15. Handy Instruction Design Examples environment (bit2~bit5 of S 3 ＋ 1). 6. Select “slow heating environment” (b2 = 1) if the control duration is too long. 7. Select “fast heating environment” (b4 = 1) if overheating or fluctuations occur. z Adjustment of parameters S 3 and S 3 ＋ 1: Assume parameters S 3 and S 3 ＋ 1 of FTC instruction are set as D12 = K60 (6s), D13 = K8 (b3 = 1) and pulse output cycle time of GPWM instruction is set as D30 = K6000 ( = D12*100), the curve for the control is shown as the below diagram: As shown in the diagram above, we can see that after about 48 minutes, the temperature is able to reach the target temperature with ±1 ℃ accuracy and exceed approx.
10°C of the target temperature. Due to that the temperature once exceeds the target temperature, we modify the heating environment into “fast heating environment”, i.e. D13 = K16 (b4 = 1). The results are shown in the diagram below. From the diagram above, we see that though the temperature no longer exceeds the target DVP-PLC Application Examples 15-20