Chapter 4 Installation and Wiring
4-11
3. Maximum rated load
When selecting a load cell module, you need to check its specifications, such as the maximum rated load, tares,
vibrations, shocks and so on. The closer the on a load cell sensor is to the maximum rated load specified for the load
cell sensor, the more accurate the measurement is.
4. Four-Wire or Six-Wire
You can use 4-wire or 6-wire method for wiring a load cell sensor. Select the 4-wire method when the distance of the
connected terminal between a module and a sensor is smaller or select the 6-wire method when the distance of the
connected terminal between a module and a sensor is larger. A load cell module provides power (excitation voltage
EXC+/EXC-) to a load cell sensor. When there is impedance between a load cell module and a sensor, the excitation
voltage that a sensor received is usually less than the excitation voltage that a module sent. The output signal
SIG+/SIG- and the excitation voltage EXC+/EXC- are related; if the distance between a module and a sensor is
smaller, the impedance between the module and the sensor is also lesser.
5. Precision
The precision of a load cell module is the result of the maximum rated load multiples 0.01%. The precision of the load
cell module is 0.01%. But lots of factors can affect the precision; for instance if the differential error is too big or the
precision is too low or the influences of vibrations or shocks occur in the environment, and then the precision 0.01% is
hard to maintain. You can set the mode to a longer response time mode to have a more stable weight value and thus
increase the precision. Refer to section 3.1.1 for more details on the response time modes. When selecting a load cell
module, you can check the specifications of the response time mode and the precision to see if they meet your
requirements.
4.2.9 Definitions of RS-485 Ports
TP70P-211LC1T
Pin
-for PLC mode
-for TP mode
5 GND GND
6 D+ N/C
7 D- N/C
8 N/C D+
9 N/C D-
To Next Page
Loading...
Need help?
General
