Delta DVP02LC-SL, Руководство по эксплуатации

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Load Cell Module DVP02LC-SL
DVP-PLC Operation Manual
17
5.3 Further Explanations on Each Function
5.3.1 Measure the Weight
Normally, we can choose to measure the net weight or gross weight of an object. The net weight means
the weight of the product itself, that is, the actual weight of the product without its external packaging.
The weight of the packaging is called the tare weight. The gross weight is the total weight, namely the
net weight plus the tare weight.
y
Tare weight: Weight of the packaging
y
Net weight: The weight of the product, excluding the packaging.
y
Gross weight: The net weight plus the tare of the product.
y
Gross weight = net tare weight
Example: A product weighs 10kg and the carton contains it weighs 0.2kg, then its gross weight is
10.2kg. (net weight = 10kg, tare weight = 0.2kg, gross weight = 10.2kg)
Relevant control registers
y
CR#6: Reads the tare weight
y
CR#7: Selects gross or net weight
y
CR#8, 9: The tare weight
Example
Use the measured value at CH1 as the net weight and disable CH2. If you know the weight of the
packaging already, you can skip the step of reading the tare weight.
1. Read the tare weight
Step 1: Write H’0000 into CR#7.
Step 2: Place the packaging on the CH1 load cell.
Step 3: Write H’0001 into CR#6 to take the weight of the packaging as the tare weight.
2. Set CR#7 = H’00F1.
5.3.2 Standstill Check
When an object is placed on the load cell to measure its weight, you can use the standstill check to
know that the measured value has been stable.
y
If the measured value shifts within the range for standstill check (CR#18, 19) set up by the
user, bit4 and bit5 of CR#50 will be set to “1”.
y
If the measured value shifts beyond the range for standstill check set up by the user, bit4 and
bit5 of CR#50 will be set to “0”. They will be set to “1” again when the range is returned to the
set range.
Example: The measuring time is 10ms, the times of standstill check is 10, and the range for standstill
check is 1,000. When the range for standstill check exceeds 1,000, the measured value will be
regarded unstable, i.e. bit4 and bit5 of CR#50 will be set to 0. When the measuring time is within