Issue
PIDFF is not producing an output due to status 080.

Product Line
Control Expert, Unity Pro

Resolution
Status 080 DEC = 0101 0000 which means that bits 4 and 6 are set. Bits are numbered 0-7 starting from the far right.
See below what this means. Bit 4 will be set if any one of bulleted items is true.


Note on output OUT

NOTE: In manual mode these bits stay at 1 for only one program cycle. When the user enters a value for OUT which exceeds one of the thresholds, the function block sets the Bit 5 or 6 to 1 and blocks them from the user entered value. During the next execution of the function block, the value of OUT no longer lies outside the range and bits 5 and 6 are set to zero again.

Error message

An error is displayed when a non-floating point has been recorded at an input, when a problem occurs during a calculation with floating points or when the thresholds pv_inf and pv_sup of the controller are identical. In this case the outputs OUT, OUTD, MA_O and INFO remain unchanged.
NOTE: For a list of all PIDFF block error codes and values, see below:

PIDFF	W_WARN_OUT_OF_RANGE	T	30110	16#759E	Parameter out of range
PIDFF	E_ERR_NULL_INPUT_SCALE	F	-30121	16#8A57	Null input scale: max and min limit must be different
PIDFF	FP_ERROR	F	-	-	See table of Common Floating Point Errors below
PIDFF	Status word values	T/F	-	-	For details about the PIDFF status word see above the 4 bit details

Warning Message

In the following cases a warning message is given:

• One of the kp, dband, gain _kp parameters outrate is negative. The function block then uses the value 0 instead of the incorrect parameter value.
• kd < 1 (with td <> 0): the function block uses the value 1 instead of the faulty value of kd.
• The parameter ovs_att is outside the [0.1] range: for calculation, the function block uses the value 0 or 1.
• The parameter out_min or out_max is outside the range [out_inf, out_sup]. For calculations, the function block uses the value out_inf or out_sup.
• One of the parameters outbias, otff_inf or otff_sup is outside the range [(out_min - out_max), (out_max - out_min)]. For calculation, the function block uses the value (out_min - out_max) or (out_max - out_min).

If an error occurs during floating point processing, it will also be displayed on the Statusoutput. For the list of possible floating point error codes, see below.

The following table shows the common error codes and error values created for floating point errors. These error information are displayed in the Diagnostic Viewer and the error code values are written in %SW125.

Table of common floating point errors

Error codes	Error value in Dec	Error value in Hex	Error description
FP_ERROR	-30150	16#8A3A	Base value (not apearing as an error value)
E_FP_STATUS_FAILED_IE	-30151	16#8A39	Illegal floating point operation
E_FP_STATUS_FAILED_DE	-30152	16#8A38	Operand is denormalized - not a valid REAL number
E_FP_STATUS_FAILED_ZE	-30154	16#8A36	Illegal divide by zero
E_FP_STATUS_FAILED

Released for:Schneider Electric USA