ABB ACQ580, Firmware Manual

Page: 258 / 422

254 Parameters
58.107 Data I/O 7 Parameter selector for Modbus register address 400007.
For the selections, see parameter
58.101 Data I/O 1 .
None
… … … …
58.114 Data I/O 14 Parameter selector for Modbus register address 400014.
For the selections, see parameter
58.101 Data I/O 1 .
None
71
71 External PID1 Configuration of external PID.
See the control chain diagrams on pages
415 and 416 .
71.01 External PID act
value See parameter 40.01 Process PID output actual . -
71.02 Feedback act value See parameter 40.02 Process PID feedback actual . -
71.03 Setpoint act value See parameter 40.03 Process PID setpoint actual . -
71.04 Deviation act value See parameter 40.04 Process PID deviation actual . -
71.06 PID status word Displays status information on process external PID control.
This parameter is read-only. -
0000h…FFFFh Process PID control status word. 1 = 1
71.07 PID operation mode See parameter 40.07 Process PID operation mode . Off
71.08 Feedback 1 source See parameter 40.08 Set 1 feedback 1 source . AI2 percent
71.11 Feedback filter time See parameter 40.11 Set 1 feedback filter time . 0.000 s
71.14 Setpoint scaling Defines, together with parameter 71.15 Output scaling , a
general scaling factor for the external PID control chain. The
scaling can be utilized when, for example, the process
setpoint is input in Hz, and the output of the PID controller is
used as an rpm value in speed control. In this case, this
parameter might be set to 50, and parameter
71.15 to the
nominal motor speed at 50 Hz.
In effect, the output of the PID controller [
71.15 ] when
deviation (setpoint - feedback) = [ 71.14 ] and [ 71.32 ] = 1.
Note: The scaling is based on the ratio between 71.14 and
71.15 . For example, the values 50 and 1500 would produce
the same scaling as 1 and 3.
100.00
-200000.00…
200000.0 Process setpoint base. 1 = 1
71.15 Output scaling See parameter 71.14 Setpoint scaling . 100.00
No. Name/Value Description Def/FbEq16
Bit Name Value
0 PID active 1 = Process PID control active.
1 Reserved
2 Output frozen 1 = Process PID controller output frozen. Bit is set if parameter
71.38 Output freeze enable is TRUE, or the deadband function is
active (bit 9 is set).
3…6 Reserved
7 Output limit high 1 = PID output is being limited by par.
71.37
.
8 Output limit low 1 = PID output is being limited by par. 71.36 .
9 Deadband active 1 = Deadband is active.
10…11 Reserved
12
Internal setpoint
active 1 = Internal setpoint active (see par. 71.16 … 71.23 )
13…15 Reserved