The following messages are displayed in the status word:
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Bit
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Description
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Bit 4 = 1
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The following behavior is displayed:
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The SP input lies outside the area [pv_inf, pv_sup]: for calculation the function block requires the values pv_inf or pv_sup.
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One of the kp, dband, gain _kp parameters outrate is negative. the function block uses the value 0 outside the incorrect parameter value.
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kd < 1 (with td <> 0) : the function block uses the value 1 instead of the faulty value of kd.
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The parameter ovs_att is outside the [0.1] range: for calculation, the function block uses the value 0 or 1.
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One of the parameters out_min or out_max is outside the range [out_inf, out_sup]. For calculation, the function block uses the value out_inf or out_sup.
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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).
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Bit 5 = 1
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The output OUT has reached the lower threshold out_min (see Note) |
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Bit 6 = 1
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The output OUT has reached the upper threshold out_max (see Note) |
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Bit 7 = 1
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The thresholds pv_inf and pv_sup are identical.
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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
Common Floating Point Errors.
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.
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 block error codes and values, see
Controller.
In the following cases a warning message is given:
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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.
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kd < 1 (with td <> 0): the function block uses the value 1 instead of the faulty value of kd.
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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).
