13
PW20i
HBM
A1269-2.0 en/de/fr
5.4
Limit value functions
Four limit values are available in the PW20i, which are set via the LIV
command. The status of the limit value functions can be read from the
measurement status (MSV? or RIO?). You can choose between the gross
value, the net value, the trigger result or the MIN/MAX extreme values as the
input signal for limit value monitoring. The input mode has to be set to IMD0/1.
As this load cell does not have any digital outputs, the external Master control
must make digital I/Os available. The PW20i generates the information to
control these digital outputs in the respective measurement statuses
(MSV-measurement status, RIO). The Master control then only needs to
forward these control bits to its digital outputs, in order to drive the limit switch
outputs.
For more detailed information, please see the help file, Limit value function.
5.5
Extreme value functions
The PW20i includes an extreme value function that can monitor either gross or
net measured values. Output of the two extreme values (MIN and MAX) is
implemented by the PVA command. The CPV command can be used at any
time to clear the extreme values. The command PVS is used for activation.
For more detailed information, please see the help file, Extreme value function.
5.6
Dosing and filling control
The PW20i includes dosing control. As this load cell does not have any digital
outputs, the external Master control must make digital I/Os available. The
PW20i generates the information to control these digital outputs in the
respective measurement statuses (MSV − measurement status, RIO). The
Master control then only needs to forward these control bits to its digital
outputs, in order to drive the dosing control valves.
The PW20i contains 32 parameter sets that are held in the EEPROM. The
RDP command is used to select them. Dosing parameters can be changed
while dosing is ongoing.
The filling and dosing function is activated via the command IMD2;.
In this case, the settings of the limit value function and the trigger function have
no significance.
The dosing function can be found in the help file; Commands for dosing
control.
