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CTH200 Series PLC User Manual

251

Filter can smooth the weighing value and resist disturbance. The last weight is an average of n

measurements; 50Hz sample frequency means weigh every 20 ms. For example, filter depth

n=10 represents taking 10 measurements for average value and recalculate every 20ms.

If the interfering frequency integral multiple of “1/(filter depth * 20 ms)”, then the average filter will

realize brilliant damping of cycle disturbance.

3. Weight_Default

Call it by SM0.0, set Mode 1 for second calibration. The parameter will automatically assign

value when using 231-7WA module for first time with loading factory setting. Refer to instruction

explanation before for details.

 Mode explanation

Weighing module SM231-7WA offers 2 usages by configure parameter in “Mode" of

"Weight_Default' to select basic mode or expansion mode.

1) Basic mode (Mode=0)

(1) Call “Weight_Config”, "Weight_Init" and "Weight_Default";

(2) Supported following functions:

• Set sensor sensitivity, low pass cutoff frequency and filter depth;

• Load factory parameter;

• Set maximum weighing range;

• Set zero;

• First calibration;

• Measure tare;

• Delete tare;

• Read sampling value both before and after filtering;

• Power-down alarm, line broke alarm, outrange alarm and set zero etc.

2) Expansion mode (Mode=1)

(1) Call "Weight_Config", "Weight_Init", "Weight_Default" and "Weight_Extend";

(2) Support following functions:

• Supported all functions in basic mode;

• Set minimum weighing range;

• Second calibration;

• Preset tare;

• Set Digital phase (set minimum range scale, show in 1×10

, 2×10

or 5×10

)

• Ensure pause status (set pause status when setting zero and tare)

• Newly added status: Max+9e (GB/T 7724-2008), Preseted tare, 1/4d (GB/T 23111-2008), pause,

low weight;

COTRUST CTH200 Series User Manual

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