Saia-Burgess Controls AG
Manual for PCD2|3.W7x0
│ Document 26-
833 E
NG07 │ 2018-10-18
Configuration
3
3-4
Operation:
Acquisition cycles with
a small time constant
Time window
250 ms
T
(Time observed)
Change of weight in the time observed
T
Stability of the scale
Noise (WM_Status)
The instability of the weighing system can be read with a positive signal edge
at the
Noise
input to the FBox
WM_Status
. The instability is dependent on the
noise behaviour of the acquisition system, the vibration of the scale base and
the addition of the item to be weighed. In the next program cycle, a value for this
instability will appear at the
Noise
output. The range of values is from 0 to 255.
One unit represents 2
-18
of the nominal loading of the cell.
Reading the overload on the weighing cell
ReadO (WM_Config)
This input is used to read off the maximum overload ever reached on the
weighing cells. Most commercially available weighing cells are guaranteed to
withstand overloading up to 150% of their nominal load without damage. But it it
quite common, especially with small weighing cells, for them to be more heavily
overloaded.
The overload read off may range from 110% to 390%. The cell overload is
permanently stored in the weighing module and is overwritten each time a heavier
load is detected.
Clearing the overload memory
ClearO (WM_Config)
This input resets the permanent memory storing the overload value to 0. It is used
when initialising a new module, or in service where e.g. a defective weighing cell is
replaced.
Reading the status of the scale
Status (WM_Status)
The readout of the status of the scale is triggered by a positive signal edge at the
Status
input to the FBox
WM_Status
. When this FBox is activated, the data traf
-
fic between the weighing module and the Saia PCD
®
CPU is also checked. If this
data traffic is no longer assured, the
LifeFlag
on the
WM_Master
Box is set to “1”.
• 1 sec.
Differential weight =
