Siemens SIMATIC BATCH Operating Manual page 370

BATCH Control Center
9.6 Batch Planning
If the nominal value is outside of the values of the limits calculated in tooltip then a warning is
issued on release of the recipe even although it is within the nominal value limits.
Example 2
Recipe header
Reference quantity
Minimum quantity
Maximum quantity
Unit
Lower limit of nominal value
Upper limit of nominal value
Setpoint
Amount of mix = 1000kg
As the amount of the mix is identical to the standard mix then no adjustment is made. A single
dosage has a total volume of 250 Kg in the container. The batch is plausible and is released.
Amount of mix = 5,000kg
As the mixed volume is 5 times greater than the standard mix, the nominal value is adjusted
in case of linear adjustment from 250kg to 1250kg. here, the upper limit of 1500 Kg for single
dosages is not exceeded - the batch is released.
Amount of mix = 6,000kg
As the mixed volume is 6 times greater than the standard mix, the nominal value is adjusted
in case of linear adjustment from 250kg to 1,500kg. Here, there are 4 single dosages of 1500kg
resulting in a total volume of 6000kg in the container. There is an overdosage of 1000kg in the
container although the single dosage volumes are within the limits of the single steps. However,
as the system only checks the limits of the single dosages, but does not permit the standard
mix to be exceeded or fallen below, the batch is plausible and is released.
Remedy
The incorrect behavior of this batch can be prevented by making a change to the configuration
at the upper limit of the single step from 1500 Kg to 1250 kg. Engineering and the creator(s)
of the recipe must work together on this. Please carry out the test runs.
370
REF 1000 liter
Recipe
LL 100 liter
Recipe
HL 5000 liter
Recipe
Unit_A
LL 100 liter
SP
HL 1500 liter
SP
SP 250 liter
Operating Manual, 02/2016, A5E35958174-AA
SIMATIC BATCH V8.2