Filling Goods - Siemens SIMATIC S7-1200 Manual

3 Basics

3.3 Filling goods

3.3 Filling goods
Table 3-3
No.
1. Once the product to be packaged is selected
via the recipe data record, the setpoint weight
is calculated in the CPU and filling is started
via the digital control of the two sliders.
During the filling process the actual weight is
compared with the setpoint weight, with the
help of the load cell and the weighing module.
When a specified threshold has been reached
(e.g. 90% of the setpoint weight), the filling
speed is reduced via the slider control. When
the setpoint has been reached, the sliders are
closed.
2. After filling, the filled weight is evaluated for
quality assurance. The weight value for a
positive evaluation has be within the following
limits:

Setpoint weight + resolution of the load
cell

Setpoint weight + resolution of the load
cell + tolerance
If the real weight value of the product is in the
tolerance range of the requirements, the
quality of the current product is assessed as
good.
Underfilling is therefore not possible.
3. Each filled product is counted. The continuous
numbering, for example, can be linked with the
product via a labeling machine. This is how the
product (e.g. via barcode scanner) can be
tracked. The product can later also be clearly
identified in the log data via this ID.
4. After completing the quality assurance, the
result of the quality assurance is assigned to
the product ID.
Weighing, Controlling and Logging (Set 6)
Entry ID: 82454336, V2.0,
Function
10/2017
Comment
0,4
Digital control
Selection
of recipe
data set
(a) Setpoint weight: e.g. 200 g
(b) Resolution:
(c) Tolerance:
(d) Real weight:
a+b
205
200,2
195 200 205
Tolerance range (good quality)
uality status:
Q

0 (poor)

1 (good)
0,2 g
+ 10 g
205 g
d
a+b+c=210,2
g
210 215
?
205 g
14