4. Coarse/fine dosing phase starts
5. If configured and necessary, post-dosing occurs (DR22)
6. The electronic weighing system jumps to the "Stopped" state and waits for the "Next"
command (1141) by the operator
7. If the "Next" command is issued, the dosed weight is written in the log memory and the final
tolerance check is performed.
8. The electronic weighing system jumps to weighing step 0 and waits for further commands.
6.4.2.2 NAWI - Non-automatic weighing instrument - Emptying
In this weighing operating mode, intervention by the operator is always required in the case of
a legal-for-trade verified scale. The operator initiates logging of the current weight with a
command. The operator can initiate the command from the SIMATIC HMI, for example.
"Removal" means that the product to be weighed is dosed from the scale (for example, a silo
on load cells with discharge valves). In this case, the full scale is tared and the net weight
increases with decreasing gross weight.
In NAWI mode, the electronic weighing system also allows a set point to be set, which the
dosing functionality of the electronic weighing system then automatically doses.
The dosing signals "Coarse flow/Fine flow" can be used to directly control the corresponding
dosing elements. After the set point is reached, the electronic weighing system jumps to
"Stopped" state and the operator must confirm the dosed weight using the "Continue weighing"
command. As a result of this, the dosed weight is logged and the weighing operation is
concluded.
In practice, the dosing process may proceed as follows:
1. Scale is filled with sufficient material.
2. PLC sends set point (DR20) and material parameter (DR23) to the electronic weighing
system
3. PLC sends "Start" command (e.g. 1101) to the electronic weighing system
4. The electronic weighing system tares (according to DR25)
5. Coarse/fine dosing phase starts
6. If configured and necessary, post-dosing occurs (DR22)
7. The electronic weighing system jumps to the "Stopped" state and waits for the "Next"
command (1141) by the operator
8. If the "Next" command is issued, the dosed weight is written in the log memory and the final
tolerance check is performed.
9. Emptying signal is set, if necessary (according to DR25) (weighing step 5)
10.The electronic weighing system jumps to weighing step 0 and waits for further commands.
Parameter assignment/addressing
6.4 Operating modes
Technology module TM SIWAREX WP351 HF
54 Operating Instructions, 01/2020, A5E47521010-AA
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