branch
Process Variable Branch
VIPA SPEED7
Standard
PID Control > FB 42 - CONT_S - Step Control
HB00 | OPL_SP7 | Operation list | en | 18-30 844
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